The best smart rings of 2025: Expert tested and reviewed

At this point in the smart ring race, everyone is trying to beat Oura. But the Oura Ring 4 proves that the smart ring pioneer's position isn't wavering anytime soon. While most smart rings simply provide you with the health data it collects, the Oura Ring 4 tells you the story and the context behind that data for greater information on your health. Oura recently revealed the Oura Ring 4, the successor to its popular Oura Ring 3 which debuted in 2021. The new generation comes with smart sensing technology for a more accurate, thinner, less obtrusive, and longer wear with fewer gaps in data capture. Oura upgraded the number of signal pathways (basically how the sensors monitor and collect data inside the ring) from eight in Ring 3 to 18 in Ring 4. It also flattened the inside of the Ring 4 for more comfortable wear (if you have worn the Ring 3, you know how irritating the domed sensors could get around your finger after prolonged wear). Lastly, the smart sensing allows for one extra day ... Read full article.