Oura is giving its popular smart ring and app a substantial makeover. The company just announced the $349 Oura Ring 4, which will feature a slimmer design, improved accuracy, and more sizes. Starting today, the Oura app will also be getting a complete redesign to better organize the swath of new features introduced over the past few months.

Oura today announced its latest smart ring, the all-titanium Oura Ring 4, featuring improved accuracy and a redesigned companion app. The

The smart tracker brand introduced its slimmest design to date with the Oura Ring 4, featuring smaller sensors, improved accuracy and more sizes, starting at $329.