What I’m looking for How we test smart rings Collapse Smart rings are meant to be a stylish and discreet alternative to traditional fitness trackers. And we compare them to a smartwatch, the Oura Ring, and a smart bed to gauge sleep and health tracking accuracy. Best smart ring for most peopleSurprising no one, it’s the Oura Ring 4. The upgrades from the Oura Ring Gen 3 to the Oura Ring 4 were mostly software-based, with minor hardware refinements. I’ve gotten around eight to nine days on a single charge — far better than any other smart ring I’ve tested.