<i>Diatronome</i> is a 3-in-1 android application. It provides a <b>tuner</b>, a <b>visual-metronome</b>, and a <b>synthesizer</b>. <b><u>Features</u></b>: - Adjustable references pitch - Transposition support - Visual indicator for tuner and metronome - Continuous synthesizer mode - Capture tempo (central click on metronome) - Multiple customizable settings (including app color) - Advanced parameters available to work on a wide range of devices. Audio recording and playback permissions are required to run. The application provides an useful practice tools for musicians. Keywords: metronome, tuner, synthesizer