We created an App that helps strike a balance between screen time and physical activities. It's called healthy limit, currently available on the Google Play Store: https://play.google.com/store/apps/details?id=com.healthylim...

The idea is to use a Fitbit to track a kids steps and sleep, and reward them with screen time for every step and every minute of sleep.

Parents decide the rules of exchange for steps and sleep to screen time.