Apple - Watch Ultra 3 vs Google - Pixel Watch 3 (45mm)
Between the Watch Ultra 3 and Pixel Watch 3 (45mm), the Watch Ultra 3 comes out ahead in battery life and peak brightness, while the Pixel Watch 3 (45mm) wins on weight. Overall, the Watch Ultra 3 scores 65.3 and the Pixel Watch 3 (45mm) scores 46.7 on our Mars Score.
Which should you buy?
The Watch Ultra 3 is the clear pick on raw spec strength, leading by 18.6 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 3 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are battery life, peak brightness, display size, among others.
Pick the Pixel Watch 3 (45mm) if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight.
Both ship with comparable ecg, cellular, spo2, so those specs don't separate the two — focus on the differences below.
Bottom line: the Watch Ultra 3 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 3 wins
- ▲Battery life — 100.00% more. 72 h vs 36 h.
- ▲Peak brightness — 50.00% more. 3000 nits vs 2000 nits.
- ▲Display size — 45.71% more. 2.04 " vs 1.4 ".
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Why Google - Pixel Watch 3 (45mm) wins
- ▲Weight — 25.00 g less. 37 vs 62.
Spec comparison
Design
| Spec | Apple - Watch Ultra 3 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| Case size | 49 mmlead | 45 mm |
| Weight | 62 g | 37 glead |
| Case material | titanium | aluminum |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Display
| Spec | Apple - Watch Ultra 3 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| Display size | 2.04 "lead | 1.4 " |
| Always-on display | true | true |
| Peak brightnessⓘ | 3000 nitslead | 2000 nits |
Health & Fitness
| Spec | Apple - Watch Ultra 3 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| ECG | true | true |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Apple - Watch Ultra 3 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| Battery life | 72 hlead | 36 h |
| GPS | true | true |
| Cellular | true | true |
| NFC | true | true |
| OS | watchOS | WearOSlead |
Frequently asked
Which has longer battery life, Watch Ultra 3 or Pixel Watch 3 (45mm)?+
Watch Ultra 3 lasts 72h vs 36h.
Do Watch Ultra 3 or Pixel Watch 3 (45mm) support ECG?+
Both support ECG.
Which has cellular, Watch Ultra 3 or Pixel Watch 3 (45mm)?+
Both offer cellular variants.
Spec-level deep dives
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