Smartwatches / Compare

Apple Watch SE 2 vs Fitbit Sense 2

A

Product A: Apple

Watch SE 2

97 of 150 known

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B

Product B: Fitbit

Sense 2

105 of 150 known

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Every value links to where we found it.

Only differences

AApple Watch SE 2

BFitbit Sense 2

General

7 of 10 differ

Series

Apple Watch SE1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Sense4Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Fitbit names the product Sense 2 in its Sense line and calls it its most advanced health-focused smartwatch.

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

A2722, A2723, A2726, A2727, A2725, A2724, A2855, A28562Maker product pagesupport.apple.com/en-us/108056Read 10 October 2026GPS: 40mm A2722, 44mm A2723. GPS + Cellular 40mm: A2726 North America, A2725 Europe and Asia Pacific, A2855 China mainland. 44mm: A2727 North America, A2724 Europe and Asia Pacific, A2856 China mainland.

FB521, FB521BKGB-US, FB521SRWT-US, FB521GLBM-US1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Regulatory notices name Model FB521 with FCC ID XRAFB521. The retail colour model numbers come from the Abt listings.19Retailer pageabt.com/Fitbit-Sense-2-Graphite-Aluminum-Shadow-Grey-Strap-Advanced-Health-Fitness-Smartwatch-24mm-FB521BKGBUS/p/182315.htmlRead 23 October 2026Abt lists manufacturer model FB521BKGB-US. FB521SRWT-US and FB521GLBM-US are on the sister Abt listings. FB521 is the model in the manual.

GTIN / EAN

Not available

810073611429, 810073611443, 81007361143619Retailer pageabt.com/Fitbit-Sense-2-Graphite-Aluminum-Shadow-Grey-Strap-Advanced-Health-Fitness-Smartwatch-24mm-FB521BKGBUS/p/182315.htmlRead 23 October 2026Abt lists FB521BKGB-US with UPC 810073611429 (Graphite Aluminum with Shadow Grey band).

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

7 September 20223Press releaseapple.com/newsroom/2022/09/apple-reveals-apple-watch-series-8-and-the-new-apple-watch-seRead 10 October 2026Release dated September 7, 2022.

24 August 20224Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Blog post dated Aug 24, 2022. Pre-orders started that day with worldwide availability that fall.

Status

Discontinued8Press articlewccftech.com/apple-discontinues-three-older-apple-watch-models-as-se-3-series-11-and-ultra-3-take-the-spotlight/ampRead 10 October 2026Dated September 9, 2025. Apple discontinued the SE 2 after the SE 3 launch and removed it from sale. A second report (appleosophy.com, September 11, 2025) says the SE 2 is no longer in production.

Available2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026The Google Store sells Sense 2 at 249.95 USD on the access date. That is a current price, not the launch price.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Apple Watch SE 37Press releaseapple.com/newsroom/2025/09/apple-introduces-apple-watch-se-3Read 10 October 2026Apple introduced the next generation of Apple Watch SE with the Apple Watch SE 3.31Reviewtomsguide.com/wellness/smartwatches/apple-watch-se-3-unveiled-cost-release-date-key-features-battery-and-moreRead 23 October 2026Tom's Guide says Apple left the SE alone since 2022 and calls the SE 3 the refreshed Apple Watch SE (3rd generation) after the SE (2nd gen).

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$2493Press releaseapple.com/newsroom/2022/09/apple-reveals-apple-watch-series-8-and-the-new-apple-watch-seRead 10 October 2026Apple Watch SE starts at $249 (US). The release does not list per-configuration prices, so only the starting price is stored on the 40mm GPS model.

$299.954Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Versa 4 is available for $229.95 and Sense 2 is available for $299.95 (USD). US prices exclude sales tax.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€2994Press releaseapple.com/de/newsroom/2022/09/apple-reveals-apple-watch-series-8-and-the-new-apple-watch-seRead 10 October 2026German release: Apple Watch SE ab 299 Euro inkl. MwSt. Starting price, applied to the 40mm GPS model.

€299.9514Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026UVP 299,95 EUR, marketed from September 2022.15Press articlepcwelt.de/article/1206707/fitbit-sense-2-vorgestellt-hier-finden-sie-alle-infos.htmlRead 23 October 2026PC-Welt (Germany) at the launch: Die Fitbit Sense 2 kostet 299,95 Euro. German prices include VAT. Tech Advisor states EUR 299.95, GBP 269.99 and USD 299.95.

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

AU, CA, FR, DE, IN, JP, AE, GB, US3Press releaseapple.com/newsroom/2022/09/apple-reveals-apple-watch-series-8-and-the-new-apple-watch-seRead 10 October 2026Customers in Australia, Canada, France, Germany, India, Japan, the UAE, the UK, the US and more than 40 other countries and regions could order at launch. Only the named countries are stored.

US, GB, DE, AU2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026US, GB, DE and AU Google Stores offer the model with a Buy button. Current prices are not launch prices.

ColoursiThe maker's own colour names

Midnight, Starlight, Silver2Maker product pagesupport.apple.com/en-us/108056Read 10 October 2026Midnight, Starlight or Silver aluminum.

Shadow Grey / Graphite Aluminum, Lunar White / Platinum Aluminum, Blue Mist / Soft Gold Aluminum2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Colors: Shadow Grey / Graphite Aluminum, Lunar White / Platinum Aluminum, Blue Mist / Soft Gold Aluminum.

Segment

Smartwatch3Press releaseapple.com/newsroom/2022/09/apple-reveals-apple-watch-series-8-and-the-new-apple-watch-seRead 10 October 2026Presented as one of the two best-selling smartwatches, the lower-priced Apple Watch.

Smartwatch2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Page title: Fitbit Sense 2 Smartwatch. The Aug 24, 2022 Fitbit blog calls it a health-focused smartwatch.

OS updates promisediYears of explicitly promised OS updates. A security-only support period does not establish an OS-upgrade promise.

Not available

Not available

Security updates untiliExact end date published for security-update support of this model. Do not calculate it from a stated number of years. A security-only period does not promise OS upgrades.

Not available

Not available

Case

4 of 8 differ

Case sizeiMarketed case-size options. The marketed size can differ from physical case height, such as ceramic editions. Base dimensions describe the smallest base-material case.

40mm1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Not available

Case shape

Rectangular2Maker product pagesupport.apple.com/en-us/108056Read 10 October 2026Apple Watch cases are rounded rectangles. Case sizes are not screen diagonals.

Rectangular14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Gehäuseform: eckig (square).

Case materialiMaterial of the housing body, not just the bezel. Use Mixed when the maker describes a mixture of housing/frame materials. Read the published-material field for the parts and proportions.

