Smart Rings
Finger-worn sleep and health trackers compared on the specs that decide daily life with one: how many days it runs per charge, how many grams sit on your finger, how deep you can take it underwater, whether the app costs money forever, whether the charger holds a reserve, and what the shell is made of.
 Amazfit Helio Smart Ring | 4.8 Cheap and reasonably accurate, but testers got about 2.5 days rather than four, it comes in three sizes, and has no vibration. | 4 days | 3.75 g | 100 m | Titanium | ||
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 Circular Ring 2 | 1.8 Backers say promised blood pressure and glucose features went behind in-app purchases, software stayed rough, and the French parent went into liquidation. | 7 days | 3 g | 50 m | Titanium | ||
 CUDIS 002 Classic Ring | 4.0 Charges Oura money without the platform, the crypto rewards are unavailable in most countries, and heart rate readings ran inconsistent in testing. | 10 days | 3 g | 50 m | Titanium | ||
 Leep Health Leep Ring 1 | 5.8 Undercuts Oura at $199 with a long-reserve case, but it is heavy, only 50 m rated, and the brand is unproven. | 8 days | 4.3 g | 50 m | Titanium | ||
 Movano Health Movano Evie Ring | 4.2 The clinical engineering behind it is genuine, but 1 m water resistance and four-day battery break the whole never-take-it-off premise. | 4 days | 3.45 g | 1 m | Zirconium alloy (Liquidmetal) | ||
 Oura Ring 4 | 6.8 Still an accurate, well-supported sleep tracker, but the Ring 5 makes it look bulky and the subscription applies just the same. | 8 days | 4.3 g | 100 m | Titanium | ||
 Oura Ring 4 Ceramic | 5.5 The heaviest ring here by a wide margin, and the ceramic buys scratch resistance rather than any better data, on top of the subscription. | 8 days | 6.6 g | 100 m | Titanium + ceramic | ||
 Oura Ring 5 | 7.8 Smallest, lightest ring made and the best sleep platform, but you pay $399 then keep paying monthly, and workout tracking is poor. | 9 days | 2.3 g | 100 m | Titanium | ||
 RENPHO Lynx Smart Ring | 5.2 Four hands-on reviews back the real battery and the no-fee app, but testers found step counts and sleep stages unreliable, and the build reads thick. | 7 days | 4.5 g | 50 m | Titanium | ||
 RingConn Gen 2 | 8.7 Older, cheaper and still does twelve verified days at 2.5 grams with a case that holds months of reserve, no fee attached. | 12 days | 2.5 g | 100 m | Titanium | ||
 RingConn Gen 2 Air | 7.8 The cheapest competent ring here: ten days, 100 m and a brand with a real track record, minus the reserve case. | 10 days | 3.25 g | 100 m | Stainless steel | ||
 RingConn Gen 3 | 9.2 Reviewers actually got the rated two weeks out of it, the case and haptics are included, and nothing is owed after checkout. | 14 days | 3 g | 100 m | Titanium | ||
 Samsung Galaxy Ring | 6.5 Light, subscription-free and well built, but Android-only, quietly stalled with no successor until 2027, and named in Oura's US import case. | 7 days | 2.8 g | 100 m | Titanium | ||
 Ultrahuman Ring AIR | 4.5 Blocked from US import after losing Oura's patent case, and reviewers found step counts and workout heart rate unreliable anyway. | 6 days | 3 g | 100 m | Titanium | ||
 Ultrahuman Ring PRO | 6.2 The 15-day claim is the best in the category, but it is $479, barely shipping, and Ultrahuman's accuracy record is uneven. | 15 days | 4.1 g | 100 m | Titanium |
How the AI score works, and who wrote it
A language model rated these, not a test lab. Every score from 1 to 10 is an AI assessment of how good the product is against the other 15 in this comparison, formed from the specifications we verified plus the published lab reviews and owner reception found while researching each one. Nobody at Slopsheets listened to, wore or plugged in any of it.
It weighs the things a spec table cannot show: how a product is actually reviewed, how well the software works, build quality, and what you get for the money. That is deliberate. An earlier version of this column was pure arithmetic on the table and it ranked a bundle of cheap boxes above a class-leading single unit, because counting hardware is not the same as judging it.
Treat it as an informed starting point and read the sourced comparison, not as a verdict. The score is relative to this comparison only, so it means nothing across categories, and it carries no price, star rating or review count. Every specification behind it is sourced and checked; the score on top of them is opinion.