Circular Ring 2

The only ring here that takes an ECG: a 40-second single-lead reading on demand, with signs of atrial fibrillation flagged. That makes it interesting for anyone who wants an occasional rhythm check without a watch, though Circular itself says it is not a diagnostic device. It lists at $349 in the US with no forced subscription, and the four-gram titanium band comes in four finishes. The weak spot is software: Tom's Guide and Reviewed both called the app buggy, and TechRadar said the software got in the way. Battery is rated up to seven days, less if you take frequent ECGs, so it suits a buyer who values the feature over polish.