While there are many fitness trackers available these days, the Whoop 4.0 and the Oura Ring 3 are doubling down on their health and wellness tracking technology to provide even more accurate and robust data than many of their competitors.

These activity wearables are primarily designed to track daily health, fitness, and sleep data. They use a variety of sensors to measure heart rate metrics, skin temperature, and blood oxygen levels. The devices are also equipped with an accelerometer to track movement and calculate the wearer’s daily caloric burn.