RingConn Gen 2 review: the no-subscription ring to beat

How this review was built

We haven't worn, owned or lab-tested a RingConn Gen 2. This review is built from RingConn's published specs, its subscription, warranty and protection-plan terms, a 2026 preprint that compared the ring with a chest strap, a sleep apnea meta-analysis, and reports from named reviewers. Every claim links to its source below.

On our published ring rubric (how we score), the Gen 2 scores 8.2 out of 10, the highest of the eight rings in our smart ring reviews. It gets full marks for cost of ownership because there's no fee, near-full marks for battery, sizing and phone support, and a middling 5 out of 10 for evidence, because its best study isn't peer-reviewed yet. That's also why it tops our best smart rings without a subscription.

What you pay over three years

The ring price, and nothing after it. RingConn's Gen 2 page says “No Subscriptions” and “Multi-dimensional health monitoring included.” Here's how that compares with the two alternatives on this page, one of which is an Oura.

For the full brand-by-brand picture of who charges what, see do smart rings require a subscription and what a smart ring really costs over three years.

What's locked without a plan

Nothing, because there isn't a plan. RingConn sells no paid tier on any of its three rings: the Gen 3 page says “No Subscription,” the Gen 2 page “No Subscriptions,” and the Gen 2 Air has no plan listed. Every feature RingConn advertises for the Gen 2, including its sleep apnea monitoring, is included in the purchase. For the anti-subscription buyer, that's the entire case, and it's why the fee column above reads $0 for as long as you own the ring.

Owning the ring outright doesn't settle where your data goes. That's a separate question from the fee, and we cover it brand by brand in smart ring data privacy.

What the evidence says

The Gen 2 is the only no-fee ring we found with a head-to-head comparison against a chest strap, and it comes with two big labels. Tao et al., a 2026 Research Square preprint, compared the ring with a chest-strap monitor in 64 shooting athletes during seated, 10-minute recordings after exercise (Tao et al.):

• Heart rate bias was -0.42 bpm, with limits of agreement from -0.74 to -0.09 bpm.
• HRV (RMSSD) bias was 1.62 ms, with much wider limits of agreement: -10.08 to 13.34 ms.

Reviewer reports fill in the rest. Gadgets & Wearables found that against a chest strap on runs, “the ring consistently reported higher values,” overestimating both average and max heart rate. At rest the picture was better: its resting heart rate correlated 98% with a WHOOP, and HRV 82% (Gadgets & Wearables). Put together: the Gen 2 looks solid for resting and overnight trends and unreliable for workout heart rate. That's its biggest real weakness, and it isn't unique to RingConn: Tech Advisor's ring reviewer wrote, “I've not tested a smart ring that I really think does a good job of tracking heart rate during exercise.”

By comparison, Oura's Gen 4 has a peer-reviewed, independently funded study against a Polar H10 (Dial et al., 2025). That gap is why the Gen 2 scores 5 on evidence and the Oura Ring 4 scores 9. If you want to close it for your own ring, our chest-strap test takes a week, and smart ring HRV vs chest strap lays every study side by side.

The sleep apnea claim

RingConn markets the Gen 2 as “The World's First Ultra-Thin Smart Ring With Sleep Apnea Monitoring,” with “Automatic sleep apnea monitoring” and a headline figure: “90.7% Sleep Apnea Monitoring Accuracy.” That 90.7% is RingConn's own figure. We treat it as a maker's claim.

The best independent context is a 2026 meta-analysis in the Journal of Translational Medicine (Jin et al.) that pooled 28 articles on 11 finger-worn devices, including two RingConn sleep apnea studies (Jin et al.). Its conclusion: rings are useful for tracking trends and as a triage tool for severe sleep apnea, not for diagnosis. We couldn't verify whether the authors of the two RingConn studies are affiliated with RingConn.

Battery, sizing and phones

Battery. RingConn claims “10-12 Days Battery Life, Extended Up to 150 Days With Charging Case.” The case is included, which changes how you live with a ring: you top it up from the case on the road instead of hunting for a cradle. Both numbers are RingConn's claims under its own conditions. Our smart ring battery life guide compares every brand's claim with what reviewers got, and chargers and charging cases covers the case itself.

Sizing. Sizes 6-14, with a complimentary sizing kit. RingConn says its ring sizes differ from standard rings, and that Gen 2 and Gen 2 Air share the same sizes; Gen 3 sizes differ again. No brand says its sizes match another brand's, so the honest answer to “is RingConn sizing the same as Oura?” is that no official equivalence exists. Use the kit. Our smart ring sizing guide walks through it, and smart ring sizing compared covers the cross-brand question.

Phones and build. iOS 17.0+ and Android 10.0+, which rules out older phones, so check yours first. It's rated IP68 (100 m / 328 ft) and made of what RingConn calls “Aerospace-Grade Titanium Alloy x Medical-Grade Epoxy Resin.” Because it works on iPhone, it's also our pick in the best smart ring for iPhone.

Warranty, HSA/FSA and US status

RingConn's standard warranty covers original components for one year outside the EEA (two years in the EEA), but “Routine battery replacement and normal capacity loss are not included.” The battery is sealed and “not designed for user replacement,” and RingConn runs a trade-in program for eligible devices (RingConn). In the US you can add optional 2- or 3-year Product Protection at checkout, and RingConn says “The battery is included as part of the overall device” under that cover. If you plan to keep the ring for years, that option is worth pricing; see our warranty and returns guide.

RingConn says Gen 2, Gen 2 Air and Gen 3 “can be purchased using HSA/FSA funds through Flex,” which works through a telehealth consultation; a clinician may issue a Letter of Medical Necessity if you have a qualifying condition. Check with your plan administrator.

On legal status: RingConn was a respondent in the ITC patent case Oura brought, and in October 2025 the two settled with a multi-year license, with royalties paid to Oura (RingConn). Before that, RingConn had said its US sales, deliveries and support were “operating as usual.” The Gen 2 is listed on Amazon.com. RingConn's own store showed it out of stock when we checked, which may only reflect the default size and color.

Who should skip it

• Runners and interval trainers who use heart rate zones. A reviewer found it read high against a chest strap on runs. Wear a strap for training; see the best chest strap for HRV.
• Anyone with an older phone. It needs iOS 17 or Android 10 or newer.
• Anyone who wants peer-reviewed proof for the exact ring on their finger. The Gen 2's study is a preprint; Oura's Ring 4 has the peer-reviewed one.
• Size 15. Gen 2 stops at 14; Gen 3 goes to 15.

The alternatives

RingConn Gen 3 is the newer model: up to 14 days a charge, a case RingConn rates at 150+ days, sizes 6-15, and new vascular and sleep apnea pattern insights. It has no study of its own yet and it showed out of stock on RingConn's store when we checked. Our RingConn Gen 3 review and Gen 3 vs Gen 2 lay out the trade. If you're also looking at the cheaper model, see Gen 2 vs Gen 2 Air.

Oura Ring 4 is the choice if evidence outweighs the fee: it's the ring generation in the best chest-strap study we found, but most of its insights need Oura's membership. The Oura vs RingConn comparison puts that fee next to the evidence. We also compare RingConn with the Galaxy Ring, with Ultrahuman, and all three big names in Oura vs RingConn vs Ultrahuman. Every ring is in the smart ring comparison chart.