Take a read through our Oura Ring 4 review and you'll see there's a lot to like about the smart ring that launched in October 2024: we described it as being "nearly the perfect fitness tracker", while praising its battery life, tracking capabilities, and design.
However, the high score attached to that review — 4.5 stars out of 5 — doesn't mean that the Oura Ring 4 can't be improved upon, and we've got some ideas about the kind of updates that might make the rumored fifth generation model a worthwhile upgrade.