Music theory, scales, chords, ear training & songwriting tool for all musicians
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. It is ranked #191 in music & audio.
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.
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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.
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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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