Gappp

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Gappp is an iOS app for iPhone and iPad that lets you measure the size of objects on flat or vertical surfaces. You can measure objects on ceilings that are normally out of reach or even on buildings in the distance without having to visit them in person. Using Gappp is simple. Switch to the Camera screen and wait for the colored square to turn green. Then, use the slider at the bottom of the screen to adjust the square to match the size of the object you want to measure.

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