LED Color Tester is an Android application developed by coolbeans that allows users to test LED notification light colors on their phone. This app is only compatible with phones that support colored LED notifications, such as Galaxy S3 S4 S5 S6 S7, Galaxy Note 4 5 6, Nexus 5 5X, Nexus 6 6P, LG G3 G4.

Users can select a color from a color wheel or color code and see that color in action. The app also includes a new feature called Disco Mode, where the LED color will change every second.

It is important to note that for the LED light to work, users must check that the "Pulse notification light" setting under their phone's "Display" settings is enabled. Additionally, users should remove this app from task killers. There have been reports that this app doesn't work when the app "Light Flow" is installed, so users should try temporarily uninstalling it if they experience any issues. It is also important to note that this app will not change LED colors for SMS or calls; users should try "Light Flow" for these features.

Overall, LED Color Tester is a useful app for those who want to test LED notification light colors on their Android phone.