Wind Down (root, beta)

放鬆下來的是Android P的偉大的新功能這個應用程序提供給大家

Wind Down is a great new feature of Android P. It allows to switch the screen to grayscale at a certain time to prevent you from spending the whole night at your phone. This app ports the feature to older Android versions.

This app is still in beta. The app requires root access.