Amazfit Helio Ring vs Oura Ring 4

At $199 with zero monthly subscription fees, the Amazfit Helio Ring is designed as an affordable sleep-and-recovery companion—especially for athletes who already wear an Amazfit Balance, Active 2, or T-Rex watch during workouts. The Zepp app seamlessly merges wrist workout load with overnight finger HRV, SpO2, and EDA stress readings, though standalone users will note its shorter 4-day battery life and limited three-size (8, 10, 12) lineup.

The Oura Ring 4 cements Oura's lead at the top of the smart ring category by replacing the Gen 3's raised interior epoxy domes with a fully titanium interior and recessed 0.3mm sensors powered by 18-path Smart Sensing PPG. Delivering up to 8 days of battery life and the industry's most refined sleep staging, daytime stress, and cardiovascular age insights, its only real drawback is the mandatory $5.99/month Oura Membership.