Music Theory Companion is a must-have app for all the musicians who want to enhance their music theory knowledge. This app is designed to help the users with scales, chords, alternative chords, circle of fifths, voice leading, modulations, and key change. With this app, one can find innovative chord progressions while songwriting. It has a vast library of scales and chords that are useful for the musicians and composers.

The app has some fantastic features like ear training, pitch detector, chord library, piano keyboard, guitar fretboard, and metronome. The metronome is very accurate in maintaining timing and eliminates the need for any other metronome app for your practice. The app also has a vocal training tool for singers using the Scale Practice tool. The Circle of Fifths tool is the most used musical tool that shows all the scales and modes with triad and seventh chords. The Cube Dance tool is a guide to voice leading based on the Neo-Riemannian theory.

Overall, Music Theory Companion is a comprehensive music theory app that can be used for music composing, music theory study, finding chords, chord progressions, key change, voice leading, and much more. The app is available for free on Android and is a perfect companion for all the musicians out there.