Oura Ring

Oura Ring 5 (2026) The most polished sleep and readiness insights here, in the slimmest body: Oura says it is 40% smaller than the Ring 4, at 2.28 mm thick and from 2 grams. Battery is rated at six to nine days. The catch is the real cost. Black and Silver are $399, other finishes $499, and the insights most people buy it for sit behind a $5.99 monthly or $69.99 yearly membership, so two years on the annual plan comes to about $540 for a base finish. Without it the ring still records, but the app shows far less. Sizes run 6 to 13, so check the sizing kit if your fingers fall outside that.