We’re not supporting FitBit at the moment. However you can sync all steps data and heart rate data back and forth between Sleep Cycle and Apple Health.
To be able to do this;
Go to Health > Source > Sleep Cycle > Allow Sleep Cycle to read data
Also, go to Sleep Cycle > Settings > Advanced > Apple Health > Connect.
We are constantly looking at different ways and solutions to develop and improve Sleep Cycle for our users. We are therefore very grateful for all the suggestions that we get.
This feature is yet not available for Android users.