Aluminium1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Aluminium1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Materials: the housing and buckle on Sense 2 are made of aluminum.14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Gehäusematerial: Aluminium.

Case material (as published)

Aluminum1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Aluminum1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Materials: the housing is aluminum. The store names the finishes Graphite, Platinum and Soft Gold Aluminum.

BackiMaterial of the back of the smallest base-material case. Other materials or regional editions can differ. See source notes.

Molded nylon composite2Maker product pagesupport.apple.com/en-us/108056Read 10 October 2026Ion-X glass, Retina display and molded nylon composite back.

Not available

Case dimensionsiPhysical case height, width and thickness. The source note states exclusions such as the heart-rate sensor protrusion.

Height40Width34Thickness10.7mm(1.6 × 1.3 × 0.4 in)1Maker product pagesupport.apple.com/en-us/111853Read 10 October 202640mm: height 40, width 34, depth 10.7 mm. 44mm: height 44, width 38, depth 10.7 mm.

Height40.5Width40.5Thickness11.2mm(1.6 × 1.6 × 0.4 in)2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Dimensions and weight: length 40.5 mm, width 40.5 mm, height 11.2 mm. The page states no sensor exclusion. The same page states weight 37.64 g without saying whether the band is included, so no weight is stored.

Weight (case only)iWatch body without a strap. An unqualified published weight must not be assumed to exclude the strap.

26.4g(0.9 oz)1Maker product pagesupport.apple.com/en-us/111853Read 10 October 202640mm: 26.4 g GPS and 27.8 g GPS + Cellular. 44mm: 32.9 g GPS and 33 g GPS + Cellular. Apple lists weight by case size and radio, not by band.

Not available

Weight with strapiWatch with the stated strap attached. Strap material and case size belong in the source note. Reviewer measurements belong in measured fields.

Not available

Not available

Durability

3 of 8 differ

Water resistanceiStatic water-pressure rating in atmospheres. It is not a safe swimming or diving depth. Diving limits are listed separately.

5ATM1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Water resistance 50m (swimproof). Footnote 6: 50 meters under ISO standard 22810:2010 for shallow-water use. Not for scuba diving.

5ATM2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Water resistance: water resistant to 50 m. The Google compare page states 5 ATM.9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026Maker comparison, Water and dust resistance row: Sense 2 5 ATM.

Water resistance standard

ISO 22810:20101Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

IEC 605291Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026IP Rating, printed page 78: Model FB521 has a water resistance rating of IPX8 under IEC 60529, up to a depth of 50 meters. IEC 60529 covers ingress, so no ISO pressure standard is inferred.

Dust and water rating

Not available

IP6X, IPX81Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026IP Rating: IPX8 under IEC 60529 up to 50 m, and IP6X dust-tight. Stored as the two published codes.

Dive rating

Not available

Not available

Max dive depthiMaker-rated depth for the stated diving use, not a conversion from the water-resistance pressure rating.

Not available

Not available

MIL-STD-810iMaker claim that the watch was tested against specified MIL-STD-810 methods. It is not a guarantee for every military-standard test.

Not available

Not available

MIL-STD-810 tests

Not available

Not available

Operating temperatureiPublished operating range. Source notes identify on-wrist limits and other operating conditions. Storage or charging limits are excluded.

Min0Max35°C1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Environmental requirements: operating temperature 32 to 95 F (0 to 35 C). Storage -20 to 45 C is excluded.

Min-10Max45°C1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Environmental conditions, printed page 63: operating temperature 14 to 113 F (-10 to 45 C). Non-operating and charging ranges (0 to 35 C) are not stored.

Display

10 of 14 differ

Display type

LTPO OLED1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

OLED2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Display: AMOLED display.

Display type (as published)

Retina LTPO OLED display1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

AMOLED2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Display: AMOLED display.

Screen sizeiPublished active display diagonal for a rectangular display, or diameter for a round display. Do not calculate it from pixels or display area.

1.57in(4 cm)24Spec databasem.gsmarena.com/apple_watch_se_2-11865.phpRead 10 October 2026Lists 1.78 inches for the 44mm model (448 x 368 pixels). A 1.57 inch 40mm value is not listed here.26Retailer pagedeviceguides.vodafone.co.uk/apple/watch-se-2nd-gen-watchos-9/specificationsRead 10 October 202640 mm: 1.57 inches, 394 x 324 pixels. 44 mm: 1.78 inches, 448 x 368 pixels. 326 ppi from Apple fits both.

1.58in(4 cm)12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Display size 1.58 inch. Notebookcheck and nextpit state the same. Fitbit publishes no diagonal.14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Displaygröße: 1,58 Zoll.

Resolution

324 × 394px1Maker product pagesupport.apple.com/en-us/111853Read 10 October 202640mm: 324 by 394 pixels. 44mm: 368 by 448 pixels.

336 × 336px12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Display resolution 336 x 336 pixels. Notebookcheck states the same.

Pixel densityiPublished pixel density. A rectangular diagonal formula must not be applied to a round display.

326ppi1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026326 pixels per inch, as published. The sheet gives it once for both sizes.

Not available

Display area

759mm²1Maker product pagesupport.apple.com/en-us/111853Read 10 October 202640mm: 759 sq mm. 44mm: 977 sq mm.

Not available

Touchscreen

Yes11Owner's manualsupport.apple.com/guide/watch/use-buttons-and-gestures-apd1d9d7efca/26/watchos/26Read 10 October 2026watchOS 26 guide: tap, touch and hold, and swipe on the screen.26Retailer pagedeviceguides.vodafone.co.uk/apple/watch-se-2nd-gen-watchos-9/specificationsRead 10 October 2026LTPO OLED touch screen, 16 million colours.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2: color AMOLED touchscreen display and 1 button.

Max refresh rateiHighest published display refresh rate in active operation.

Not available

60Hz18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Notebookcheck spec box lists 60 Hz. Fitbit publishes no refresh rate. Treated as a stated spec, not a measurement.

Min refresh rateiLowest published display refresh rate, usually in always-on mode. It is not the active-use minimum unless stated.

Not available

Not available

Peak brightnessiMaker peak-brightness claim. It may apply to a small area or bright ambient light. Full-screen limits and battery/temperature conditions belong in source notes.

1,000nits1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Up to 1000 nits maximum brightness. Conditions are not stated.

1,000nits12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Display brightness: Up to 1,000 nits. Fitbit publishes no nit figure in the documents read, so this is a spec database claim. Window size and ambient conditions are not stated.

