Kids Mode - Child lock is an Android™ app that allows parents to control the phone usage of their children. The features in this app can be used to limit your child's phone usage, including daily screen time, set screen time for your kid, control their smartphone usage, lock apps and websites.

The way this app works is that it will send a message to the child's device when they are using their device for certain activities. The parent can then lock the kid's device, or lock the app so they cannot use it to open the activity that triggered the notification.