Oura has just announced that Apple's Ricky Bloomfield, MD, will join the company as its chief medical officer. The company ...

Circular's upcoming smart ring, the Circular Ring 2, could outdo Oura and Samsung with two ambitious health features.

Plus, the Oura app considers the data collected in your iPhone's Health app, too. The Oura Ring 4 requires a $6-per-month subscription, but the Apple Watch and Samsung Galaxy Ring do not.

Oura rings have exploded in popularity recently ... Enjoy advanced fitness and health features with Apple's latest watch model, designed with a larger display, thinner and lighter frame and faster ...