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The Oura Ring is a wearable that is worn on a finger as a ring which tracks [[sleep]], [[activity]] and [[readiness]]. Since 2013 there have been three different versions of the ring, with the latest version (v3) being launched in November 2021. At the same time they changed their business model, requiring a monthly subscription for access to all metrics recorded.

The Oura Ring is a wearable that is worn on a finger as a ring which tracks [[Sleep tracking|sleep]], [[Activity tracking|activity]] and [[Readiness tracking|readiness]]. Since 2013 there have been three different versions of the ring, with the latest version (v3) being launched in November 2021. At the same time they changed their business model, requiring a monthly subscription for access to all metrics recorded.

While the sensor set of the rings have changed over the versions, generally they contain an [[accelerometer]], a [[Temperature Tracking|temperature sensor]] as well as an optical [[heart rate sensor]]. From these sensors the Oura calculates the following metrics:  

While the sensor set of the rings have changed over the versions, generally they contain an [[accelerometer]], a [[Temperature Tracking|temperature sensor]] as well as an optical [[heart rate sensor]]. From these sensors the Oura calculates the following metrics: