Amazfit Helio Ring vs Circular Ring Slim
Amazfit Helio Ring ($299) vs Circular Ring Slim ($259) — side-by-side specs, weight, pros and cons to help you pick the right smart ring.
Spec-by-spec
| Spec | Amazfit Helio Ring | Circular Ring Slim |
|---|
| Price | $299 | $259 |
| Weight | 3.8g | 4g |
| Battery | 3–4 days | 4–5 days |
| Sensors | PPG, Temp, Accel | PPG, ECG, Temp, SpO2 |
| Material | Titanium | Titanium |
| Sub | None | Optional (Kira AI) |
| WR | 5ATM | 5ATM |
| App | Zepp | — |
| Weight | — | 3.8g |
Pros & Cons
Amazfit Helio Ring
- Best readiness scoring in class
- Cross-device Amazfit integration
- No subscription
- Sleep coaching AI
- Trusted Zepp Health algorithms
- 3-4 day battery behind competitors
- Fewer sizes than Oura
- App less polished than Samsung
Circular Ring Slim
- ECG detection unique in this price
- No subscription base tier
- Kira AI coaching
- Slim 2mm profile
- 5ATM waterproof
- ECG not FDA-cleared
- Smaller company = support risk
- Kira AI coaching behind paywall
Circular Ring Slim is the better value at $259. If weight matters most, Amazfit Helio Ring carries lighter at 3.8g. Both are part of our curated smart ring index — tap through to check current pricing.