Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Amazfit - Helio Ring | Oura - Ring 4 |
|---|---|---|
| Battery life | 5 days | 8 days |
| Sport modes | 0 | 40 |
Between the Helio Ring and Ring 4, the Helio Ring comes out ahead in several specs, while the Ring 4 wins on battery life / sport modes. Overall, the Helio Ring scores 62 and the Ring 4 scores 63.8 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (62 vs 63.8). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
The Helio Ring does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the Ring 4 if you care most about battery life / sport modes. Its strongest claims are battery life, sport modes. The single most decisive one: Battery life — 60.00% more. 8 days vs 5 days.
Both ship with comparable gps, spo2, water resistance, 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: Amazfit - Helio Ring or Oura - Ring 4?
Oura - Ring 4 leads the current Mars Score by 1.8 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 Amazfit - Helio Ring if…
Amazfit - Helio Ring does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Oura - Ring 4 if…
Oura - Ring 4 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 Amazfit - Helio Ring wins
- No decisive advantages.
Why Oura - Ring 4 wins
- ▲Battery life — 60.00% more. 8 days vs 5 days.
- ▲Sport modes — 40.00 more. 40 vs 0.
Spec comparison
Fitness
| Spec | Amazfit - Helio Ring | Oura - Ring 4 |
|---|---|---|
| GPS | false | false |
| Heart rate | true | true |
| SpO2 | true | true |
| Sleep tracking | true | true |
| Sport modes | 0 | 40lead |
Battery
| Spec | Amazfit - Helio Ring | Oura - Ring 4 |
|---|---|---|
| Battery lifeⓘ | 5 days | 8 dayslead |
| Water resistanceⓘ | 10 ATM | 10 ATM |
Design
| Spec | Amazfit - Helio Ring | Oura - Ring 4 |
|---|---|---|
| Display size | 0 " | 0 " |
| Weight | 3.5 g | 3.3 glead |