Oura Ring 3 Heritage

Oura Ring 3 Heritage is a ring from 2021, 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 18 of the 33 signals this comparison tracks. Nothing at all from body composition. Rarer readings it does take: cardiovascular age and sleep efficiency.

By sensor class: 6 at high accuracy and 9 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, an optical blood oxygen sensor, a skin temperature sensor and an accelerometer. Blood oxygen is measured through the night, not continuously through the day.

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. An Oura Membership subscription is required to use it.

Original Gen3 (Nov 2021); first Oura w/ SpO2 + daytime HR; discontinued.