Ultrahuman Ring Air

A treat for anyone who dislikes wrist wearables: light, accurate, subscription-free tracking, with downsides of no auto exercise detection, slow charging and a fixed fit.

Brilliant tech that offers deep sleep, recovery and women's health insights for data fans, but costly and not worthwhile if you are already overwhelmed by data.

Comfortable and unobtrusive ring with detailed, well-explained sleep and fitness data and no required subscription, though pricey and with battery longevity concerns.

A strong smart ring close to the Oura in software and hardware, with solid sleep tracking and no subscription, though battery falls short of claims and workout tracking is weak.

Offers detailed sleep and stress tracking and a great free app without subscription, but slow syncing, inconsistent heart rate and pushy notifications keep it behind the Oura.

A very comfortable ring that tracks sleep and heart health consistently with good battery, but the app is confusing, notifications nag and fitness tracking is imperfect.

Comfortable, discreet and subscription-free with good sleep and recovery insights, but weak at workout tracking and redundant if you already own a good running watch.

An excellent sleep tracker with thoughtful prompts that is well recommended if you can tolerate its chunky black look, though workout tracking is poor.

A light, comfortable ring with actionable suggestions and no subscription, but slow charging, modest battery and a jargon-heavy cluttered app make it best for tinkerers.