The best alternatives to Circadia are Gyroscope , Enough Sleep, and Sleep App. If these 3 options don't work for you, we've listed a few more alternatives below.
Gyroscope is a new operating system for the human body, designed to help humans manage their physical and mental health in our modern world. We believe in the power of data, coaching and preventative health. The app is designed to help people know everything about themselves, see how long they will live, and make better data-driven decisions every day.