Take a square, well-lit, sharp photo with a modern smartphone, and this software is miraculous. I shot 7-8 sheets of guitar music, and it got 99% of the notes perfectly, so I bought the $10 pro version. Complainers: use the lite version to check whether your camera and processor is good enough. Not to give you valuable software for free. Software developers cost $$$ money. Photoscore and Smartscore are about $200. Playscore pro is only $10. That is an amazing bargain for very cool software.