A free program for Android, by PurePush AR.

The app is a perfect light source for parties. Simply select your favorite color and start the flashing LED light. No additional setup is needed. Just turn on your phone or tablet, start the application and the party is ready to begin. You can use it in any room or outdoor space. It is very easy to use and the best part is that it is so simple and so fast.

To use it, you just have to open the application, select the color you want and start the party. You can also select a different color for each contact. So, if you have a lot of friends, you can set a different color for each of them.