Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Google - Charge 6 | Oura - Ring 4 |
|---|---|---|
| Battery life | 7 days | 8 days |
| Water resistance | 5 ATM | 10 ATM |
| GPS | true | false |
Between the Charge 6 and Ring 4, the Charge 6 comes out ahead in gps, while the Ring 4 wins on battery life / water resistance. Overall, the Charge 6 scores 77.4 and the Ring 4 scores 63.8 on our Mars Score.
Which should you buy?
The Charge 6 is the clear pick on raw spec strength, leading by 13.6 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 Charge 6 if you care most about gps. The biggest gaps in its favor are gps. The single most decisive one: Has GPS.
Pick the Ring 4 if you care most about battery life / water resistance. Its strongest claims are battery life, water resistance. The single most decisive one: Battery life — 14.29% more. 8 days vs 7 days.
Both ship with comparable sport modes, spo2, so those specs do not separate the two — focus on the differences below.
Bottom line: the Charge 6 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Google - Charge 6 or Oura - Ring 4?
Google - Charge 6 leads the current Mars Score by 13.6 points.The more useful decision is the trade-off behind that result: compare battery life, gps against the way you will actually use the product.
Choose Google - Charge 6 if…
Google - Charge 6 has the measurable edge on has gps.
Choose Oura - Ring 4 if…
Oura - Ring 4 has the measurable edge on battery days, water resistance atm.
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 Google - Charge 6 wins
- ▲Has GPS.
Why Oura - Ring 4 wins
- ▲Battery life — 14.29% more. 8 days vs 7 days.
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Spec comparison
Fitness
| Spec | Google - Charge 6 | Oura - Ring 4 |
|---|---|---|
| GPS | truelead | false |
| Heart rate | true | true |
| SpO2 | true | true |
| Sleep tracking | true | true |
| Sport modes | 40 | 40 |
Battery
| Spec | Google - Charge 6 | Oura - Ring 4 |
|---|---|---|
| Battery lifeⓘ | 7 days | 8 dayslead |
| Water resistanceⓘ | 5 ATM | 10 ATMlead |
Design
| Spec | Google - Charge 6 | Oura - Ring 4 |
|---|---|---|
| Display size | 1.04 "lead | 0 " |
| Weight | 37 g | 3.3 glead |