Smart Rings / Amazfit
Amazfit Helio Ring (2024)
$150 and a real stress sensor, but it comes in three sizes and lasts four days.
Overall score 6.5/10
Pros
- + $149.99 with no subscription — the cheapest ring here from a manufacturer with a real wearables business behind it
- + An actual EDA sensor for stress rather than an HRV-derived guess
- + 10ATM water rating matches rings costing twice as much
- + Zepp Aura Premium is bundled, not upsold
Cons
- − Three sizes, full stop — 8, 10 and 12. This is the single biggest reason to buy something else
- − Four-day battery is the worst here by a wide margin; RingConn's cheapest ring does ten
- − Amazfit's own page says no USB-C cable is in the box
- − Data is most useful if you already own an Amazfit watch; standalone the Zepp app is thinner than Oura's
- − The Helio Ring 2 has been confirmed for the second half of 2026, so this is end-of-cycle hardware
Amazfit Helio Ring (2024) review: what the specs say
$150 and a real stress sensor, but it comes in three sizes and lasts four days. At $149.99, Amazfit's 2024 model sits among the cheapest we cover — the smart Rings we compare run from $149.99 to $479. It scores 6.5/10 overall, calculated from published specifications across 8 categories rather than from a subjective impression.
Its strongest showing is Subscription Freedom at 9.5/10 — how much of the ring keeps working with no recurring payment — the category's defining trap. The weakest is Sizing & Fit at 3.0/10, which is the trade-off to weigh before buying: if that is the specification you care about most, one of the alternatives below will serve you better.
Worth knowing before you buy: three sizes, full stop — 8, 10 and 12. This is the single biggest reason to buy something else; and four-day battery is the worst here by a wide margin; RingConn's cheapest ring does ten. Every specification on this page comes from Amazfit's own documentation or a verified retail listing — where a figure is not published, the table says so rather than estimating it.
Specifications and price last verified . Report an error
Full Specifications
| Battery Life (claimed) | 4 days |
| Battery, In Practice | Amazfit publishes 'up to 4 days' — the shortest claim in this comparison, and it is the headline figure, so continuous SpO2 and temperature sensing pull it down from there. Wireless charging takes about 1 hour 40 minutes. |
| Subscription | None. Amazfit states no subscriptions are required, and Zepp Aura Premium (sleep sounds, detailed sleep reports, AI chat) is included free rather than sold separately. |
| 3-Year Cost of Ownership | 149.99 $ |
| Sizes Offered | Three sizes only — 8 (24mm), 10 (25.7mm) and 12 (27.3mm). If your finger falls between them, there is no ring for you; every rival here offers seven to twelve sizes. |
| Sizing Kit | Not offered in the way rivals do it — with only three sizes Amazfit publishes inner diameters instead. That removes the kit wait but makes a poor fit far more likely. |
| Returns & Size Exchange | Not published on Amazfit's US product page; the store's standard terms apply and should be checked before ordering. |
| Measured vs Inferred | PPG optical sensor for heart rate and blood oxygen, plus a genuine EDA (electrodermal activity) sensor for stress — one of the few rings here where 'stress' has a dedicated sensor behind it rather than being inferred from HRV alone. Readiness and sleep scores are still derived. |
| FDA Clearance | None published. General wellness product; the EDA sensor is not a cleared medical measurement. |
| Water Rating | 10ATM |
| Phone Support | iOS and Android through the Zepp app |
| Charger & Data Export | Wireless charging dock, and Amazfit's own US page states the USB-C cable is not included in the box — you supply your own. Export: not published by the manufacturer. |
| Connectivity | Bluetooth (version not published by Amazfit) |
| Material | Skin-friendly titanium alloy |
| Warranty | 12 months |
Compare Amazfit Helio Ring (2024) With
Premium Alternative
Renpho LYNX Smart Ring (2025) — $179.99