Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Oura - Ring 4 | Samsung - Galaxy Fit 3 |
|---|---|---|
| Battery life | 8 days | 13 days |
| Sport modes | 40 | 100 |
| Water resistance | 10 ATM | 5 ATM |
Between the Ring 4 and Galaxy Fit 3, the Ring 4 comes out ahead in water resistance, while the Galaxy Fit 3 wins on battery life / sport modes. Overall, the Ring 4 scores 63.8 and the Galaxy Fit 3 scores 70.9 on our Mars Score.
Which should you buy?
The Galaxy Fit 3 edges ahead on the Mars Score (63.8 vs 70.9), but the 7.1-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Ring 4 if you care most about water resistance. The biggest gaps in its favor are water resistance. The single most decisive one: Water resistance — 5.00 ATM more. 10 vs 5.
Pick the Galaxy Fit 3 if you care most about battery life / sport modes. Its strongest claims are battery life, sport modes. The single most decisive one: Battery life — 62.50% more. 13 days vs 8 days.
Both ship with comparable gps, spo2, so those specs do not separate the two — focus on the differences below.
Bottom line: the Galaxy Fit 3 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: Oura - Ring 4 or Samsung - Galaxy Fit 3?
Samsung - Galaxy Fit 3 leads the current Mars Score by 7.1 points.The more useful decision is the trade-off behind that result: compare battery life against the way you will actually use the product.
Choose Oura - Ring 4 if…
Oura - Ring 4 has the measurable edge on water resistance atm.
Choose Samsung - Galaxy Fit 3 if…
Samsung - Galaxy Fit 3 has the measurable edge on battery days, sport modes.
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 Oura - Ring 4 wins
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Why Samsung - Galaxy Fit 3 wins
- ▲Battery life — 62.50% more. 13 days vs 8 days.
- ▲Sport modes — 60.00 more. 100 vs 40.
Spec comparison
Fitness
| Spec | Oura - Ring 4 | Samsung - Galaxy Fit 3 |
|---|---|---|
| GPS | false | false |
| Heart rate | true | true |
| SpO2 | true | true |
| Sleep tracking | true | true |
| Sport modes | 40 | 100lead |
Battery
| Spec | Oura - Ring 4 | Samsung - Galaxy Fit 3 |
|---|---|---|
| Battery lifeⓘ | 8 days | 13 dayslead |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Design
| Spec | Oura - Ring 4 | Samsung - Galaxy Fit 3 |
|---|---|---|
| Display size | 0 " | 1.6 "lead |
| Weight | 3.3 glead | 18.5 g |