Minimum brightness

Not available

Not available

Always-on display

No7Press releaseapple.com/newsroom/2025/09/apple-introduces-apple-watch-se-3Read 10 October 2026SE 3 'now features an Always-On display', so the previous generation (SE 2) has none.14Reviewdcrainmaker.com/2022/12/apple-watch-se-2nd-gen-2022-in-depth-review.htmlRead 10 October 2026Review: no always-on display. The screen turns off when the wrist is lowered.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Adjust always-on display section. The setting reduces battery life.3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Always-on display mode: keeps your display on at all times (may require more frequent charging).

Display cover

Other glass1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Gorilla Glass2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Display: Corning Gorilla Glass 3.

Display cover (as published)

Ion-X front glass1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Ion-X front glass.

Corning Gorilla Glass 32Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Display: Corning Gorilla Glass 3.

Platform

12 of 15 differ

Platform

watchOS3Press releaseapple.com/newsroom/2022/09/apple-reveals-apple-watch-series-8-and-the-new-apple-watch-seRead 10 October 2026watchOS 9 platform.

Proprietary2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026No OS name is printed on the spec page. The Fitbit blog says the watch is powered by the new Fitbit OS, a proprietary platform with its own Gallery.

OS at launch

watchOS 93Press releaseapple.com/newsroom/2022/09/apple-reveals-apple-watch-series-8-and-the-new-apple-watch-seRead 10 October 2026With watchOS 9, SE users get the new Compass app. watchOS 9 came on September 12, 2022.

Fitbit OS4Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Powered by the new Fitbit OS. No version number is published.

Software

Not available

Not available

Latest OS

watchOS 26.620Maker product pagesupport.apple.com/en-us/100100Read 10 October 2026Apple security releases list watchOS 26.6 (July 27, 2026) for Apple Watch Series 6 and later. watchOS 27 (September 14, 2026) is for Apple Watch Series 9 and later, which excludes the SE (2nd generation).21Press articleslashgear.com/2190231/apple-watchos-27-compatible-modelsRead 10 October 2026Lists the Apple Watch SE (2nd generation) among the models that will not be updated to watchOS 27.22Press articlemacobserver.com/news/watchos-26-6-now-available-how-to-update-and-whats-newRead 10 October 2026watchOS 26.6 (July 27, 2026) is available for Apple Watch Series 6 and later, Apple Watch SE 2 and later, and every Apple Watch Ultra model.25Spec databaseeverymac.com/systems/apple/apple-watch/specs/apple-watch-se-2-2022-gps-cellular-40mm-us-canada-a2726.htmlRead 10 October 2026EveryMac: maximum OS watchOS 26.x. The SE 2 does not support watchOS 27.

Fitbit OS, firmware 220.317Maker product pagesupport.google.com/googlehealth/answer/14236725Read 23 October 2026Fitbit firmware release notes: Sense 2 latest listed version 220.31 (bug fixes and improvements) on the access date. No Fitbit OS major version number is published.

Works with

iOS1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

iOS, Android2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Requirements: Apple iOS 16.4 or higher, Android OS 11.0 or higher, current on the access date.

Phone requirement

Current sheet: iPhone Xs or later, including iPhone SE (2nd generation or later), with iOS 18 or later. At launch: iPhone 8 or later with iOS 16.1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Compatibility line is the current sheet requirement. The launch release names iPhone 8 or later with iOS 16.

Google Health app on a compatible device running Apple iOS 16.4 or higher or Android OS 11.0 or higher2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Requirements: the Google Health app on a device running Apple iOS 16.4 or higher or Android OS 11.0 or higher. This is the current requirement. The 2022 launch requirement may have been lower.

App store

Yes10Owner's manualsupport.apple.com/guide/watch/get-apps-apd99e3c6a68/26/watchos/26Read 10 October 2026watchOS 26 guide: open the App Store on the watch and tap Get to install an app. watchOS 26 supports this model.

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026The Fitbit Gallery offers Fitbit apps and clock faces. Tom's Guide states third-party apps cannot be downloaded.17Reviewtomsguide.com/news/fitbit-sense-2Read 23 October 2026Review: you don't get access to third-party apps. You can download custom watch faces but not third-party apps. The Sense 2 and Versa 4 cannot.

Voice assistants

Siri1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Controls list Siri.

Amazon Alexa1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Voice Assistant: Amazon Alexa Built-in. Needs the phone app running in the background. Not available in all countries.3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Smarts and more: Alexa Built-in.

Chipset

Apple S8 SiP1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026S8 SiP with 64-bit dual-core processor and 2-core Neural Engine.

Ambiq Apollo4 Plus12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Platform: Ambiq Apollo4 Plus, ARM Cortex-M4 at 96-192 MHz. Fitbit publishes no chip and Notebookcheck says it does not disclose the SiP. Ambiq's own presentation says Apollo4 powers the Sense product line, which supports the chip family but not the Plus suffix.16Press articleambiq.com/wp-content/uploads/2022/12/Key-to-the-Future-of-Electronics.pdfRead 23 October 2026Ambiq presentation: Apollo4 powers Inspire, Versa and Sense product lines of Fitbit, and Versa 4, Sense 2 and Inspire 3 were launched in August 2022.

Process

7nm29Press articleithome.com/0/640/466.htmRead 10 October 2026Article dated September 12, 2022: the S6, S7 and S8 are based on the A13 Bionic and made on TSMC's 7nm process, with the same CPU identifier T8301. The claim comes from chip identifiers, not from Apple, which does not publish the node.30Press articleiphone-mania.jp/news-485990/ampRead 10 October 2026Article dated September 13, 2022, citing MacRumors: the S8 has the same CPU identifier as the S6 and S7, which were made on TSMC's 7nm process. Notebookcheck's spec table also lists 7 nm for the S8, per search snippet only.

Not available

CPU cores

21Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Dual-core processor. The Neural Engine cores are not counted.

112Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Same Platform entry: one ARM Cortex-M4 core.

CPU configuration

AApple Watch SE 2

Not available

BFitbit Sense 2

Count	Core	Max clock (GHz)
1	Arm Cortex-M4	0.192

Source12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Same Platform entry: ARM Cortex-M4 at 96-192 MHz. 192 MHz is stored as the maximum.

Max CPU clock

Not available

0.192GHz=CalculatedFrom CPU configuration

GPU

Not available

Not available

Low-power coprocessor

Not available

Not available

Memory

2 of 2 differ

RAMiKeep published GB values as stated. Convert a source explicitly labelled MB using 1000 MB per GB and preserve its original figure and unit in the note. Do not assume MB means MiB. Convert explicit MiB or GiB to decimal GB through their byte definitions, recording the conversion in the note. This normalization does not establish an exact physical byte count.

