Music Theory Companion

8.2.3

PG App Studio

4.42

2,399 reviews

500,000+
Downloads

Free

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

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4.42 · 2,399 reviews · 500,000+ downloads

Music Theory Companion is a comprehensive all-in-one toolbox for musicians, merging scales, chords, ear training, and songwriting into a single app. It pairs theory with practical practice tools like a realistic piano keyboard, guitar fretboard, metronome, and voice-leading guidance to support musicians from beginners to seasoned composers.

Pros & Cons

Comprehensive, all-in-one toolbox for theory and practice (scales, chords, intervals, voice leading, modulation)
Large chord library of 1000+ chords with construction details and a finder tool
Cross-instrument support (piano, guitar, voice) with realistic keyboard and fretboard visuals
Practical practice tools (metronome, pitch detector, staff view, online theory resources) and ongoing updates

Some resources are online-only (Music Theory Reference) rather than offline
No explicit MIDI export or built-in song library indicated in the data
Not ranked in any top app lists, which may affect visibility compared to competitors

About Music Theory Companion

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

Download Statistics

Music Theory Companion has been downloaded 670 thousand times. In the last 30 days, the app was downloaded 12 thousand times.

User Ratings

Music Theory Companion is rated 4.42 out of 5 stars. The rating is based on 2.4 thousand ratings.

App Information

Music Theory Companion is FREE to download. The APK download size is 14.41 MB. The latest version available is 8.2.3. The last update was on June 30, 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 July 2018.

Description

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.

More data about Music Theory Companion

Price	Free to download
Total downloads	670 thousand
Recent downloads	12 thousand
Rating	4.42 based on 2.4 thousand ratings
Ranking	Not ranked
Version	8.2.3
APK size	14.4 MB
Number of libraries	20
Designed for Android	7.0+
Suitable for	Everyone
Ads	Contains ads

App Performance Report

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Alternative downloads for the Music Theory Companion app

Music Theory Companion compared with similar apps

Common keywords of similar apps

Leading Tool Vocal Metronome Https Companion Voice Realistic Keyboard Shows Improved Songwriting Designed Composers Study Helps Explore Triads Seventh Matching Alternative Options Supports Library Access Detector Sounds Handed Music Chords App Scales Theory Piano Chord Guitar Scale Ear Training Musicians Pitch Circle Fifths Practice Musical Key Fretboard Relative Progressions Interval

Keywords missing from this app

Notes Major Minor Reading Mode Rhythm Modes Tools Learn Play Learning Songs Create Lessons Exercises Skills Harmonic Bass Progression Free Note Harmony Intervals Recent Features Inversions Song Custom

Google Play Rating history and histogram

1.9K

140

120

210

Downloads over time

Music Theory Companion has been downloaded 670 thousand times. Over the past 30 days, it averaged 410 downloads per day.

Changelog of Music Theory Companion

Show changelog

Developer information for PG App Studio

PG App Studio

pgappstudio@gmail.com

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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 😄.

★★☆☆☆ 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.

★☆☆☆☆ 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.

★☆☆☆☆ 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.

★☆☆☆☆ 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.

Google Play Rankings for Music Theory Companion

This app is not ranked

Technologies used by Music Theory Companion

Music Theory Companion is requesting 15 permissions and is using 20 libraries.

Permissions

Network communication

view network connections, full network access, Google Play billing service, receive data from Internet

Hardware controls

change your audio settings, record audio

System tools

prevent phone from sleeping

Extra

android.permission.ACCESS_ADSERVICES_AD_ID, android.permission.ACCESS_ADSERVICES_ATTRIBUTION, android.permission.ACCESS_ADSERVICES_TOPICS, android.permission.FOREGROUND_SERVICE, android.permission.POST_NOTIFICATIONS, app.pg.scalechordprogression.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION, com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE, com.google.android.gms.permission.AD_ID

Ad network libraries

AdMob

Social libraries

None found

Development tools

Android Jetpack core

Android Architecture Components

Android Jetpack VersionedParcelable Android Jetpack Annotations Android Library Icon

Android Jetpack Annotations Firebase Android Library Icon

Firebase

Android Jetpack Widgets Android Jetpack AppCompat Android Library Icon

Android Jetpack AppCompat AndroidX Activity Android Library Icon

AndroidX Activity Android Activity Saved State Android Library Icon

Android Activity Saved State Google Cloud Messaging (GCM) Android Library Icon

Google Cloud Messaging (GCM) AndroidX App Startup Android Library Icon

AndroidX App Startup Android WorkManager Android Library Icon

Android WorkManager AndroidX Emoji / Emoji2 Android Library Icon

AndroidX Emoji / Emoji2 AndroidX ProfileInstaller Android Library Icon

AndroidX ProfileInstaller Chromium Android Library Icon

Chromium

AndroidX WebKit AndroidX Preference Android Library Icon

AndroidX Preference Jetpack DataStore Android Library Icon

Jetpack DataStore Lottie Android Library Icon

Lottie

Trust & Safety: The app requests microphone access (RECORD_AUDIO) for pitch detection, along with Internet, network state, foreground service, notifications, and Google/Ad ID related permissions. In-app billing is present, and there are dynamic/broadcast-related permissions noted. This combination aligns with its features (pitch detection, online resources, ads, and background tasks). The FOREGROUND_SERVICE and advertising-related permissions suggest background operation and monetization, while the RECORD_AUDIO permission is necessary for its core ear-training capabilities. Overall, permissions appear typical for an audio-focused learning app, with standard safety considerations for advertising and user data use.

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