A very buggy app, that has a totally deaf ear. Here are just few examples:1. The app doesn’t recognize the sound of more than two notes played at a time. When playing a chord and a note, the app doesn’t recognize the sound, and claims it was played incorrectly, so you have to play the chord notes one by one, and not as it was written on the stave.2. Doesn’t recognize the sound. For example, in some melodies, according to the app response, it doesn’t matter what note was played, for instance, you play a C1 note instead of A4, and the app claims that it was correct, but when you play the correct note once instead of twice, it claims that the note was played 3 or 4 times in a row.3. The app claims that the environmental noise is a correctly played song. For instance, your dog is barking in the garden, or you are talking to a family member during play and the app claims that I played a future note was already played correctly (it enters the screen while already green).4. Incorrect speed of playing. The app reacts only to touching the note, but doesn’t care about its length. So, playing a whole note, which is shown on the screen at the speed of at least a sixty-fourth note is definitely incorrect. More than that, the speed of the moving lines doesn’t change according to the note, and is so fast, that you have to play, for example, the first movement of Beethoven’s Moonlight Sonata at the speed of Grieg’s Hall of the Mountain King, which definitely isn’t right.