Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Apple - Watch Ultra 3 | Google - Pixel Watch 4 |
|---|---|---|
| Battery life | 72 h | 48 h |
| Display size | 2.04 " | 1.4 " |
| Weight | 62 g | 37 g |
| Water resistance | 10 ATM | 5 ATM |
Between the Watch Ultra 3 and Pixel Watch 4, the Watch Ultra 3 comes out ahead in battery life / display size, while the Pixel Watch 4 wins on weight. Overall, the Watch Ultra 3 scores 74.1 and the Pixel Watch 4 scores 69.8 on our Mars Score.
Which should you buy?
The Watch Ultra 3 edges ahead on the Mars Score (74.1 vs 69.8), but the 4.3-point gap is small enough that the right pick comes down to which spec advantages matter to you.
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, display size, water resistance. The single most decisive one: Battery life — 50.00% more. 72 h vs 48 h.
Pick the Pixel Watch 4 if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight. The single most decisive one: Weight — 25.00 g less. 37 vs 62.
Both ship with comparable ecg, cellular, spo2, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Apple - Watch Ultra 3 or Google - Pixel Watch 4?
Apple - Watch Ultra 3 leads the current Mars Score by 4.3 points.The more useful decision is the trade-off behind that result: compare display size, battery life against the way you will actually use the product.
Choose Apple - Watch Ultra 3 if…
Apple - Watch Ultra 3 has the measurable edge on battery life h, display size in, water resistance atm.
Choose Google - Pixel Watch 4 if…
Google - Pixel Watch 4 has the measurable edge on weight g.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Apple - Watch Ultra 3 wins
- ▲Battery life — 50.00% more. 72 h vs 48 h.
- ▲Display size — 45.71% more. 2.04 " vs 1.4 ".
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Why Google - Pixel Watch 4 wins
- ▲Weight — 25.00 g less. 37 vs 62.
Spec comparison
Design
| Spec | Apple - Watch Ultra 3 | Google - Pixel Watch 4 |
|---|---|---|
| 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 4 |
|---|---|---|
| Display size | 2.04 "lead | 1.4 " |
| Always-on display | true | true |
| Peak brightnessⓘ | 3000 nits | 3000 nits |
Health & Fitness
| Spec | Apple - Watch Ultra 3 | Google - Pixel Watch 4 |
|---|---|---|
| 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 4 |
|---|---|---|
| Battery lifeⓘ | 72 hlead | 48 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 4?+
Watch Ultra 3 lasts 72 hours vs 48 hours.
Do Watch Ultra 3 or Pixel Watch 4 support ECG?+
Both support ECG.
Which has cellular, Watch Ultra 3 or Pixel Watch 4?+
Both offer cellular variants.