Between the Watch SE 3 and ScanWatch 2, the Watch SE 3 comes out ahead in display size and weight, while the ScanWatch 2 wins on battery life and ecg. Overall, the Watch SE 3 scores 56.1 and the ScanWatch 2 scores 72.6 on our Mars Score.
Which should you buy?
The ScanWatch 2 is the clear pick on raw spec strength, leading by 16.5 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Watch SE 3 if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are display size, weight, cellular, among others.
Pick the ScanWatch 2 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. Its strongest claims are battery life, ecg, spo2.
Both ship with comparable water resistance, so those specs don't separate the two — focus on the differences below.
Bottom line: the ScanWatch 2 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Apple - Watch SE 3 wins
- ▲Display size — 182.54% more. 1.78 " vs 0.63 ".
- ▲Weight — 26.00 g less. 33 vs 59.
- ▲Has Cellular.
- ▲Peak brightness: 1000 nits vs 0 nits.
Why Withings - ScanWatch 2 wins
- ▲Battery life — 3900.00% more. 720 h vs 18 h.
- ▲Has ECG.
- ▲Has SpO2.
Spec comparison
Design
| Spec | Apple - Watch SE 3 | Withings - ScanWatch 2 |
|---|---|---|
| Case size | 44 mmlead | 42 mm |
| Weight | 33 glead | 59 g |
| Case material | aluminum | stainless steel |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Apple - Watch SE 3 | Withings - ScanWatch 2 |
|---|---|---|
| Display size | 1.78 "lead | 0.63 " |
| Always-on display | false | false |
| Peak brightnessⓘ | 1000 nitslead | 0 nits |
Health & Fitness
| Spec | Apple - Watch SE 3 | Withings - ScanWatch 2 |
|---|---|---|
| ECG | false | truelead |
| SpO2 | false | truelead |
| Temperature sensor | false | truelead |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Apple - Watch SE 3 | Withings - ScanWatch 2 |
|---|---|---|
| Battery life | 18 h | 720 hlead |
| GPS | truelead | false |
| Cellular | truelead | false |
| NFC | truelead | false |
| OS | watchOS | Withings OSlead |
Frequently asked
Which has longer battery life, Watch SE 3 or ScanWatch 2?+
ScanWatch 2 lasts 720h vs 18h.
Do Watch SE 3 or ScanWatch 2 support ECG?+
ScanWatch 2 supports ECG; Watch SE 3 does not.
Which has cellular, Watch SE 3 or ScanWatch 2?+
Watch SE 3 offers a cellular variant; ScanWatch 2 is Wi-Fi only.
Spec-level deep dives
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