Oura didn't kick off the smart ring category, but it's been consistently good at being among the best in the business. With ...

And I view it all, along with my health records and other measurements, right in the Apple Health app. But there’s one area in which my fitness tracking could be better — sleep. The Oura Ring ...

Data is then sent via Bluetooth to the Oura app on your phone, which translates it for you in the form of scores: “readiness”, “sleep” and “activity” range between zero and 100 ...