The 1st Level app that doesn't need a level to level itself! Because it uses the gyroscope, it doesn't need to be calibrated against a certified surface like some of the older apps using only the accelerometer.
A Gyroscope Bubble Level! Runs on the iPhone or iTouch, using the internal Gyroscope for precise level measurements.
The best part! No manual calibration needed! It always automatically adjusts to gravity (Due to that cool Gyroscope in your device!) Also, because it uses the new iOS sensor fusion code, which uses not only the Gyroscope but other sensors, it needs no sensitivity adjustments like some of the older apps did! At over 200 times per second it aligns to gravity, making it incredibly accurate.
Has both a bubble view for quick reference, and a digital display (in degrees) for precise level measurements.