If Apple did design an Apple Ring, it could potentially track heart rate, activity, sleep, and respiratory rate, using that information to provide users with sleep insights and health recommendations.
For Samsung, the Galaxy Ring isn't designed to be a standalone device, even though you don't need a Samsung phone to use it ... guidance on caffeine and light exposure Ultrahuman has.
The Oura Ring 4 comes in ring sizes 4 to 15, and it’s highly recommended you use a sizing kit (supplied ... is highly reflective and glints in the light, taking away some of the basic silver ...
The Oura Ring 4 is the best smart ring ... To deliver that data it’s using similar sensors used in wrist-based devices, so light-based optical sensors that deliver continuous heart rate ...