# Samsung Galaxy Watch 8
**Samsung Galaxy Watch 8** is a [Wear OS](https://www.edgepedia.org/wear-os) [smartwatch](https://www.edgepedia.org/smartwatch) introduced by [Samsung Electronics](https://www.edgepedia.org/samsung-electronics) on July 9, 2025 at Galaxy Unpacked in New York, together with the Galaxy Watch8 Classic, as the mainline model of the 2025 Galaxy Watch lineup.[1](https://www.samsungmobilepress.com/articles/samsung-galaxy-watch8-series-ultra-comfort-from-sleep-to-workout) Samsung positioned the series as its thinnest and most comfortable Galaxy Watch to that point, built for continuous health tracking, and it launched alongside the Galaxy Z Fold7 and Galaxy Z Flip7 foldable phones.[1](https://www.samsungmobilepress.com/articles/samsung-galaxy-watch8-series-ultra-comfort-from-sleep-to-workout) • [2](https://as.com/futbol/femenino/la-embajadora-de-samsung-alexia-putellas-es-la-imagen-de-la-nueva-generacion-de-dispositivos-plegables-galaxy-y-la-serie-galaxy-watch8-n/)
| Key fact | Detail |
|---|---|
| Announced | July 9, 2025, Galaxy Unpacked, New York; models are Galaxy Watch8 and Galaxy Watch8 Classic[1](https://www.samsungmobilepress.com/articles/samsung-galaxy-watch8-series-ultra-comfort-from-sleep-to-workout) |
| Sizes and platform | 40 mm and 44 mm Bluetooth and LTE variants; Wear OS powered by Samsung[3](https://www.samsung.com/ph/watches/galaxy-watch/galaxy-watch8-44mm-silver-bluetooth-sm-l330nzs1asa/) |
| Design | Cushion-derived "squircle" case, new band attachments, thinnest Galaxy Watch to date[1](https://www.samsungmobilepress.com/articles/samsung-galaxy-watch8-series-ultra-comfort-from-sleep-to-workout) • [4](https://www.androidauthority.com/samsung-galaxy-watch-8-review-3590714/) |
| Display | 50% brighter than the Galaxy Watch 7's panel[4](https://www.androidauthority.com/samsung-galaxy-watch-8-review-3590714/) |
| Sensors | BioActive sensor for heart rate, blood oxygen, and body composition; temperature sensor, accelerometer, barometer, gyroscope, geomagnetic sensor, and light sensor[5](https://cincodias.elpais.com/smartlife/gadgets/2025-07-09/samsung-galaxy-watch8-oficiales-caracteristicas.html) |
| Battery | Officially 30 hours with the always-on display; a week-long independent test measured about 25 hours under the same setting[6](https://www.techradar.com/health-fitness/smartwatches/samsung-galaxy-watch-8-review) |
| Distinctive health tools | Antioxidant Index measurement, and Samsung Health Monitor features (ECG, blood pressure, sleep apnea detection)[7](https://files.customersaas.com/files/UWzcNnctc8M2d1DGhn6RO9RJ.pdf) • [8](https://www.watch.co.uk/download/galaxywatch8-manual-en-pdf/) |
## Design and hardware
The Watch8 series adopts the cushion-shaped case language first used on the Galaxy Watch Ultra, which Samsung applied across the whole lineup to establish a single design identity. Reviewers describe the result as a "squircle" look with revised band attachments, a thinner and lighter build than the Watch 7, a display 50% brighter than the previous year's model, and a slightly larger battery.[1](https://www.samsungmobilepress.com/articles/samsung-galaxy-watch8-series-ultra-comfort-from-sleep-to-workout) • [4](https://www.androidauthority.com/samsung-galaxy-watch-8-review-3590714/) Comfort was the headline claim: Samsung's press material calls it the thinnest, most comfortable Galaxy Watch ever, and Android Central's review concluded that the thin-and-light build largely delivers on that positioning.[1](https://www.samsungmobilepress.com/articles/samsung-galaxy-watch8-series-ultra-comfort-from-sleep-to-workout) • [9](https://www.androidcentral.com/wearables/samsung-galaxy-watch/samsung-galaxy-watch-8-review)
