Fitness rings comparison · Maker specs
Amazfit Helio Ring vs Oura Ring 5
Quick Answer
Get Amazfit Helio Ring if you wear a size 8, 10 or 12: at $149.99 it costs less than half as much as Oura Ring 5, and Amazfit says it needs no subscription. Get Oura Ring 5, from $399, for sizes 6 to 13, a slimmer ring and typically 6–9 days of battery against Helio's 4; its full app needs Oura Membership, $5.99 a month or $69.99 a year.
The verdict
Buy Amazfit Helio Ring if one of its three sizes fits and price matters most; buy Oura Ring 5 if you want more battery, more sizes and a slimmer ring, and you'll pay for the membership.
Why: Both track sleep, heart rate and temperature, and both work with iPhone or Android, so it comes down to cost, fit and battery. Helio is the bulkier ring, 8 millimeters wide and 2.6 thick against 6.09 and 2.28, and it adds an EDA sensor and a gyroscope. Oura's catch is the fee: without membership its app shows little beyond three daily scores.
Buy Amazfit Helio Ring if
You're a size 8, 10 or 12, want a ring for less than half Oura's price with no required subscription, and don't mind charging every few days, especially if you already use an Amazfit watch.
Buy Oura Ring 5 if
You're between Helio's sizes or outside them, you want most of a week between charges, you wear your ring in the sauna, and you'll pay for Oura Membership.
On paper these two do the same job: a titanium-shelled ring that tracks your sleep stages, heart rate and skin temperature and reports to an app on iPhone or Android. Helio has two sensors Oura doesn’t list for Ring 5, an EDA (electrodermal activity) sensor and a gyroscope, but it’s also the one you have to take off before a sauna.
Amazfit Helio Ring and Oura Ring 5 side by side
| Spec | Amazfit Helio Ring | Oura Ring 5 |
|---|---|---|
| US price (19 Sep 2026) | $149.99 | From $399 (Silver, Black); $499 for four other finishes |
| Subscription | None required, says Amazfit; readiness insights need Zepp Aura | Oura Membership for the full app: $5.99 a month or $69.99 a year |
| Sizes | 8, 10 and 12 only | 6–13 |
| Width and thickness | 8 mm wide, 2.6 mm thick | 6.09 mm wide, 2.28 mm thick; 0.7 mm sensor dome |
| Weight | 3.65 g, 3.75 g or 3.82 g by size | From 2 g by size |
| Materials | Titanium alloy outside, resin inside | Titanium inside and out, superhard PVD; non-allergenic inner shell |
| Battery | Up to 4 days | Typically 6–9 days |
| Battery capacity | 16.5, 18.5 or 20.5 mAh by size | Not published |
| Charging | Wireless, about 1 hour 40 minutes | About 80 minutes |
| In the box | Ring, wireless charger, manual; no USB-C cable | Ring, size-specific charger, USB-C cable; no power adapter |
| Data stored on the ring | Not published | Up to 3 days |
| Water | 10 ATM (100 m), ISO 22810:2010; remove for hot showers and saunas | 100 m and IP68; sauna allowed |
| Sensors | PPG (one dual-color LED, two photodetectors), temperature, EDA, 3-axis accelerometer, 3-axis gyroscope | Two triple LEDs, two photodetectors, temperature, accelerometer |
| Phones | Android 7.0 or later, iOS 14.0 or later | Android 11 or later with Google Play, iOS 16 or later; Bluetooth 5.0 |
Three sizes, or sizes 6 to 13
Helio comes in three sizes, 8, 10 and 12, which Amazfit gives as finger circumferences of 60.3, 66 and 71.3 millimeters. There are no half sizes and no 6, 7, 9, 11 or 13 to 15, so if your finger falls between Helio’s sizes there’s no closer fit. The only US finish is Titanium.
Oura Ring 5, announced 28 May 2026, comes in sizes 6 to 13, measured with its own white sizing kit; Oura says Ring 5 sizing is slightly different from its Ring 4. Neither ring comes in 4, 5, 14 or 15.
Helio is also the bigger ring: 8 millimeters wide and 2.6 thick, against 6.09 and 2.28 for Ring 5, which Oura says has 40 percent less volume than Ring 4. Amazfit lists Helio at 3.65, 3.75 and 3.82 grams by size, then says about 3.8 and about 4 grams in its fine print, so its own figures don’t quite agree. Oura lists Ring 5 from 2 grams.
Battery: up to 4 days against 6 to 9
Amazfit rates Helio for up to 4 days of typical use, measured with heart rate and stress checked every 10 minutes, assisted sleep tracking on, and sleep breathing quality and blood oxygen off, so turning blood oxygen on takes you outside the conditions Amazfit tested. The battery is 16.5, 18.5 or 20.5 milliamp-hours depending on size, and a full wireless charge takes about 1 hour 40 minutes from empty. The box has the ring, the wireless charger and a manual, but no USB-C cable.
