Music Theory Companion icon

Music Theory Companion v8.0.4

Contains ads β€’ In-app purchases

Music Theory Companion screenshot 0 Music Theory Companion screenshot 1 Music Theory Companion screenshot 2 Music Theory Companion screenshot 3 Music Theory Companion screenshot 4 Music Theory Companion screenshot 5 Music Theory Companion screenshot 6 Music Theory Companion screenshot 7 Music Theory Companion screenshot 8 Music Theory Companion screenshot 9 Music Theory Companion screenshot 10 Music Theory Companion screenshot 11 Music Theory Companion screenshot 12 Music Theory Companion screenshot 13 Music Theory Companion screenshot 14 Music Theory Companion screenshot 15 Music Theory Companion screenshot 16 Music Theory Companion screenshot 17 Music Theory Companion screenshot 18 Music Theory Companion screenshot 19 Music Theory Companion screenshot 20 Music Theory Companion screenshot 21 Music Theory Companion screenshot 22 Music Theory Companion screenshot 23

About this app

Developer Description

Music theory, scales, chords, ear training & songwriting tool for all musicians

Unlock your musical potential with the Music Theory Companion app! This comprehensive tool is designed for musicians of all levels, from beginners to experienced composers. Whether you're into songwriting, music theory study, or want to improve your playing, this app is a goldmine. This app helps you develop your aural skills and relative pitch. It can help with improvisation, composition, arrangement, and interpretation.


🌟 KEY FEATURES:
βœ… Scales & Chords: Explore 86 unique heptatonic scales/modes and their diatonic triads/seventh-chord formations. The app has a wide list of scales for guitar, piano and vocal.
βœ… Matching Chords: Discover alternative chords for any note in any scale.
βœ… Matching Scales: Find alternative scales that can be played with any given scale.
βœ… Circle of Fifths: Visualize the circle of fifths for all 86 scales, with options for triads and seventh chords. The circle of fifths tool can be used for finding chord progressions. The app supports both clockwise and anticlockwise directions for the circle of fifths.
βœ… Voice Leading: Use the Cube Dance tool for voice leading guidance based on Neo-Riemannian theory.
βœ… Chord Library Access a library of 1000+ chords, with chord construction details. This can be used as a chord finder.
βœ… Modulations: Explore various chord progression options for smooth key changes.
βœ… Scale Practice: Use the pitch detector to practice scales on guitar, piano, or vocals. This app can also be used for vocal training and helps with ear tuning.
βœ… Intervals: Train your ear with interval exercises in all keys.
βœ… Metronome: Practice with a highly accurate metronome that has configurable sounds. The metronome can be used with guitar, drum set, piano, and vocal practices.
βœ… Piano: A realistic piano keyboard with different instrument sounds. This can be used as a piano chords learning app.
βœ… Guitar Fretboard: Realistic left-handed and right-handed guitar fretboard display. The app is also a guitar chords app.
βœ… Musical Symbols: Quick online reference for musical symbols.
βœ… Music Theory Reference: Access a vast collection of online music theory resources, making it a great free music theory book.
βœ… Supports both sharp (#) and flat (b) notes for root.
βœ… Play guitar chords or piano chords in sync with the metronome ticks.
βœ… Has a simple and easy-to-use user interface.
βœ… Provides analytical labels such as Secondary Dominant and Secondary Leading-Tone.
βœ… Shows compatible scales' chords.
βœ… Displays similar and relative scales.
βœ… Shows common degrees: Tonic, Supertonic, Mediant, Subdominant, Dominant, Submediant, Leading tone (in Major scale) / Subtonic (in Natural Minor Scale)
βœ… Displays compatible chords' scales.
βœ… Shows chords and scales on the staff with treble and bass clef.


🎯 APP USAGE:
This app is a complete toolbox for musicians and can be used for:
βœ… Music Composing
βœ… Music Theory Study
βœ… Chord Progressions
βœ… Modulation and Key Change
βœ… Voice Leading
βœ… Guitar and Piano Chord Practice
βœ… Vocal Training
βœ… Ear Training
βœ… Sight reading

🎼 Designed for:
🎹 Pianists & keyboard players
🎢 Musicians, composers, and songwriters
🧠 Music theory learners & teachers
πŸŽ“ Students preparing for music exams
🎧 Anyone who loves creating music

The Music Theory Companion app has a realistic piano keyboard and guitar fretboard. It also has a pitch detector.
This app is continuously updated and improved.


COMMUNITY

Follow us on Facebook
https://www.facebook.com/MusicCompanionApp/

Join Our Facebook Group
https://www.facebook.com/groups/MusicCompanionGroup/

Visit Our Website
https://www.pgappstudio.com

Check our YouTube Channel
https://www.youtube.com/@PGAppStudio

Contact Customer Support
pgappstudio@gmail.com

What's New

βœ“ Enhanced UI
βœ“ Fixed Scale Practice tool
βœ“ Fixed few bugs

In-app purchases

$0.49 - $33.99 per item

Version Information

Version
8.0.4
Downloads
500K+
Updated on
Dec 4, 2025
Released
May 23, 2018
Requires
Android 7.0

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Music Theory Companion - Google Play Rankings

No ranking data available yet. Rankings are updated daily.

#148 in Top Grossing Music And Audio in Netherlands

Music Theory Companion users say on Google Play

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Martin Norvaisa Martin Norvaisa

Useful app for reinforcement of music theory, quick references (with the means to try out the concepts) and expand your knowledge. You need to have some theory background, as it's not a teaching course in and of itself. Though you can learn more with it to enhance your knowledge of theory, as well as fill in some blanks. It covers a wide range of "tools" that may be a single app from other sources. It's like a complete toolbox. Kudos to the developer of this app.

57 Jun 9, 2024
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John Pampliega John Pampliega

Hello. I'm not too sure if I'm using the app correctly, but it seems that I can't hear any sounds play at all. The only time I hear something is when I go through the playback of the grand piano feature. Because of it, the entire app experience, for me, was lost. This might be a bug or a performance issue. I want to give this app a second chance, because it does look pretty promising to use. Edit: It works now!

25 Sep 30, 2025
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Kieran Drain Kieran Drain

Great app however recently that advertisements are getting too invasive and opting out of the mountains of advert tracking in the privacy options just takes far too long so I've uninstalled. To be clear, I can live with adverts. It's the inability to opt out of tracking easily which is the problem.

9 Nov 23, 2024
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Aakash XD Aakash XD

​Disappointedβ€”Can't Hear Anything! ​I was really looking forward to using this, as the layout and features seem great. However, I can't actually use the core functions because there is no sound. The metronome is completely silent, which defeats the purpose of the app. Until this major audio bug is fixed, it's just a visual interface and not a functional tool.

4 Oct 24, 2025
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Jim M Jim M

Not sure how this app has such a high rating. The first two tools I tried, it went straight to intrusive full screen video ads I had to sit through for 30 seconds. That makes it completely unusable and a waste of time for me.

23 Aug 18, 2025

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