The Oura Ring 4 measures many health values, offers a very high heart rate measurement accuracy and records quite a lot of activity data. Oura makes all this data available in the app together with some training material and a wide range of data interpretations such as daily form, sleep value, activity rating and stress value...

The Oura Ring 4 was fully convincing when tested and made it to number 1 on our best list. At the time of testing, no other smart ring can surpass the Oura in terms of features and operation. The sensors work reliably, both when measuring body functions and when tracking sports...

The Oura Ring 4 only offers the full scope with a plan. If you don't pay, you only get the daily analysis. The accurate heart rate measurement, good training recognition, detailed analysis and good sleep recording all speak in favour of paying. It would be nice to have a charging case to charge the ring without a cable.