Smart rings can be more comfortable and unobtrusive to wear than the best fitness trackers, and when I tested the Oura Ring I was impressed by the higher level of accuracy it offered for sleep tracking when compared to sports watches.
I hoped that the Circular Smart Ring Slim might be similarly effective and become a rival to the Oura but, after a month of testing, the Circular Slim has failed to wow me, with the design and the accuracy of its tracking falling short.
