Oura Ring Gen2

Oura Ring Gen2 is a ring from 2018, sitting in the mid-range band at an indicative $299. It is no longer sold new. It stays in this comparison because plenty of people are still wearing one.

It reads 14 of the 33 signals this comparison tracks. Nothing at all from body composition. Rarer readings it does take: sleep efficiency.

By sensor class: 7 at high accuracy and 5 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, a skin temperature sensor and an accelerometer.

Its 7 days per charge are the 3rd longest of the 7 devices of its kind here that publish a figure. Rated 100m / WR100, fine for swimming. Ring sizes US 6-13. An Oura Membership subscription is required to use it.

Legacy 2018; nighttime-only HR, no SpO2/daytime stress/VO2max/cardio-age; unsupported by current app.