Reviews.

Amazfit Helio Ring review: no subscription, ~£279 UK price, 4-day battery, integrates with Zepp app. Honest comparison vs Oura, Ultrahuman, RingConn.

Editorial review of the Samsung Galaxy Ring — UK pricing, no subscription, deep Galaxy-phone integration, and the iOS gap to watch before buying.

Research-led RingConn Gen 2 review — UK pricing, sleep accuracy versus Oura and Ultrahuman, 10-day battery, and whether the value pick is the smart pick.

Research-led Ultrahuman Ring Air review — UK pricing, sleep and HRV accuracy versus Oura, the no-subscription angle, and who should buy it.

Research-led Oura Ring 4 review — UK pricing, total first-year cost with membership, sleep and HRV accuracy versus rivals, and who should buy it.