App for PC/Android devices to measure simultaneity in scales, arpeggios, Hanon, and similar exercises. It measures the simultaneity of your fingers in milliseconds by detecting desynchronizations, displaying results in charts, and storing a recording history to improve your piano technique, with the option to choose from 5 study levels: elemental (110 ms), basic (80 ms), intermediate (50 ms), advanced (30 ms), and professional (15 ms).