Which wearable step counters does Vivace support?

Vivace will work with any step counter that supports Apple HealthKit. The Motiv8 team has tested Vivace with Apple Watch, Withings, and Jawbone; there are many other devices that work with HealthKit that should work with Vivace. Unfortunately, since Fitbit does not support Apple HealthKit, Vivace isn’t able to read your activity from Fitbit.