The watch comes in 40 mm and 44 mm sizes in [Bluetooth](https://www.edgepedia.org/bluetooth) and cellular versions, and runs Wear OS powered by Samsung.[3](https://www.samsung.com/ph/watches/galaxy-watch/galaxy-watch8-44mm-silver-bluetooth-sm-l330nzs1asa/) Reviews identify the processor as the Exynos 1000.[10](https://www.youtube.com/watch?v=Ms3OfjlI520) In Japan, reservations opened on July 17, 2025, with retail release from early August.[11](https://prtimes.jp/main/html/rd/p/000000764.000030942.html)
## Health and fitness features
The BioActive sensor assembly monitors heart rate, blood oxygen level, and body composition, supplemented by a temperature sensor, accelerometer, barometer, gyroscope, geomagnetic sensor, and light sensor.[5](https://cincodias.elpais.com/smartlife/gadgets/2025-07-09/samsung-galaxy-watch8-oficiales-caracteristicas.html) The user guide documents an Antioxidant Index feature, in which the watch is configured to measure and track a carotenoid-based antioxidant reading, a measurement new to this generation.[7](https://files.customersaas.com/files/UWzcNnctc8M2d1DGhn6RO9RJ.pdf)
Through the Samsung Health Monitor app on a paired phone, the watch supports electrocardiogram (ECG) recordings, blood pressure tracking, and sleep apnea analysis, with results that can be shared with experts.[7](https://files.customersaas.com/files/UWzcNnctc8M2d1DGhn6RO9RJ.pdf) • [8](https://www.watch.co.uk/download/galaxywatch8-manual-en-pdf/) The manual restricts these biometric measurements to users aged 22 and over.[8](https://www.watch.co.uk/download/galaxywatch8-manual-en-pdf/) The Watch8 series also pairs with [Samsung Health](https://www.edgepedia.org/samsung-health) for cycle tracking, supporting menstrual logging, ovulation prediction, fertility windows, and symptom records.[12](https://www.samsung.com/uk/support/mobile-devices/health-features-on-the-galaxy-watch8-and-watch8-classic/?msockid=209ce2147f1d695b0e77f46b7eb3682b)
On the software side, the watch carries on-wrist Google Gemini integration; Samsung's demonstration showed that a spoken request such as "start a 300-calorie circuit training workout" prompts Gemini to launch Samsung Health for exercise tracking.[13](https://news.samsung.com/in/galaxy-unpacked-2025-a-first-look-at-the-galaxy-watch8-series-streamlining-sleep-exercise-and-everything-in-between)
## Battery life in practice
Samsung rates the Watch 8 at 30 hours on a single charge with the always-on display enabled. TechRadar's tester, wearing the watch continuously through sleep and workouts, drained it in about 25 hours with the always-on display on, matching Samsung's figure closely and outlasting a typical [Apple Watch](https://www.edgepedia.org/apple-watch), though well short of dedicated running watches.[6](https://www.techradar.com/health-fitness/smartwatches/samsung-galaxy-watch-8-review) Android Central's reviewer found the battery the watch's biggest weakness, needing two 30-minute charging sessions daily to cover sleep tracking and all-day wear, and noted that days with more than 150 minutes of recorded activity cut runtime further.[9](https://www.androidcentral.com/wearables/samsung-galaxy-watch/samsung-galaxy-watch-8-review)
## Accuracy and reception
In TechRadar's testing, the Watch8's workout metrics fell within the margin of error of a Garmin Venu X1 worn simultaneously, which the reviewer read as sufficient accuracy for both devices, and Samsung Health followed runs with identified improvement areas and specific recommended drills.[6](https://www.techradar.com/health-fitness/smartwatches/samsung-galaxy-watch-8-review) TechRadar called it the best mainline Galaxy Watch in years, and Tom's Guide recommends it as the default choice for most Galaxy users.[6](https://www.techradar.com/health-fitness/smartwatches/samsung-galaxy-watch-8-review) • [14](https://www.tomsguide.com/best-picks/best-samsung-watch)