1GB24Spec databasem.gsmarena.com/apple_watch_se_2-11865.phpRead 10 October 2026Internal: 32GB 1GB RAM.25Spec databaseeverymac.com/systems/apple/apple-watch/specs/apple-watch-se-2-2022-gps-cellular-40mm-us-canada-a2726.htmlRead 10 October 2026EveryMac lists 1 GB onboard RAM for the SE 2 (asterisked, Apple does not publish it).26Retailer pagedeviceguides.vodafone.co.uk/apple/watch-se-2nd-gen-watchos-9/specificationsRead 10 October 20261 GB RAM with 32 GB storage.

2.75 MB12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Same entry: 2.75 MB on-chip SRAM, stored as 0.00275 GB with 1000 MB per GB. No maker figure exists.

StorageiTotal built-in storage the maker states, in decimal GB. Space available to the user is lower and goes in the source note. A figure the maker gives only as available space is not stored.

32GB1Maker product pagesupport.apple.com/en-us/111853Read 10 October 202632GB capacity.

4GB18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Performance and runtime: the manufacturer has installed 4 GB of internal storage, usable for apps and watch faces. Fitbit publishes no storage figure. Routes and music cannot be stored.

Health sensors

7 of 8 differ

Heart rate sensor

Second-generation optical heart sensor1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Multi-path optical heart rate sensor1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: multi-path optical heart rate tracker. The Google Store spells it Multi-path optical heart rate sensor.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Sensors and components: multi-path optical heart rate sensor.

ECG capabilityiElectrical heart sensing hardware with an ECG capability. The ECG app can require an eligible country, age and paired phone.

No5Maker product pagesupport.apple.com/en-us/111852Read 10 October 2026Footnote 5 of the Apple Watch Ultra sheet: the ECG app is available on Apple Watch Series 4 or later, not including Apple Watch SE.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: multipurpose electrical sensors compatible with the ECG app and EDA Scan app. The ECG app is not available in all countries.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Sensors: multipurpose electrical sensors compatible with ECG app and EDA app. ECG not available in all countries.

Blood oxygen sensingiBlood-oxygen sensing capability. App availability and medical status vary by market.

No14Reviewdcrainmaker.com/2022/12/apple-watch-se-2nd-gen-2022-in-depth-review.htmlRead 10 October 2026Review: no SpO2 sensor.15Maker product pagesupport.apple.com/en-us/120358Read 10 October 2026Blood Oxygen app is on Apple Watch Series 6 or later and all Ultra models. Footnote: not supported on Apple Watch SE.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: red and infrared sensors for oxygen saturation (SpO2) monitoring.

Skin temperature sensingiA sensor or supported function that measures skin temperature. It is not a core-body thermometer.

No7Press releaseapple.com/newsroom/2025/09/apple-introduces-apple-watch-se-3Read 10 October 2026SE 3 adds wrist temperature sensing and a more advanced set of health features than the previous generation.14Reviewdcrainmaker.com/2022/12/apple-watch-se-2nd-gen-2022-in-depth-review.htmlRead 10 October 2026Review: no wrist temperature sensing, which the Series 8 has.16Maker product pagesupport.apple.com/en-us/102674Read 10 October 2026Wrist temperature needs Apple Watch Series 8 or later, any Ultra, or SE 3. The SE (2nd generation) is not listed.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: on-wrist skin temperature sensor. Track your skin temperature changes: nightly variation from a personal baseline. Not available in all markets.

Blood pressure featureiPublished blood-pressure feature category. Hypertension notifications are not numerical blood-pressure readings.

None25Spec databaseeverymac.com/systems/apple/apple-watch/specs/apple-watch-se-2-2022-gps-cellular-40mm-us-canada-a2726.htmlRead 10 October 2026EveryMac: the SE 2 does not support Hypertension notifications.

None12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Blood pressure: No. The maker sensor list and feature pages have no blood-pressure feature.

Body composition sensor

Not available

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026The complete sensor list in Sensors and Components has no bioelectrical impedance sensor.12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Body composition: No.

Skin conductance (EDA)

Not available

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: electrical sensor to measure skin conductance (cEDA) for stress detection. Manage stress: continuous EDA identifies body responses.4Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Sense 2 has a new Body Response sensor for continuous electrodermal activity (cEDA).

Medical clearancesiNamed regulatory clearances and their jurisdiction. General water resistance or an ECG sensor does not establish medical clearance.

Not available

ECG app: FDA clearance, ECG app: EU clearance, Irregular Heart Rhythm Notifications: FDA clearance, Irregular Heart Rhythm Notifications: EU clearance3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Heart section: the ECG app assesses heart rhythm for atrial fibrillation. Clearance wording is in the Fitbit blog.5Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 23 October 2026Footnote and text: the ECG app on Sense 2 and the Irregular Heart Rhythm Notifications on both watches have FDA and EU clearance. Only in select countries, not for people under 22 or with known atrial fibrillation.

Motion and environment sensors

1 of 9 differ

Accelerometer

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: 3-axis accelerometer.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Sensors and components: 3-axis accelerometer.

Accelerometer range

Not available

Not available

Gyroscope

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: gyroscope.

Barometric altimeter

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026The sheet lists an always-on altimeter. Apple does not name the sensor type.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: altimeter, which tracks altitude changes.

Compass

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026The complete sensor list in Sensors and Components has no compass or magnetometer. Gadgets & Wearables also lists Compass: No.12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Compass: No. Geomagnetic: No.

Ambient light sensor

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: ambient light sensor.

Depth gauge

Not available

Not available

Depth gauge rangeiPublished measurement range of the depth gauge, distinct from maximum diving depth and water-pressure resistance.

Not available

Not available

Water temperature sensor

Not available

Not available

Health and fitness

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Health featuresiSupported health functions with country, phone and subscription restrictions in the source notes. Upcoming functions are not counted as available.

Heart rate alerts, Irregular rhythm notifications, Sleep tracking, Sleep stages, Noise monitoring1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Listed: high and low heart rate notifications and irregular rhythm notifications (not for people under 22 or previously diagnosed with AFib), Noise app, and Sleep app including sleep stages.

Continuous heart rate, Heart rate alerts, Irregular rhythm notifications, ECG app, Blood oxygen app, Heart rate variability, Sleep tracking, Sleep stages, Stress tracking, Readiness score, Cycle tracking1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Today and sleep sections: sleep stages (REM, light, deep) and sleep score, stress management score, readiness score (Premium), menstrual health tile, high and low heart rate notifications after 10 inactive minutes, heart-rate variability under Advanced health metrics, oxygen saturation. Daily readiness score needs Fitbit Premium. Irregular rhythm notifications and the ECG app come from the Fitbit blog.3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Heart rate tracking, high and low heart rate notifications, irregular heart rhythm notifications, ECG app, HRV, breathing rate, SpO2, sleep tracking and sleep stages, Stress Management Score, Daily Readiness Score, menstrual health tracking. The Daily Readiness Score is a Premium feature in the manual.

