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Android Apps > Music & Audio > Music Theory Companion
Music Theory Companion icon

Music Theory Companion

by PG App Studio · Music & Audio · Free
On Google Play since July 2018 · Data updated 2026-11-01

Music Theory Companion is made and published by PG App Studio. AppBrain is an independent app data site and isn't affiliated with PG App Studio. The app name, icon, screenshots and description belong to PG App Studio and are shown as published on Google Play.

AppBrain's verdict

EstablishedWell rated
Total installs
710 thousand
Rating on Google Play
4.43
2,457 ratings
Last updated
September 29, 2026

Music Theory Companion has 710 thousand installs. Users rate it well: 4.4 stars from 2,457 ratings.

Official page on Google Play

Installs

Tracked by AppBrain
Last 30 days
15 thousand
Per day
500
30-day average
Play install range
500+ thousand
Launched
July 2018

Installs over time

Music Theory Companion has been installed 710 thousand times. Over the past 30 days, it averaged 500 installs per day.

Rankings

Google Play top charts

Google Play Rankings for Music Theory Companion

This app is not ranked

Competitors

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Releases

Updates seen on Google Play
Version
9.0.3
Launched
July 2018
  • Sep 29, 2026UpdateVersion 9.0.3
  • Aug 16, 2026UpdateVersion 9.0.2
  • Jul 23, 2026UpdateVersion 9.0.1
  • Jun 30, 2026UpdateVersion 8.2.3
  • May 6, 2026UpdateVersion 8.2.2
Show all changes Show fewer

User feedback

Ratings and reviews on Google Play

Google Play Rating history and histogram

1.9K
120
120
47
210

Comments on Music Theory Companion for Android

★★★★★ Autumn LeBeau · Feb 7, 2026
Love this app!! Helped me learn how to sight-read along with learning songs!! There are a few ads, but they are not as annoying as people make them out to be. The best thing about this is that it's free and available on Android unlike Pocket Pitch or other helpful music tools. It can also be a bit complicated for guitar chords, as it shows every possible finger placement for that chord, but I mostly use it for piano and choral pieces anyway.
★★★★★ Eric Hartman · Nov 27, 2025
Worth so much more than any other music app I've ever used. I basically learned Theory entirely from this app.
★★★★★ Chris Nusbaum · Mar 2, 2025
Great app! It's so useful to have a collection of tools like this in one place. I really like the ability to flip between viewing notes/chords on a staff, piano, and guitar fretboard. And as a lefty, being able to flip the guitar fretboard around is super helpful. One thing that would make it even better is to somehow integrate chord inversions and different chord voicing, w/ ability to hear & see them visually represented on staff/piano/fretboard. I'll add a plus to my 5* for that 😄.
★☆☆☆☆ Cloudy · Oct 23, 2026
I didn't have the same issue if instant ads, but I'm struggling to understand the value in this app, and what you're actually paying £27.99 for on a lifetime package. The way scales are arranged is not intuitive, chords are a complete and utter mess and the sound is awful. To call it a theory companion is a bit of a stretch too. The theory section is actually embedded Wikipedia pages! £28 for ineligible scales, messy chords, and Wikipedia. I think these are fake 5-star reviews.
★☆☆☆☆ Vince Paul · Apr 16, 2025
I don't get it. Tried the "modulation" but it doesn't have progressions, it just repeats the last chord you selected. No target chord, no way to select "a progression"... on second thought I'm lowering my rating. I don't know why I gave it so many stars in the first place.
★☆☆☆☆ Mark Automaton · Jun 10, 2025
Used to use this all the time, but now the intrusive full screen ads have taken over, making it unusable. Uninstalled.
★☆☆☆☆ Robin Svoboda · Sep 26, 2025
It might be good but the aggressive coomer ads they have just makes this hot garbage and nothing else. I installed it and wanted to check how much the premium version was and the moment I opened the settings I was met by one enforced coomer ad, not to mention the banner one which is there always and acceptable. They also sell your data even if you buy premium so this just hot and marinated garbage on fire.
★★☆☆☆ John Pampliega · Sep 6, 2025
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.

Technology

Found in the app by AppBrain
Ads
Contains ads
Price
Free
Libraries
19
App size
14.2 MB
Needs Android
7.0+
Content rating
Everyone

Technologies used by Music Theory Companion

16 permissions · 19 libraries
Subscribe to see full permission and library details

About the app and developer

About Music Theory Companion

Music Theory Companion is a music & audio app developed by PG App Studio.

Install Statistics

Music Theory Companion has been installed 710 thousand times. In the last 30 days, the app was installed 15 thousand times.

User Ratings

Music Theory Companion is rated 4.43 out of 5 stars. The rating is based on 2.5 thousand ratings.

App Information

Music Theory Companion is freely available from Google Play. The app size is 14.20 MB. The latest version available is 9.0.3. The last update was on September 29, 2026.

Technical Requirements

Music Theory Companion requires Android 7.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play since July 2018.

App Performance Report

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Developer information for PG App Studio

PG App Studio

pgappstudio@gmail.com

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Store listing

By PG App Studio, from Google Play

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

Music Theory Companion Screenshot 1 of 9
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Music Theory Companion Screenshot 9 of 9
Screenshots by PG App Studio, from the Google Play listing
Description by PG App Studio Written by the developer, not by AppBrain. Click to read.
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:
✅ 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.
✅ Matching Chords: Discover alternative chords for any note in any scale.
✅ Matching Scales: Find alternative scales that can be played with any given scale.
✅ 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.
✅ Voice Leading: Use the Cube Dance tool for voice leading guidance based on Neo-Riemannian theory.
✅ Chord Library Access a library of 1000+ chords, with chord construction details. This can be used as a chord finder.
✅ Modulations: Explore various chord progression options for smooth key changes.
✅ 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.
✅ Intervals: Train your ear with interval exercises in all keys.
✅ Metronome: Practice with a highly accurate metronome that has configurable sounds. The metronome can be used with guitar, drum set, piano, and vocal practices.
✅ Piano: A realistic piano keyboard with different instrument sounds. This can be used as a piano chords learning app.
✅ Guitar Fretboard: Realistic left-handed and right-handed guitar fretboard display. The app is also a guitar chords app.
✅ Musical Symbols: Quick online reference for musical symbols.
✅ Music Theory Reference: Access a vast collection of online music theory resources, making it a great free music theory book.
✅ Supports both sharp (#) and flat (b) notes for root.
✅ Play guitar chords or piano chords in sync with the metronome ticks.
✅ Has a simple and easy-to-use user interface.
✅ Provides analytical labels such as Secondary Dominant and Secondary Leading-Tone.
✅ Shows compatible scales' chords.
✅ Displays similar and relative scales.
✅ Shows common degrees: Tonic, Supertonic, Mediant, Subdominant, Dominant, Submediant, Leading tone (in Major scale) / Subtonic (in Natural Minor Scale)
✅ Displays compatible chords' scales.
✅ 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:
✅ Music Composing
✅ Music Theory Study
✅ Chord Progressions
✅ Modulation and Key Change
✅ Voice Leading
✅ Guitar and Piano Chord Practice
✅ Vocal Training
✅ Ear Training
✅ Sight reading

🎼 Designed for:
🎹 Pianists & keyboard players
🎶 Musicians, composers, and songwriters
🧠 Music theory learners & teachers
🎓 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

Recent changes:
✓ Improved piano key layout for a more realistic playing experience
✓ Added an option to hide banner ads
✓ Improved user interface
✓ Fixed several bugs
Official page on Google Play
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