Back Me Up is a personal reverse walk assistant. It warns other people when you are walking in reverse, so you don't have to!

Your phone's accelerometer is used by our revolutionnary AI based reverse walk detector (patent pending) in order to provide ground breaking functionnality.

It works with every activities that involve walking. In reverse... Do NOT try to use it with your car, bike, space shuttle, or while travelling by pony. It might explode (the application, not your pony).