Best Smart Rings Compared: Oura Ring 5 vs RingConn Gen 3 vs Samsung Galaxy Ring vs Ultrahuman Ring Pro and More
We compare seven smart rings: Oura Ring 5, RingConn Gen 3, Samsung Galaxy Ring, Ultrahuman Ring Pro, RingConn Gen 2 Air, Circular Ring 2 and Amazfit Helio Ring. This guide shows which wins on battery life, size, subscription costs and health features, and which ring suits your needs.
| Product | Price | Rating | Best for |
|---|---|---|---|
| Oura Ring 5 Review | $399.00 | 4.0 / 5 | Smallest and lightest ring in this group, at 2 g to 2.69 g and 6.09 mm wide |
| RingConn Gen 3 | $349.00 | 4.0 / 5 | Best value here: $50 cheaper than Oura with no subscription |
| Samsung Galaxy Ring | — | 3.5 / 5 | Most advanced sleep features in the group, including snoring analysis |
| Ultrahuman Ring Pro Review | — | 4.0 / 5 | Longest battery life here, at up to 15 days plus 45 days from the case |
| RingConn Gen 2 Air Smart Ring Review | — | 3.5 / 5 | Thinnest ring in this group, at 2 mm |
| Circular Ring 2 | — | 2.5 / 5 | Only ring here with an ECG sensor and AFib detection |
| Amazfit Helio Ring | £269.00 | 3.5 / 5 | Positioned as the cheaper alternative to Oura and Samsung |
| Ring | Rating | Price | Subscription | Battery life | Weight | Thickness | Material | Standout |
|---|---|---|---|---|---|---|---|---|
| Oura Ring 5 | 4.0/5 | $399 | $5.99/month for anything beyond basic metrics | Up to 7 days | 2 g to 2.69 g | 2.23 to 2.28 mm (6.09 mm wide) | Titanium | Billed as the world's smallest smart ring |
| RingConn Gen 3 | 4.0/5 | $349 | None | 10 to 14 days (official) | Not listed | Not listed | Titanium | Apple Health and Google Health Connect, charging case |
| Samsung Galaxy Ring | 3.5/5 | Not listed | None | Up to 7 days (6 typical) | 3 g (size 12) | 2.6 mm (7 mm wide) | Titanium Grade 5 | AI sleep tracking with snoring analysis (Android only) |
| Ultrahuman Ring Pro | 4.0/5 | Not listed | Some metrics behind subscription or paid Power Plugs | Up to 15 days, plus 45 days from the case | 3.3 to 4.8 g | 2.65 mm (8.2 mm wide) | Not listed | 250 days of onboard storage, dual-core processor |
| RingConn Gen 2 Air | 3.5/5 | Not listed | None | Up to 10 days | As light as 2.5 g | 2 mm | Stainless steel | Slimmest ring in this group |
| Circular Ring 2 | 2.5/5 | Not listed | None for current features | 4 to 8 days by mode (5.5 days tested) | Not listed | Not listed | Titanium | ECG sensor with AFib detection, IP68 |
| Amazfit Helio Ring | 3.5/5 | £269 | None | 3 days | 4 g | 2.6 mm | Titanium alloy | Budget alternative with strong sleep and recovery tracking |
Price and Subscription Costs: Who Charges You Monthly?
Only three rings have published prices. The RingConn Gen 3 costs $349, which undercuts the Oura Ring 5 at $399. The Amazfit Helio Ring is listed at £269 and is positioned as the cheaper alternative to Oura and Samsung. Prices for the other four rings were not supplied.
Ongoing costs separate this group more sharply than upfront prices do. Oura needs a $5.99/month subscription for anything beyond basic metrics. The Ultrahuman Ring Pro also locks some metrics behind a subscription or paid Power Plugs add-ons. The RingConn Gen 3, RingConn Gen 2 Air, Samsung Galaxy Ring, Amazfit Helio Ring and Circular Ring 2 all work without a subscription. Circular's no-subscription promise covers only its current features.
