I have tried a similar type app on an android phone. For me, it was not as convenient or user friendly as a Digital Angle device made for this application. A couple issues I had were holding my expensive smart phone against a scratching abrasive surface that will mar the finish. The phone is not magnetic, like the angle cube, so it must be held in place which makes it a little more difficult to use and the shape was not as ergonomic as the cube. Lastly, I couldn’t get the precision, accuracy and repeatability with the phone app that I did with the angle cube.
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