Useless Button is a free Android app developed by Riccardo Camattari. It is a simple app that offers only one feature: a button that does nothing. When you click the button, it produces a clicking sound and a counter shows how many times you have clicked it. If you click it fast enough, the counter turns red and your phone vibrates.

The app also offers different background options, including total white, total black, metal sheet, circuit, and electronic. Additionally, you can choose to use a background from your phone's gallery.

Useless Button is an app that serves no real purpose, but it can be a fun and entertaining way to pass the time. It is easy to use and has a simple interface.