Winner: RingConn Gen 3. It is cheaper than the Oura Ring 5 and has no subscription.
Battery Life: Ultrahuman Runs Away With It
The Ultrahuman Ring Pro lasts up to 15 days on a charge, and its charging case adds another 45 days of power. Nothing else in this group comes close. The RingConn Gen 3 comes second with an official 10 to 14 days, and it also includes a charging case. The RingConn Gen 2 Air reaches up to 10 days but charges only on a USB-C dock, with no portable case.
The Oura Ring 5 and Samsung Galaxy Ring both quote up to 7 days. Samsung says typical use gives 6 days. The Circular Ring 2 claims up to 8 days in Power mode, but it managed about 5.5 days in testing. The Amazfit Helio Ring comes last at around three days.
Winner: Ultrahuman Ring Pro, with RingConn Gen 3 as the runner-up.
Size, Weight and Comfort: Slim vs Chunky
For all-day comfort, the Oura Ring 5 and the RingConn Gen 2 Air lead the group. Oura is 40% smaller than the Ring 4, weighs 2 g to 2.69 g and is just 6.09 mm wide, making it the lightest ring here. The Gen 2 Air is the thinnest at 2 mm and weighs as little as 2.5 g. To get there, it uses stainless steel rather than titanium.
The Samsung Galaxy Ring is in the middle at 3 g and 7 mm wide. The Amazfit Helio Ring weighs 4 g and comes in only three sizes. The Ultrahuman Ring Pro is the bulkiest option, at 8.2 mm wide, 2.65 mm thick and up to 4.8 g. It pays for its battery lead in size.
Size choice also differs. RingConn Gen 3 offers sizes 6 to 15 in five finishes, and Samsung offers ten sizes in three titanium finishes. Amazfit's three sizes in a single colour are the most limited.
Winner: Oura Ring 5 for the smallest overall footprint. RingConn Gen 2 Air is the thinnest.
Health Tracking and Accuracy
The Circular Ring 2 is the only ring here with an ECG sensor and AFib detection. However, it also has the most serious problems: slow and unreliable syncing, app crashes, inaccurate exercise tracking and gaps in sleep data.
The RingConn Gen 3 offers the broadest listed set of metrics, including HRV, SpO2, skin temperature and stress, plus blood pressure trends. Those blood pressure figures are trends, not medical readings. Its exercise heart rate accuracy varies at higher intensities, and its vibration motor doesn't yet support notifications or alarms. The RingConn Gen 2 Air uses the same sensors as the standard Gen 2 but drops sleep apnea tracking.
For sleep, the Samsung Galaxy Ring stands out with AI-powered Sleep Score and snoring analysis. Its software is less deep than Oura's, though, and there are reports of spotty heart rate data and poor SpO2 tracking. The Amazfit Helio Ring also tracks sleep and recovery well, but its workout tracking is limited.
The Ultrahuman Ring Pro adds a dual-core processor with on-device machine learning and 250 days of onboard storage. The Oura Ring 5 offers deeper insights than Samsung, but its sports tracking lags behind even basic wearables.
Winner: RingConn Gen 3 for breadth without a paywall. Samsung and Amazfit are strongest on sleep.
Compatibility and Build
The Samsung Galaxy Ring is the only ring here that is Android only, so iPhone owners should look elsewhere. The RingConn Gen 3 connects to both Apple Health and Google Health Connect.
Most rings in this group use titanium. Oura adds a harder, more scratch-resistant coating, and Circular uses a PVD coating with an IP68 rating. The RingConn Gen 2 Air is the exception, with a stainless steel build.
Verdict: Which Smart Ring Should You Buy?
Best overall value: RingConn Gen 3. It costs $349, needs no subscription, lasts 10 to 14 days and tracks a broad set of metrics. It also works with iPhone and Android.