Fitness featuresiSupported workout functions. A sport-profile name alone does not prove advanced metrics such as running power or running dynamics. Trackback follows the recorded route back to the start. A compass arrow that points straight to the start does not count.

Training load, Running dynamics, Interval workouts, Pool swim, Open water swim, Trackback1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Listed: Custom workouts, Training load, stride length, ground contact time and vertical oscillation, Pool swim or open water swim, and Backtrack GPS data.

Automatic workout detection, VO2 max, Pool swim, Interval workouts, Turn-by-turn navigation1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Exercise settings list Pool Length, Interval, Auto Start and Auto-Stop. Track your exercise automatically (SmartTrack, 15 minute minimum). Google Maps gives turn-by-turn directions and needs the paired phone nearby with the app running. View your cardio fitness score (stored as vo2_max, see the Google Health VO2 max help page).3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Fitness features: Cardio Fitness Score estimated from VO2 max, SmartTrack Automatic Exercise Recognition (in app only), Google Maps turn-by-turn directions.11Maker product pagesupport.google.com/googlehealth/answer/14237924Read 23 October 2026Learn about your VO2 max: VO2 max, formerly the cardio fitness score, is estimated during outdoor runs with GPS. The Sense 2 manual names the cardio fitness score.

Sport profilesiPublished count of distinct sport/activity profiles. A claim such as 180+ is not an exact integer count.

Not available

Not available

Dive modesiActual supported dive modes. Water resistance or a depth app alone does not establish decompression-capable scuba support.

Not available

Not available

External sensorsiTypes of external workout sensors the watch can pair with. GPS reception, phone data and built-in sensors do not qualify.

Heart rate strap, Power meter, Speed and cadence13Owner's manualsupport.apple.com/guide/watch/apd4cbc876c7/26/watchos/26Read 10 October 2026watchOS 26 cycling guide: Bluetooth cycling accessories such as power meters, speed sensors and cadence sensors connect automatically. The SE 2 sheet also lists connection to cycling accessories via Bluetooth. Heart rate strap: see the DC Rainmaker review. No ANT+ is claimed.14Reviewdcrainmaker.com/2022/12/apple-watch-se-2nd-gen-2022-in-depth-review.htmlRead 10 October 2026Review states a Bluetooth heart rate sensor can be paired in the Bluetooth settings (watchOS 9 at review time).

Not available

Safety

4 of 6 differ

Fall detectioniAutomatic fall detection. Incident detection restricted to recorded workouts is not counted as general fall detection.

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Safety list: Fall Detection.

No9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026Safety and emergency rows (Safety Check, Emergency Sharing, Medical information, Fall Detection, Emergency SOS, Emergency international calling, Car Crash Detection, Earthquake Alerts): the Sense 2 column is empty for all of them. No fall detection.

Car crash detection

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Safety list: Crash Detection. Requires Apple Watch Series 7, SE, Ultra or later per footnote 4.

No9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026Same Safety rows: Car Crash Detection is empty in the Sense 2 column.

Emergency SOSiA manual emergency alert to emergency services or preset contacts. Source notes identify the recipient, paired-phone requirement and country limits. Satellite is listed separately.

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Safety list: Emergency SOS. Needs a cellular connection or Wi-Fi calling from the watch or a nearby iPhone.

No9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026Same Safety rows: Emergency SOS is empty in the Sense 2 column.

Emergency sireniPublished or measured siren sound level in decibels. Audible distance alone does not establish this value. Measurement distance belongs in source notes.

Not available

Not available

Live location sharingiShares live location during supported use. A paired phone or data subscription may be required.

Not available

Not available

Dedicated LED flashlightiA dedicated hardware LED flashlight. Lighting the display white is not counted.

Not available

No9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026No flashlight appears in the Sense 2 sensor and component list. Gadgets & Wearables states Flashlight: No.12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Flashlight: No.

Positioning

3 of 3 differ

PositioningiPublished satellite systems and signal bands. Do not infer bands from dual-frequency support alone.

L1 GPS, GNSS, Galileo, QZSS1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Connectivity: L1 GPS, GNSS, Galileo and QZSS, as published. Signal bands other than L1 are not named.

GPS, GLONASS1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: built-in GPS receiver + GLONASS. Dynamic GPS can use the phone's GPS instead to save battery. No band or dual-frequency claim.4Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Built-in GPS is named for Sense 2.

Dual-band GNSSiMaker-stated dual-frequency satellite reception. Supported constellations and signal bands are listed separately.

No1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Sheet lists L1 GPS only. The Ultra sheet lists L1 and L5 GPS for comparison.

Not available

Offline mapsiMap data stored on the watch and usable without live phone data. GPX routes or breadcrumb tracks alone are not offline maps.

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Hiking list: offline maps with custom route creation.

No12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Offline maps: No. The manual requires the phone and background app for Google Maps.

Connectivity

9 of 15 differ

BluetoothiPublished Bluetooth support for this model. The version is recorded separately. Unknown version does not mean the radio is absent.

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Wireless technology: Bluetooth 5.0 radio transceiver and NFC chip.

Bluetooth version

5.31Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

5.01Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Wireless technology, printed page 62: Bluetooth 5.0 radio transceiver and NFC chip.14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Bluetooth: 5.

Wi-FiiPublished Wi-Fi support for this model. The standard and bands are recorded separately. Unknown standard does not mean Wi-Fi is absent.

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: WiFi (deactivated, cannot be turned on). Stored as false because the user cannot use it. No Wi-Fi standard is stored.

Wi-Fi standard

Wi-Fi 41Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Connectivity: Wi-Fi 4 (802.11n).

Not available

Wi-Fi bands

2.4 GHz24Spec databasem.gsmarena.com/apple_watch_se_2-11865.phpRead 10 October 2026WLAN: Wi-Fi 802.11 b/g/n, no dual-band note. EveryMac and Vodafone state 2.4 GHz.25Spec databaseeverymac.com/systems/apple/apple-watch/specs/apple-watch-se-2-2022-gps-cellular-40mm-us-canada-a2726.htmlRead 10 October 2026All Apple Watch SE 2 models have built-in support for 802.11b/g/n 2.4 GHz and Bluetooth 5.3.26Retailer pagedeviceguides.vodafone.co.uk/apple/watch-se-2nd-gen-watchos-9/specificationsRead 10 October 2026802.11 b/g/n on the 2.4 GHz band.

Not available

CellulariTrue when a cellular edition is sold. A variant row states whether that individual model has cellular hardware.

