Between the Band 7 and Ring 4, the Band 7 comes out ahead in battery life and sport modes, while the Ring 4 wins on water resistance. Overall, the Band 7 scores 73.1 and the Ring 4 scores 52.9 on our Mars Score.
Which should you buy?
The Band 7 is the clear pick on raw spec strength, leading by 20.2 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 Band 7 if you care most about battery life and sport modes. The biggest gaps in its favor are battery life, sport modes.
Pick the Ring 4 if you care most about water resistance. Its strongest claims are water resistance.
Both ship with comparable gps, spo2, so those specs don't separate the two — focus on the differences below.
Bottom line: the Band 7 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Amazfit - Band 7 wins
- ▲Battery life — 125.00% more. 18 days vs 8 days.
- ▲Sport modes — 80.00 more. 120 vs 40.
Why Oura - Ring 4 wins
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Spec comparison
Fitness
| Spec | Amazfit - Band 7 | Oura - Ring 4 |
|---|---|---|
| GPS | false | false |
| Heart rate | true | true |
| SpO2 | true | true |
| Sleep tracking | true | true |
| Sport modes | 120lead | 40 |
Battery
| Spec | Amazfit - Band 7 | Oura - Ring 4 |
|---|---|---|
| Battery life | 18 dayslead | 8 days |
| Water resistanceⓘ | 5 ATM | 10 ATMlead |
Design
| Spec | Amazfit - Band 7 | Oura - Ring 4 |
|---|---|---|
| Display size | 1.47 "lead | 0 " |
| Weight | 28 g | 3.3 glead |
Spec-level deep dives
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