Best for comfort and polish: Oura Ring 5. It is the smallest and lightest ring here, with deeper insights than Samsung. Budget for the $5.99/month subscription, and don't buy it for sports tracking.
Best battery life: Ultrahuman Ring Pro. It lasts up to 15 days, its case adds 45 more, and it stores 250 days of data. In exchange, it is the chunkiest ring and some features cost extra.
Best for Android users focused on sleep: Samsung Galaxy Ring. You get AI sleep insights and snoring analysis with no subscription.
Best slim, no-subscription pick: RingConn Gen 2 Air. It is 2 mm thin and lasts up to 10 days, but it uses stainless steel and lacks sleep apnea tracking.
Best on a budget: Amazfit Helio Ring. It offers strong sleep and recovery tracking for less, as long as you can live with charging every three days.
Hard to recommend: Circular Ring 2. Its ECG and AFib detection are unique, but its software and syncing problems make it the weakest ring overall.
Oura Ring 5 Review
Pros
- + Smallest and lightest ring in this group, at 2 g to 2.69 g and 6.09 mm wide
- + Deeper software and insights than the Samsung Galaxy Ring
- + Tied for the top rating here at 4.0
Cons
- − Most expensive listed price, at $50 more than the RingConn Gen 3
- − Needs a $5.99/month subscription, unlike most rivals here
- − Battery life of up to 7 days trails the Ultrahuman and both RingConn rings
RingConn Gen 3
Pros
- + Best value here: $50 cheaper than Oura with no subscription
- + Second-best battery life at 10 to 14 days, behind only Ultrahuman
- + Widest size range listed (6 to 15) and works with both Apple Health and Google Health Connect
Cons
- − Vibration motor lacks notifications and alarms
- − Exercise heart rate accuracy varies at high intensity
- − Thickness and weight not listed, unlike its slimmer Gen 2 Air sibling
Samsung Galaxy Ring
Pros
- + Most advanced sleep features in the group, including snoring analysis
- + No subscription, unlike Oura and Ultrahuman
- + Lighter than the Ultrahuman and Amazfit rings, at 3 g
Cons
- − Only Android-only ring in this comparison
- − Shallower insights than the Oura Ring 5
- − Heart rate and SpO2 reports are weaker than the RingConn Gen 3's broad tracking
Ultrahuman Ring Pro Review
Pros
- + Longest battery life here, at up to 15 days plus 45 days from the case
- + 250 days of onboard storage, unmatched in this group
- + Only ring here with a dual-core processor and on-device machine learning
Cons
- − Bulkiest ring in the comparison, at 8.2 mm wide and up to 4.8 g
- − Some metrics are paywalled, unlike RingConn, Samsung and Amazfit
- − Described by reviewers as expensive relative to rivals
RingConn Gen 2 Air Smart Ring Review
Pros
- + Thinnest ring in this group, at 2 mm
- + Battery life of up to 10 days beats Oura, Samsung, Circular and Amazfit
- + No subscription, with the fastest listed charge time at 90 minutes
Cons
- − Only ring here made of stainless steel rather than titanium
- − No charging case, unlike the RingConn Gen 3 and Ultrahuman
- − Lacks the sleep apnea tracking of the standard Gen 2
Circular Ring 2
Pros
- + Only ring here with an ECG sensor and AFib detection
- + Only ring in the group with a listed IP68 rating
- + Tested battery life of 5.5 days beats the Amazfit's 3 days
Cons
- − Lowest-rated ring in the comparison, at 2.5
- − Least reliable syncing and app experience in the group
- − Exercise and sleep tracking are less reliable than rivals'
Amazfit Helio Ring
Pros
- + Positioned as the cheaper alternative to Oura and Samsung
- + No subscription, unlike Oura and Ultrahuman
- + Sleep and recovery tracking rivals Samsung's
Cons
- − Shortest battery life in the group, at about 3 days
- − Fewest sizes (3) and colours (1) here
- − Heavier than Oura, Samsung and the Gen 2 Air, at 4 g