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.

I tried exercising in both the Oura Ring 4 and Whoop MG fitness band. Here is the one I preferred when it came to comfort, usability, and app design.

With an improved design and more features, the Oura Ring 4 has made its way onto my hand for good, but I'm not giving up my fitness tracker just yet

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