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Sold as GPS and GPS + Cellular. Connectivity lists LTE and UMTS. Needs a carrier plan.

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026No cellular radio is listed in Wireless technology (Bluetooth and NFC only).

Network

LTE1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Not available

4G bandsiPublished LTE bands for the stated regional cellular model. Do not transfer bands to another region or Wi-Fi-only model.

1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 17, 18, 19, 25, 26, 39, 40, 41, 6624Spec databasem.gsmarena.com/apple_watch_se_2-11865.phpRead 10 October 2026USA, LATAM, Canada models A2726 and A2727: 1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 17, 18, 19, 25, 26, 39, 40, 41, 66. The base value is the cellular reference model, as for the other cellular fields, and the GPS rows have no LTE. International, China and Hong Kong models (A2725, A2724, A2855, A2856) are not stored because GSMArena lists band 6 for them and EveryMac does not.25Spec databaseeverymac.com/systems/apple/apple-watch/specs/apple-watch-se-2-2022-gps-cellular-40mm-us-canada-a2726.htmlRead 10 October 2026A2726 LTE bands 1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 17, 18, 19, 25, 26, 39, 40, 41 and 66. Not compatible with bands 8, 20 and 28. The A2727 page lists the same bands. The A2725, A2724 and A2856 pages list international bands 1, 2, 3, 4, 5, 7, 8, 18, 19, 20, 25, 26, 28, 39, 40, 41 and 66, without band 6, so the international models are not stored.

Not available

5G bandsiPublished 5G NR bands for the stated regional cellular model. RedCap support does not establish conventional full-bandwidth phone 5G.

Not available

Not available

NFCiSome regions sell an NFC edition, so it is per variant.

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Apple Pay is listed. NFC itself is not named.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Wireless technology: NFC chip. Contactless Payments section describes the built-in NFC chip.

Contactless payments

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Contactless Payments: set up Google Wallet in the Fitbit app and pay at contactless terminals.3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Smarts and more: Google Wallet, make purchases from your wrist everywhere Google Pay is accepted.

Payment services

Apple Pay1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Google Wallet1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Contactless Payments: Google Wallet. The text also names Fitbit Pay for the older service name.

Ultra-wideband

No17Maker product pagesupport.apple.com/en-us/109512Read 10 October 2026Apple's Ultra Wideband availability page lists the watches with a first or second generation chip: Series 6 and later and the Ultra models. No Apple Watch SE is listed.

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Wireless technology lists only a Bluetooth radio and an NFC chip. No UWB radio.

Satellite

Not available

None9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026No satellite feature in any Safety row. Published radios are Bluetooth and NFC. GPS reception is separate.

ANT+

Not available

Not available

Audio

3 of 4 differ

Speaker

Yes1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components lists Speaker and Microphone. The Google Store rates the speaker at 75 dB SPL at 10 cm. That is not an emergency siren.

Microphones

11Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Hardware and Buttons lists one Microphone.

Not available

Calls on the watchiVoice-call capability of the marketed model, including sold cellular editions. Variant radio capability and paired-phone requirements still apply.

Cellular or phone1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Cellular models call without the iPhone. The sheet lists Auto-Answer Calls and Wi-Fi calling for Emergency SOS.

Phone only1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Answer or reject phone calls and Take on-wrist phone calls: calls go through the paired iPhone or Android phone, which must be nearby with the Fitbit app running. No cellular model exists.

Music on the watchiPlays audio stored on the watch. Remote control of phone playback or streaming alone does not qualify.

Yes9Owner's manualsupport.apple.com/guide/watch/add-music-apd483798d11/watchos/26Read 10 October 2026watchOS 26 guide: to play music when not connected to the internet, download it to the watch first.

No12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026On-board music storage: No. Smartphone music control only.

Controls

4 of 5 differ

ButtonsiPhysical controls used to operate the watch, excluding the rotating crown and strap-release buttons. A clickable rotating crown is counted only in Crown.

11Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Hardware lists a Digital Crown and a side button. The crown is not counted.

11Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2: color AMOLED touchscreen display and 1 button.

Named operating buttonsiNames of operating buttons, excluding the crown and strap-release controls.

Side button1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Button1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2: the single button opens the apps menu, returns to the clock face and has long-press and double-press shortcuts.

CrowniA crown that rotates to control the interface. A round push button that does not rotate is not a crown.

Rotating haptic1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Controls: Digital Crown with haptic feedback.

None1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2 describes only the touchscreen and 1 button. No crown.

Rotating bezeliPhysical rotation or touch gestures around the display edge. A fixed decorative bezel is None.

Not available

None1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2 describes only the touchscreen and 1 button. No bezel control.

Gestures

Not available

Turn your wrist, Briefly cover the watch face with your opposite hand, Triple-tap the screen1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Screen wake setting: Button & motion turns the screen on when you turn your wrist. Turn off the screen: briefly cover the watch face with your opposite hand, except with always-on display. Screen Zoom: Magnify works on a triple-tap.

Battery and charging

11 of 13 differ

Battery capacityiPublished battery capacity for the stated case size. Rated and typical capacity are distinguished in source notes.

245mAh24Spec databasem.gsmarena.com/apple_watch_se_2-11865.phpRead 10 October 2026Li-Ion 296 mAh, listed with the 44mm dimensions.26Retailer pagedeviceguides.vodafone.co.uk/apple/watch-se-2nd-gen-watchos-9/specificationsRead 10 October 2026Non-removable Li-Ion 245 mAh (40 mm) and 296 mAh (44 mm). The 40mm value matches the 3C filing figure in the iPhone Mania report.27Press articleiphone-mania.jp/news-486403/ampRead 10 October 2026Battery capacities from China 3C certification data, as reported via MySmartPrice: SE (2nd generation) 40mm 245 mAh and 44mm 296 mAh.28Retailer pageifixit.com/products/apple-watch-44-mm-se-and-series-5-replacement-batteryRead 10 October 202644 mm replacement battery A2181: 296 mAh, 1.129 Wh, 3.814 V. Listed as compatible with the SE 2 44 mm models A2727, A2724, A2856 and A2723. 296 mAh x 3.814 V = 1.129 Wh.

162mAh12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Battery: rechargeable lithium-polymer battery, 162 mAh.13Retailer pageifixit.com/products/fitbit-sense-2-batteryRead 23 October 2026iFixit replacement battery listing for Sense 2: 0.62 Wh, 3.87 V, 162 mAh. 162 mAh x 3.87 V = 0.627 Wh, which agrees. It is a parts listing, not a teardown. Gadgets & Wearables, Notebookcheck and nextpit also state 162 mAh. Two Argos listings print 260 mAh, which is not used.14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Batteriekapazität (Netto): 162 mAh.