Oura rates Ring 5 for typically 6 to 9 days and says size, settings, activity and battery age all affect it. It charges in about 80 minutes, and the box has a size-specific charger and a USB-C cable but no power adapter. An optional charging case, sold separately, holds up to a month of charge and puts a full day back in about 10 minutes, Oura says.
The two ratings come from different tests, so treat the gap as a guide rather than a measurement. Ring 5 also stores up to three days of data on the ring; Amazfit doesn’t say how much Helio holds.
What the app costs after you buy the ring
Amazfit says Helio needs no subscription and gives Helio owners Zepp Aura Premium free, including custom sleep sounds, weekly and monthly sleep reports and an AI chatbot. Its fine print adds that readiness insights require a Zepp Aura subscription, that Aura and Fitness memberships are offered to Zepp accounts in a list of countries that includes the US, and that the content isn’t medical advice. Amazfit gives no price for Aura.
Oura is upfront about its fee. Full sleep detail, around-the-clock heart rate, Stress, Heart Health, Women’s Health and blood oxygen need Oura Membership, which Oura’s terms, updated 8 September 2026, put at $5.99 a month or $69.99 a year in the US, with one free month for new members. The membership belongs to your account, not the ring. Without it, you get the Readiness, Activity and Sleep scores, plus battery, profile, settings and Explore.
Sensors and sleep tracking
Helio has a BioTracker PPG sensor with one dual-color LED and two photodetectors, a temperature sensor, an EDA sensor, a 3-axis accelerometer and a 3-axis gyroscope. It tracks sleep duration, light, deep and REM sleep, naps and a sleep score, and it can share data with some Amazfit watches in Zepp.
Ring 5 has two triple LEDs (red, green and infrared), two photodetectors, a temperature sensor and an accelerometer, and Oura cites 12 signal pathways. Its sleep analysis is part of the membership.
Neither ring is a medical device. Amazfit says Helio and the Zepp app can’t diagnose anything and are for reference only, and Oura says Ring 5 isn’t meant to diagnose, treat, cure, monitor or prevent any condition.
Phones and water
Both work with iPhone and Android, and neither needs a Samsung phone. Helio needs Android 7.0 or later or iOS 14.0 or later and connects over Bluetooth Low Energy; the manual for model A2321 lists Bluetooth 5.0. Ring 5 needs Android 11 or later with Google Play, or iOS 16 or later, on a phone with Bluetooth 5.0.
Water is where they part. Helio is rated 10 ATM, up to 100 meters under ISO 22810:2010, but Amazfit says to take it off for a hot shower or a sauna. Ring 5 is rated to 100 meters with IP68, and Oura allows saunas and water sports with it.
What they cost
Helio was $149.99 on Amazfit’s US store on 19 September 2026. Oura Ring 5 started at $399 in Silver and Black, and the other four finishes were $499; Oura’s store also showed euros at times that day, from €429. Oura Membership adds $69.99 a year if you pay annually.
Amazfit’s Helio page sometimes loads its Helio System watch marketing instead of the ring, so make sure you’re looking at the ring, and check both prices, before you buy.
Frequently asked questions
Does Amazfit Helio Ring need a subscription?
Mostly not. Amazfit says no subscription is required and gives Helio owners Zepp Aura Premium free, but its fine print says readiness insights need a Zepp Aura subscription. Oura Ring 5 is plainer about it: the full app needs Oura Membership, $5.99 a month or $69.99 a year after a free first month.
Will Helio fit if I'm between sizes 8, 10 and 12?
No. Helio comes only in 8, 10 and 12, with no half sizes and no 9 or 11 in between. If you're between them, Oura Ring 5's sizes 6 to 13 are more likely to include yours; size yourself with the Ring 5 kit before you order.
Can I wear either ring in a sauna?
Only Oura Ring 5. Amazfit says to take Helio off for a hot shower or a sauna. Oura allows saunas and water sports with Ring 5 but not diving, and its general advice allows swimming and recreational snorkeling but not scuba, or more than 12 hours underwater.
Which ring tracks more accurately?
Neither company gives you figures you can compare. Oura's store quotes 99 percent for heart rate and 95 percent for sleep staging, both from Oura's own validation, and Amazfit gives no accuracy figure for Helio. Both say their rings aren't medical devices.
Sources
- Amazfit US — Helio Ring product page and specs — accessed 2026-09-22
- Oura store — Ring 5 — accessed 2026-09-22
- Oura Member Care — Discover Oura Ring 5 — accessed 2026-09-22