Editorial review
The real-world take
Oura Ring 4 is a fully titanium smart ring built around Smart Sensing, which adapts to your finger to deliver accurate, continuous health data. It tracks sleep stages, heart rate, HRV, blood oxygen, temperature trends, activity, and stress, with a 5-8 day battery and 100m water resistance that make 24/7 wear practical. The recessed sensors and non-allergenic interior are designed for all-day comfort, and the ring is available in multiple finishes. Full insights require an Oura Membership at $5.99/month or $69.99/year, and the device is FSA/HSA eligible.