Circular Ring 2

The most ambitious ring on paper, held back by software.

140+ biomarkers and on-paper ECG in a no-fee ring

ECG/AFib repeatedly failed in independent testing; ~2-day battery

Vora can ingest Circular’s data where it is reliable, filling the coaching gap its app leaves.

Resting HR, sleep duration and temperature track close to Oura in casual use, but exercise HR is unreliable, fragmented nights merge into one session, and the FDA-cleared ECG and AFib repeatedly failed to complete in testing.

Tom's Guide found sleep duration and temperature tracked similarly to Oura, but the ring 'often overestimates or underestimates heart rate' during exercise and struggled with fragmented sleep; TechRadar separately reported that ECG and AFib monitoring 'never fully worked' and kept getting stuck on a loading screen. Tom's Guide Circular Ring 2 review ↗

The widest metric list of any ring on paper, but several headline features are delayed or gated, so delivered breadth trails the marketing.

Blood pressure and blood glucose trend monitoring 'aren't available yet, and once released, will sit behind paywalls (Circular Coins micro-transactions),' on top of ECG and AFib that often would not run. CompareSmartRings Circular Ring 2 review ↗

Real-world results vary widely by mode and features, from roughly 6 to 8 days in lighter modes down to as little as 2 days with everything on, behind Oura's steadier 5 to 8 days.

The reviewer got 'two days maximum' versus Oura's '5-8 days,' while TechRadar measured roughly six days and Tom's Guide reached nearly eight days in the lighter power mode. Cleggy (CTO) hands-on review ↗

Light titanium that is barely noticeable on the finger, but it scratches easily and reviewers found it less comfortable for all-day, all-night wear than the best rings.

Android Central found the finish 'gets scratched and scuffed so easily' and that the ring is 'not comfortable to wear for extended periods' because interior sensors leave indentations in the finger, while the CTO review praised its 'barely noticeable weight.' Android Central review ↗

The app is the single biggest failure point across every review, with slow or failed syncing, a cluttered AI-driven UI, unsafe AI advice, and delayed or paywalled features.

TechRadar concluded the ring has 'excellent ideas but inconsistent execution,' with software 'a step behind the competition'; the CTO review hit a daily sync bug requiring an app restart each morning and an AI assistant recommending prescription-only melatonin. TechRadar review ↗

A genuinely subscription-free $349 entry price undercuts Oura's fee, but higher finishes cost more, future features may be paywalled with coins, and the shaky software erodes the deal.

Pricing runs GBP 280 / $349 / AU$497 for the black version, rising to $449 for silver and $549 for gold and rose gold, with no subscription, but delayed features are set to sit behind Circular Coins micro-transactions. TechRadar review (pricing tiers) ↗