App to replace physical buttons

There's a free app that replaces the functions of the physical buttons of the android system (back, apps open, home), I have an old Android phone that due to heavy use the buttons were somewhat unresponsive, and without them it was almost impossible to use. If you need it its name is Backbutton, and here's the link (it's free and it doesn't need root access)

https://play.google.com/store/apps/detai...us.backkey