Claimed battery lifeiMaker endurance claims with distinct operating modes and case sizes. With solar describes augmentation of that estimate, not hardware capability. Use false for ordinary claims without solar augmentation, true for explicitly solar-aided claims, and omit it when solar qualification is unclear. Source notes state AOD, GNSS, music and solar conditions. Do not create a normal-use row from an AOD-only claim. Low power denotes the maker battery-saver mode. Keep its typical, light-use and always-on claims separate from standard-mode claims. GPS power saving identifies an intermediate reduced-accuracy GNSS saving preset. Source notes retain the maker's preset name and published conditions. Max battery GPS is the distinct maximum-saving claim. When the maker has only one GPS saving preset, it is GPS power saving.

AApple Watch SE 2

Mode	With solar	Hours (h)
Smartwatch	No	18

Source1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026All-day battery life, up to 18 hours of normal use. Footnote 2: 90 time checks, 90 notifications, 45 minutes of app use and a 60-minute workout with music over 18 hours. Apple testing in August 2022.

BFitbit Sense 2

Mode	With solar	Hours (h)
Smartwatch	No	144
Always-on	No	72
GPS	No	5

Source2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Battery and power: battery life of 6+ days, stored as 144 h as a minimum figure. Up to 5 hours with continuous GPS, stored as the gps row. The always-on display, SpO2 and cEDA sensor need more frequent charging. The Google Health support article states up to 12 hours with continuous GPS for Sense 2, a conflict. The model spec page is used because the Oct 2022 Fitbit.com page printed the same 5 hours.6Maker product pagesupport.google.com/googlehealth/answer/14226518Read 23 October 2026Estimated battery life table: Fitbit Sense 2 6+ days. Footnote: with always-on display, Sense 2 has a battery life of up to 3 days (stored as 72 h always_on). The same footnote says Sense 2 has up to 12 hours with continuous GPS, which conflicts with the 5 hours on the model spec page. The 12 hour figure is not stored.10Maker product pageweb.archive.org/web/20221022073607/https://www.fitbit.com/global/us/products/smartwatches/sense2Read 23 October 2026Archived Fitbit.com Sense 2 page, Oct 22, 2022: battery life of 6+ days and up to 5 hours with continuous GPS. Same wording as the current Google Store.

Smartwatch mode (claimed)iMaker normal-use smartwatch claim without solar. A watch with only an explicit AOD-mode claim has no value here. Workloads differ and source notes must be read.

18h=CalculatedFrom Claimed battery life

144h=CalculatedFrom Claimed battery life

AOD battery life (up to)iMaker claimed smartwatch endurance with the always-on display enabled and without solar, for the base case. Source notes preserve workload and case conditions. This is a claim, not a measured test or an AOD-off estimate.

Not available

72h=CalculatedFrom Claimed battery life

GPS mode (claimed)iMaker regular GPS/GNSS activity claim without solar, for the base case. AOD, multi-band, music and power-saving conditions have separate rows when published.

Not available

5h=CalculatedFrom Claimed battery life

Solar chargingiPublished solar charging hardware capability. An ordinary battery estimate without solar augmentation does not prove that the watch lacks solar charging hardware.

Not available

Not available

Charging methodiThe connection at the watch, not the cable end at the USB adapter. A proprietary inductive puck is not Qi unless interoperability is explicitly established.

Magnetic puck1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026In the box: Apple Watch Magnetic Charger to USB-C Cable.

Magnetic pins1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Charge your watch: hold the cable end near the port on the back until it attaches magnetically. The pins on the cable align with the port on the back.

Charging guidanceiPublished charging requirements, nominal estimates and compatibility guidance. Keep adapter ratings separate from power accepted by the watch.

Apple measured charge times with the included Apple Watch Magnetic Charger to USB-C Cable (A2652) and an Apple 20W USB-C Power Adapter (A2305). The adapter is not in the box.1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

Not available

Max charging power (watch)iPublished maximum charging power at the watch. Adapter rating or charger input power does not prove the power accepted by the watch.

Not available

Not available

Fast chargingiAn explicit fast-charging capability claim. A short charging time or high adapter wattage alone does not qualify.

No7Press releaseapple.com/newsroom/2025/09/apple-introduces-apple-watch-se-3Read 10 October 2026SE 3 'features fast charging for the first time', so SE 2 has none.14Reviewdcrainmaker.com/2022/12/apple-watch-se-2nd-gen-2022-in-depth-review.htmlRead 10 October 2026Review: fast charging is not included on the SE (2022).18Maker product pagesupport.apple.com/en-us/102454Read 10 October 2026Fast charging is supported on Apple Watch Series 7 and later, SE 3 and Ultra and later. The SE (2nd generation) is not listed.

Yes5Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 23 October 2026Fast charging gets a full day's worth of battery in just 12 minutes.

Quick charge claimiMaker claim for usage from a short charge. Source notes identify the usage workload, such as normal use or sleep tracking.

Not available

Charge time12 minUse time24 h1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Charge your watch: charge Sense 2 for 12 minutes for 24 hours of battery life. The usage workload is not named.

Charge 0 to 80% (claimed)iMaker claim for charging an empty battery to 80%. Charger and approximate qualifiers belong in source notes.

90min1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Up to 80% charge in about 1.5 hours. Footnote 3 gives the test conditions.

Not available

Full charge time (claimed)iMaker advertised nominal full-charge duration. Approximate or theoretical maker estimates are allowed, with their conditions in source notes. Partial-charge intervals do not qualify. Measured 0 to 100% tests have a separate field.

Not available

120min1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Charge your watch: charging fully takes about 1-2 hours. The Google Store spec page states two hours and is stored.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Battery and power: the Oct 2022 Fitbit.com spec text states charge time (0-100%): two hours.

Measured

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Peak brightness (measured)iReviewer measurement. Source notes state screen area, mode and ambient light. A small-area peak claim cannot be replaced with a full-screen measurement.

Not available

Not available

Battery life (measured)iReviewer-observed mixed-use endurance. Source notes state case size, AOD, workout use and whether it was a complete discharge. Extrapolation from partial discharge is excluded.

Not available

144h18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Battery life: with all measurements active, worn around the clock, automatic training detection on, no extensive workouts and the always-on display off, the Sense 2 lasts exactly six days (144 h). Firmware and brightness are not stated. The always-on display test (just under four days) has no exact figure and is not stored.

Battery tests (measured)iReviewer-observed endurance, with case size and test settings in source notes. Partial-discharge projections are not stored as measured endurance.

