Between the Watch Ultra 2 and ScanWatch 2, the Watch Ultra 2 comes out ahead in display size and water resistance, while the ScanWatch 2 wins on battery life and weight. Overall, the Watch Ultra 2 scores 60.5 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 12.1 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 Ultra 2 if you care most about display size and water resistance. The biggest gaps in its favor are display size, water resistance, 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, weight.
Both ship with comparable ecg, spo2, 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 Ultra 2 wins
- ▲Display size — 204.76% more. 1.92 " vs 0.63 ".
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
- ▲Has Cellular.
- ▲Peak brightness: 3000 nits vs 0 nits.
Why Withings - ScanWatch 2 wins
- ▲Battery life — 1900.00% more. 720 h vs 36 h.
- ▲Weight — 2.40 g less. 59 vs 61.4.
Spec comparison
Design
| Spec | Apple - Watch Ultra 2 | Withings - ScanWatch 2 |
|---|---|---|
| Case size | 49 mmlead | 42 mm |
| Weight | 61.4 g | 59 glead |
| Case material | titanium | stainless steel |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Display
| Spec | Apple - Watch Ultra 2 | Withings - ScanWatch 2 |
|---|---|---|
| Display size | 1.92 "lead | 0.63 " |
| Always-on display | truelead | false |
| Peak brightnessⓘ | 3000 nitslead | 0 nits |
Health & Fitness
| Spec | Apple - Watch Ultra 2 | Withings - ScanWatch 2 |
|---|---|---|
| ECG | true | true |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Apple - Watch Ultra 2 | Withings - ScanWatch 2 |
|---|---|---|
| Battery life | 36 h | 720 hlead |
| GPS | truelead | false |
| Cellular | truelead | false |
| NFC | truelead | false |
| OS | watchOS | Withings OSlead |
Frequently asked
Which has longer battery life, Watch Ultra 2 or ScanWatch 2?+
ScanWatch 2 lasts 720h vs 36h.
Do Watch Ultra 2 or ScanWatch 2 support ECG?+
Both support ECG.
Which has cellular, Watch Ultra 2 or ScanWatch 2?+
Watch Ultra 2 offers a cellular variant; ScanWatch 2 is Wi-Fi only.
Spec-level deep dives
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