## Relation to the Galaxy Watch 9
The successor Galaxy Watch 9 is very similar hardware, differing mainly in software and wellness features: a redesigned health app with a Vitals tab for long-term trend data, a Heart Health score from 1 to 100, and an FDA-cleared sleep apnea detection feature, some of which may reach older models through firmware updates.[15](https://www.tomsguide.com/wellness/smartwatches/forget-the-samsung-galaxy-watch-9-the-watch-8-is-just-as-good-and-usd114-off-right-now) Tom's Guide's launch article reports that the Galaxy Watch 8 supports Running Coach; the watch also supports Vascular Load monitoring.[14](https://www.tomsguide.com/best-picks/best-samsung-watch) • [16](https://www.tomsguide.com/wellness/smartwatches/meet-the-samsung-galaxy-watch-8-the-first-android-smartwatch-with-gemini-ai-built-in)
## References
1. [Samsung Galaxy Watch8 Series: Ultra Comfort, from Sleep to Workout, Samsung Mobile Press (July 9, 2025)](https://www.samsungmobilepress.com/articles/samsung-galaxy-watch8-series-ultra-comfort-from-sleep-to-workout)
2. [Samsung ambassador Alexia Putellas and the Galaxy Watch8 series, AS.com](https://as.com/futbol/femenino/la-embajadora-de-samsung-alexia-putellas-es-la-imagen-de-la-nueva-generacion-de-dispositivos-plegables-galaxy-y-la-serie-galaxy-watch8-n/)
3. [Samsung Galaxy Watch8 (Bluetooth, 44 mm) specifications, Samsung Philippines](https://www.samsung.com/ph/watches/galaxy-watch/galaxy-watch8-44mm-silver-bluetooth-sm-l330nzs1asa/)
4. [Samsung Galaxy Watch 8 review, Android Authority](https://www.androidauthority.com/samsung-galaxy-watch-8-review-3590714/)
5. [Los Samsung Galaxy Watch8 son oficiales, Cinco Días (El País)](https://cincodias.elpais.com/smartlife/gadgets/2025-07-09/samsung-galaxy-watch8-oficiales-caracteristicas.html)
6. [Samsung Galaxy Watch8 review, TechRadar](https://www.techradar.com/health-fitness/smartwatches/samsung-galaxy-watch-8-review)
7. [Samsung Galaxy Watch8 Series User Guide (L325/L335/L505)](https://files.customersaas.com/files/UWzcNnctc8M2d1DGhn6RO9RJ.pdf)
8. [Galaxy Watch8 manual, Apps and features](https://www.watch.co.uk/download/galaxywatch8-manual-en-pdf/)
9. [Is the Galaxy Watch 8 the most comfortable smartwatch?, Android Central](https://www.androidcentral.com/wearables/samsung-galaxy-watch/samsung-galaxy-watch-8-review)
10. [Galaxy Watch8 review video, Mark's Tech (YouTube)](https://www.youtube.com/watch?v=Ms3OfjlI520)
11. [Samsung Galaxy Watch8 Japan release announcement, PR Times](https://prtimes.jp/main/html/rd/p/000000764.000030942.html)
12. [Health features on the Galaxy Watch8 and Watch8 Classic, Samsung UK](https://www.samsung.com/uk/support/mobile-devices/health-features-on-the-galaxy-watch8-and-watch8-classic/?msockid=209ce2147f1d695b0e77f46b7eb3682b)
13. [A First Look at the Galaxy Watch8 Series, Samsung Newsroom India](https://news.samsung.com/in/galaxy-unpacked-2025-a-first-look-at-the-galaxy-watch8-series-streamlining-sleep-exercise-and-everything-in-between)
14. [These are the 3 best Samsung smartwatches we've tested, Tom's Guide](https://www.tomsguide.com/best-picks/best-samsung-watch)
15. [Forget the Samsung Galaxy Watch 9: The Watch 8 is just as good, Tom's Guide](https://www.tomsguide.com/wellness/smartwatches/forget-the-samsung-galaxy-watch-9-the-watch-8-is-just-as-good-and-usd114-off-right-now)
16. [Meet the Samsung Galaxy Watch 8, the first Android smartwatch with Gemini AI built in](https://www.tomsguide.com/wellness/smartwatches/meet-the-samsung-galaxy-watch-8-the-first-android-smartwatch-with-gemini-ai-built-in)
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*Topic: Encyclopedia › Technology and the built world › Communications and everyday technology › Consumer electronics and devices › Smartphones and mobile devices*
*Initially written Sep 17, 2026 · Reviewed: Oct 15, 2026 · Edited: Oct 11, 2026; Oct 15, 2026; Oct 25, 2026 · Last review: Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license