Circular Ring 2 vs Circular Ring 3

Both are subscription-free titanium smart rings from Circular. The Ring 3 is the better all-round pick: thinner, lighter-feeling, up to 12 days of battery, a two-segment Adaptive Fit design, and a fuller sleep and recovery suite. The Ring 2 is the one to consider if a single-lead ECG matters most to you, since ECG is its headline feature and it is rated IP68 with 50 m water resistance. Owners praise the no-screen, no-buzz design of both; the Ring 3 carries a 4.8 out of 5 rating from 82 ratings.

• Choose the Circular Ring 2 if you want a titanium ring with ECG as its core feature and a charging case included in the box.
• Choose the Circular Ring 3 if you want the thinner, longer-lasting ring with Adaptive Fit, deeper sleep tracking and HRV biofeedback breathing.