The femometer Smart Ring Gen2 packs continuous heart rate monitoring, sleep stage analysis, and cycle tracking into a ceramic ring that weighs next to nothing. Size 11 fits larger fingers comfortably, and the 1-inch display gives you quick stats without pulling out your phone. It runs Wear OS 3.0, which means the interface feels familiar and responsive.

The ring takes 1,400 temperature readings each night for BBT-based cycle tracking. That level of granularity helps identify ovulation windows with more precision than a standard thermometer. Sleep tracking breaks down Deep, Light, and REM stages alongside blood oxygen levels. The femometer app stores everything with no subscription fees, which is rare for this category.

Battery life is the trade-off here. The ring uses two included C batteries rather than a rechargeable cell. Wireless charging works, but you will replace batteries regularly with continuous use. The ceramic build feels premium on the wrist, though it lacks the ruggedness of titanium competitors. For someone who wants detailed health metrics without a bulky smartwatch, this ring delivers solid data in a discreet package.