(Android 4.1 or above)
Distribute an app that I made to myself. Wanted to sync every now and then to save battery. App runs in the background. Starts auto sync between 12:00 and 12:05 each day and then turn it off. You can not change the settings in any way.
How to use it:
When you launch the app there is no screen but you can see the app running in the background if you go to settings> apps> running.