This is the classic “cheap alternative to Oura” question. The Amazfit Helio Ring is $199 with no subscription; the Oura Ring 4 is the accuracy-and-app reference but costs $349 plus a mandatory membership. One is the budget, own-it-outright pick; the other is the premium experience you keep paying for.
VERDICT: TIE
Budget vs reference. The Amazfit Helio Ring wins decisively on cost — $199, no subscription — and is light and comfortable. The Oura Ring 4 wins on accuracy, battery, app polish and fit range, at $349 plus ~$6/month. If money and no-subscription are the priority, Helio; if accuracy and experience are, Oura.
Helio: $199 one-time, no subscription. Oura Ring 4: $349 + ~$6/month. Over a couple of years the Helio costs a fraction as much.
Amazfit Helio Ring
Accuracy
Oura is the validated reference for sleep staging and overnight HRV. The Helio is decent for the price but a clear step behind.
Oura Ring 4
Battery
Oura Ring 4: ~6–8 days. Amazfit Helio: ~2.5–3 days real-world. Oura lasts far longer between charges.
Oura Ring 4
App & ecosystem
Oura’s app is the most polished and explanatory in the category with wide integrations; the Zepp app is capable but plainer.
Oura Ring 4
Fit & sizing
Oura offers a full size range with a sizing kit. The Helio has only three sizes (8, 10, 12), so many people can’t fit it well.
Oura Ring 4
Comfort & weight
The Helio is exceptionally light (<4g) and thin — marginally more comfortable to sleep in than the Ring 4, if it fits.
Amazfit Helio Ring
Choose Amazfit Helio Ring
Choose the Amazfit Helio Ring if you want the cheapest subscription-free ring with decent sleep tracking, and one of its three sizes fits you.
Choose Oura Ring 4
Choose the Oura Ring 4 if you want the most accurate sleep and HRV, the best app and longer battery, and the membership is acceptable.
The short version
The classic cheap-vs-reference ring choice. The Amazfit Helio Ring is $199 with no subscription; the Oura Ring 4 is the accuracy-and-app leader at $349 plus a membership.
When the Amazfit Helio Ring is the right pick
You want the cheapest subscription-free ring with decent sleep tracking, and a size fits you.
When the Oura Ring 4 is the right pick
Accuracy, battery, app polish and fit range matter more than price, and the membership is acceptable.
Is the Amazfit Helio Ring a good cheap alternative to Oura?
For the price, yes — $199 with no subscription gets you decent sleep and HRV tracking. But Oura is more accurate, lasts longer per charge, has the better app and fits more fingers. The Helio is the budget pick; Oura is the reference you pay a subscription for.
How much cheaper is the Helio over time?
A lot. The Helio is $199 once. The Oura Ring 4 is $349 plus about $6/month, so after two years Oura runs roughly $490+ versus the Helio’s $199 — before any Oura hardware upgrade.
Is the Helio accurate enough?
For general sleep and recovery trends, it’s reasonable (sleep tracking is its strongest area). If you want the most accurate HRV and sleep data, Oura still leads — but you pay for it up front and monthly.