According to the complaint filed in U.S. District Court for the Northern District of California, Bal was an early investor in Oura, as well as serving as the company’s “primary marketing arm” in its early years as a cash-strapped start-up.

The Whoop band and its app feel more purposefully designed for fitness. While I definitely prefer the Oura Ring as a sleep tracker, the Whoop app and user experience is deeper and more versatile, casting a wide net for all types of athletes and performers.

A potential Oura Ring 5 may be a long way out, but I'm already hoping for these key features and improvements.

A travel writer and frequent flier discovered how to avoid jet lag, thanks to her Oura Ring, which is on sale for Amazon Prime Day. Find out how the wellness gadget acts as the ultimate jet lag self-care hack and get one for yourself at Amazon,