Level Tool is a free leveling app that lets you measure the angle of any surface, including walls, floors, and ceilings. Just take a picture of the surface you're measuring and use the onscreen lasers to calibrate it. The app has several options that allow you to choose from, including the 3 in 1 bubble level, the clinometer, and the compass.

This app is a handy tool for you to have on your smartphone or tablet. It is useful for construction, where you need to know the angle of the walls and floors. It is a great tool for professionals and for people who need to measure the angle of any surface.