Tonica - Harmonic training

Tonica is an app for harmony training designed for singers and instrumentalists. It offers intuitive controls that make practicing harmony quick and effective, featuring a 5-octave keyboard and flexible pitch options.

Key features include reference pitch selection from A=410–463 Hz, tunings in Equal temperament and Just intonation (major and minor), one-touch chord playback, sustain across notes, transposition, and a built-in metronome to keep you in time.