A free program for Android, by Make App Easy.

Are you one of those people who have a hard time falling asleep because your phone is always on? Are you one of those people who have to turn the brightness up to the minimum every night?

Dark Mode for Apps, Phone UI & Night Mode is an amazing tool that helps you to quickly and easily change the theme of your phone and your apps to a dark one. This tool is very easy to use and will help you save a lot of energy and also protect your eyes from the harmful effects of the screen.

This app is free to use.