Natural Cycles launches wristband to replace thermometers for its FDA-cleared birth control app

The company behind the controversial app launched a wristband that tracks your temperature, heart rate, and movement while you sleep.

Oura Ring 4 review: This smart ring is a great sleep tracker, but not a great activity tracker

But as with previous generations, the Oura ring is chunkier than almost any ring you’re likely to wear as jewelry, which is ...