Google - Pixel Watch 3 (45mm) vs Google - Pixel Watch 4
Between the Pixel Watch 3 (45mm) and Pixel Watch 4, the Pixel Watch 3 (45mm) comes out ahead in several specs, while the Pixel Watch 4 wins on peak brightness and battery life. Overall, the Pixel Watch 3 (45mm) scores 46.7 and the Pixel Watch 4 scores 47.4 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (46.7 vs 47.4). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.
The Pixel Watch 3 (45mm) doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
Pick the Pixel Watch 4 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 peak brightness, battery life.
Both ship with comparable ecg, display size, cellular, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Google - Pixel Watch 3 (45mm) wins
- No decisive advantages.
Why Google - Pixel Watch 4 wins
- ▲Peak brightness — 50.00% more. 3000 nits vs 2000 nits.
- ▲Battery life — 33.33% more. 48 h vs 36 h.
Spec comparison
Design
| Spec | Google - Pixel Watch 3 (45mm) | Google - Pixel Watch 4 |
|---|---|---|
| Case size | 45 mm | 45 mm |
| Weight | 37 g | 37 g |
| Case material | aluminum | aluminum |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Google - Pixel Watch 3 (45mm) | Google - Pixel Watch 4 |
|---|---|---|
| Display size | 1.4 " | 1.4 " |
| Always-on display | true | true |
| Peak brightnessⓘ | 2000 nits | 3000 nitslead |
Health & Fitness
| Spec | Google - Pixel Watch 3 (45mm) | 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 | Google - Pixel Watch 3 (45mm) | Google - Pixel Watch 4 |
|---|---|---|
| Battery life | 36 h | 48 hlead |
| GPS | true | true |
| Cellular | true | true |
| NFC | true | true |
| OS | WearOS | WearOS |
Frequently asked
Which has longer battery life, Pixel Watch 3 (45mm) or Pixel Watch 4?+
Pixel Watch 4 lasts 48h vs 36h.
Do Pixel Watch 3 (45mm) or Pixel Watch 4 support ECG?+
Both support ECG.
Which has cellular, Pixel Watch 3 (45mm) or Pixel Watch 4?+
Both offer cellular variants.
Spec-level deep dives
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