Update 1.1: The phone will now give a slight vibration when either the vertical or horizontal level is at 0 degrees, so you don't need to look at the screen.

Update 1.2: Added a small link to my other apps.

There are tons of other spirit levels, but they are either rubbish, or not free. This is a simple spirit/bubble level that's free, doesn't have ad's, and looks really good.

The bubbles float around and squish against the sides.

There is also a graph mode which visually shows the change in angles over time - which isn't really for much except a bit of fun. Try taking it in the car and watching as the driver accelerates and breaks.

Mention in the review if you would like features added and I will be sure to add them :)