Pocket Bubble Level - perfect app for every handyman DIY and smartphone holder. Accurate nice and easy to use at the same time very functional.
Install this app and you will have a spirit level always handy.

Our pocket bubble level uses the accelerometer and gyroscope (depending on smartphone model). It help to align or leveled when you try to hang any object horizontally vertically or set at any angle
Profesional bubble level app designed mostly for workers when they forget leveling toolwhen you need to see is some surface or wall straight or in the level with the ground.
-center ball near middle blue area
-put device to your surface.
When ball stops moving or moves very slow in the middle blue area your object is leveled