AApple Watch SE 2

Not available

BFitbit Sense 2

Test	Hours (h)
Mixed use, always-on display off	144

Source18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Same test: always-on display off, all measurements active, automatic training detection, no extensive workouts. 6 days converted to 144 h. With the always-on display on it lasted just under four days, which is not stored as a number.

Full charge time (measured)iReviewer measurement from empty to full, not 0-80% or a charge from 5%. Source notes name the charger and case size.

Not available

95min18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Battery life: 0 to 99 percent after 85 minutes on a 24-watt power supply and another 10 minutes for the last percent. Stored as 95 minutes for 0 to 100 percent. 0 to 80 percent took one hour. Test unit with the supplied charging cable and a 24 W adapter. The maker claims two hours.

Strap

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Lug widthiDistance between standard strap attachment lugs, not the decorative width of a proprietary strap. Unknown for custom connectors unless the maker publishes lug width.

Not available

24mm3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026The store shows an accessory shop headed Shop 24mm attach accessories. Fitbit publishes no lug width in a spec table, and the connector is proprietary, so this is the maker's attach size only.18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Case and features: the strap is 24 millimeters wide and can be changed without tools. It is not a standard clasp, so 24 mm is the strap width, not a lug width for standard straps.

Quick-release strapiThe supplied strap can be detached through its quick-release mechanism. Compatibility with quick-release replacement straps alone does not qualify.

Yes19Maker product pagesupport.apple.com/en-us/108908Read 10 October 2026Hold down the band release button, then slide the band across to remove it.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Change the band: slide the flat latch button toward the band, pull the band away. Attach by pressing until it clicks. No tools.

Strap systemiPublished attachment system and compatible case sizes. Proprietary connectors are distinguished from standard spring bars.

Apple Watch proprietary slide-in band connector with a case-mounted band-release button. 40mm case: bands for 38mm, 40mm and 41mm cases. 44mm case: bands for 42mm, 44mm and 45mm cases.19Maker product pagesupport.apple.com/en-us/108908Read 10 October 2026Bands for 38mm, 40mm and 41mm cases are compatible with each other. Bands for 42mm, 44mm and 45mm cases are compatible with each other.

Proprietary latch connector. Fitbit Sense, Versa 3 and Versa 4 bands are compatible.1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Change the band: Fitbit Sense, Fitbit Versa 3, and Fitbit Versa 4 bands are compatible with Sense 2. Band latches on the back. No lug width is stated in the manual.

Strap materialiMaterial of the supplied strap for the stated package. Do not substitute material from another band sold separately.

Not available

Other1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Materials: the supplied band is a flexible, durable elastomer similar to the material used in many sports watches. Other preserves that wording without guessing silicone, HNBR or fluoroelastomer.

Strap

Not available

Classic band2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026What's in the box: Classic band (Small and Large).

Strap sizesiPublished wrist-circumference range for the stated strap or case. Source notes distinguish an overall compatible wrist range from one supplied strap size.

AApple Watch SE 2

Size	Wrist (min) (mm)	Wrist (max) (mm)
Overall compatible case wrist range, varies by band	130	200

Source1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Fits 130-200 mm wrists (40mm) and 140-245 mm wrists (44mm) across the bands that Apple sells.

BFitbit Sense 2

Size	Wrist (min) (mm)	Wrist (max) (mm)
Small	140	180
Large	180	220

Source1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Band size, printed page 63: Small band fits a wrist of 140 to 180 mm (5.5 to 7.1 in), Large band 180 to 220 mm (7.1 to 8.7 in). The Google Store page prints different ranges (130 to 180 mm and 165 to 220 mm). The manual is preferred. These are the supplied straps.

Regulatory

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FCC ID

Not available

XRAFB5211Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026USA FCC statement: Model FB521, FCC ID XRAFB521.

SAR limb (US)iPublished limb/wrist SAR for the stated base regional model under the US regime. Other case sizes or radio versions can differ. Head or body SAR is excluded.

Not available

Not available

SAR limb (EU)iPublished limb/wrist SAR for the stated base regional model under the EU regime. Other case sizes or radio versions can differ. Head or body SAR is excluded.

Not available

Not available

Other certifications

Not available

RED (2014/53/EU), UK Radio Equipment Regulations 2017, IEC 62368-1:2014, IEC 62368-1:2020 + A11:2020, ISED Canada (IC: 8542A-FB521)1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026EU section: Fitbit LLC declares Model FB521 compliant with Directive 2014/53/EU. UK section: Radio Equipment Regulations 2017. Safety Statement lists IEC 62368-1:2014 and IEC 62368-1:2020 + A11:2020. Canada section lists IC 8542A-FB521. These are model declarations, not medical, military or diving certifications.

In the box

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In the box

Apple Watch SE, Band, Apple Watch Magnetic Charger to USB-C Cable (1m)1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026Apple Watch SE, band, charger cable.

Fitbit Sense 2, Classic band (small & large), Charging cable1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026What's in the box: watch with small band, charging cable and an additional large band.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026What's in the box: Fitbit Sense 2 Classic band (Small and Large), charging cable.

Power adapter in boxiA mains/USB power adapter is supplied. A charging cable, inductive puck or charging dock alone does not count.

No1Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026What's in the box lists the watch, bands and the charging cable. No power adapter. The cable plugs into a USB port or a UL-certified USB wall charger.

Links

Not compared

Product page

support.apple.com/en-us/1118531Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

store.google.com/us/product/fitbit_sense_23Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Google Store product page for Fitbit Sense 2 (US).

Spec sheet

support.apple.com/en-us/1118531Maker product pagesupport.apple.com/en-us/111853Read 10 October 2026

store.google.com/us/product/fitbit_sense_2_specs2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026This page is the maker's technical specs page for Sense 2.

Manual

support.apple.com/en-gb/guide/watch/welcome/26/watchos/2612Owner's manualsupport.apple.com/guide/watch/apple-watch-models-apd2054d0d5b/26/watchos/26Read 10 October 2026watchOS 26 Apple Watch User Guide. Its Apple Watch models page lists Apple Watch SE (2nd generation). watchOS 27 does not support this model.

storage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0d1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Fitbit user manual, version 3.1, hosted on the Google Health Help Center user manuals page.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

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Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

1year23Maker product pageapple.com/legal/warranty/products/warranty-us.htmlRead 10 October 2026Apple Watch warranty, US: one (1) year limited warranty from the original retail purchase. Statutory consumer rights are separate.

1year8Maker product pagesupport.google.com/product-documentation/answer/14815834Read 23 October 2026Fitbit Limited Warranty: new products carry one year from purchase, two years for EEA residents who bought in the EEA. Devices bought on or after July 11, 2023 fall under the Google Hardware Warranty Center terms. Stored as the US one-year term.

Both are also in the API. Back to all smartwatches.