QuadLevel is a level app for your iPhone that gives you four displays at once. It responds quickly but smoothly. Three of the displays tell you in cm/m (or inches per 10 feet) how far off you are from level or plumb. This way you can avoid doing trig! At 1 cm/m or 1″/10 feet, it’s the most accurate level available on the app store! Calibration is super easy, with an amusing sound to let you know when it’s done.
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