A genuinely cheap, subscription-free ring with decent sleep and HRV tracking — but only three sizes and a short real-world battery keep it a budget pick, not an Oura rival.
Best for a cheap, subscription-free ring with solid sleep tracking — if one of its three sizes fits you and you accept a short battery.
The Amazfit Helio Ring is Zepp Health’s budget entry into the smart-ring space: a light titanium ring at $199 with no subscription for core metrics. It tracks heart rate, HRV (RMSSD), blood oxygen, skin temperature and sleep, syncing to the cross-platform Zepp app. Sleep tracking is respectable for the price, and being subscription-free at $199 makes it one of the cheapest capable rings. But it ships in just three sizes (8, 10, 12), so many people can’t get a proper fit, and real-world battery is only about 2.5–3 days — well short of Oura and RingConn.
How we tested: Evidence-based assessment — scored from Amazfit specifications and independent 2026 reviews. Not hands-on tested by ONDA.
Continuous HRV via RMSSD for recovery/readiness. Reasonable for a budget ring, but not validated to the level of Oura.
Sensor and signal quality
6.5
Optical HR, SpO2 and skin-temperature sensors in a light titanium shell. Budget-tier optics; a clean signal at rest.
Sleep tracking accuracy
7.5
The strongest area — roughly 85–95% agreement vs polysomnography in third-party checks. Genuinely good sleep tracking for the price.
Data access and export
6.0
Data lives in the Zepp app with basic export; no truly open API.
Wearability and battery
6.0
Very light (<4g) and thin (2.6mm), comfortable to sleep in — but only three sizes (8, 10, 12) means many fingers can’t get a proper fit, and real-world battery is only ~2.5–3 days.
App and software experience
6.5
The Zepp app (iOS + Android) gives sleep scores, readiness and basic workout summaries. Capable but less polished and explanatory than Oura.
Value
8.0
$199 one-time with no subscription is genuinely cheap for a capable ring — the standout reason to buy, provided one of the three sizes fits you.
Pros
+Just $199 with no subscription for core metrics
+Light, thin titanium — comfortable to sleep in
+Respectable sleep tracking (~85–95% vs PSG)
+Cross-platform Zepp app (iOS and Android)
Cons
−Only three sizes (8, 10, 12) — many people can’t get a good fit
−Short real-world battery (~2.5–3 days)
−Budget sensors; accuracy below Oura
−Zepp app less polished; no open API
Price: $199 one-time; no subscription for core metrics (as of 2026-09-06)
Where it leads
The Amazfit Helio Ring’s pitch is simple: a capable smart ring for $199 with no subscription. It is light titanium, comfortable to sleep in, and tracks HRV (RMSSD), heart rate, SpO2, skin temperature and sleep, all synced to the cross-platform Zepp app. Sleep tracking in particular punches above the price. For a subscription-free ring at this cost, that is a real value proposition.
Where it falls short
Two things hold it back. First, it ships in only three sizes (8, 10, 12), so a large share of people simply can’t get a proper fit — and fit is everything for optical accuracy and comfort. Second, real-world battery is only about 2.5–3 days, well behind Oura (6–9) and RingConn (~12). The sensors are budget-tier, and the Zepp app, while capable, is less polished and explanatory than Oura’s.
Who it is for
Choose the Amazfit Helio Ring if you want the cheapest capable, subscription-free ring and one of its three sizes fits you. If you need a wider size range, longer battery or the best accuracy, look at the RingConn Gen 2 (value, ~12-day battery), the Samsung Galaxy Ring, or Oura if you accept its subscription.
Background reading
The science behind why HRV is the signal worth tracking.
