Circular Ring 2: World’s Most Advanced Health Tracking Ring

Circular Ring 2, from France's Circular, is a second-generation smart ring pitched as the most advanced health tracker of its kind: 140+ biomarkers and 13+ health features spanning sleep, recovery, activity and heart rhythm, with AI turning raw data into actionable advice instead of just charts. Its other defining stance is zero subscription fees: while most smart rings lock premium features behind monthly paywalls, Circular goes buy-once. Seven days of battery with a wireless charging case, plus an ultra-light body designed to disappear on your finger. With 13,695 backers, the campaign carved out a position in an Oura-dominated category with a simple combination: the most complete metrics, no subscription.