Music Theory Companion

Contains adsIn-app purchases
4.6
2.19K reviews
100K+
Downloads
Content rating
Everyone
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About this app

Music theory is very important while composing any song. This music theory helper app is for all the musicians who are interested in studying scales, chords, alternative chords, circle of fifths, voice leading, modulations or key change etc. and apply them in their compositions. Music Theory Companion is a quick reference for scales and chords useful for the musicians and composers for finding out new innovative chord progressions while songwriting. This is also a guitar chords app which is very useful for learning guitar chords.

Please, contact us if you find any problems with the app, or you want to suggest any new features or simply want to give us some feedback!



TOOLS AND FEATURE HIGHLIGHTS

āœ… Scales & Chords → 86 unique heptatonic scales/modes and their diatonic triads/seventh-chords formation
āœ… Matching Chords → Shows alternate chords that can be played for any note of any scale
āœ… Matching Scales → Shows all possible alternative scales those can be played with any scale
āœ… Circle of Fifths (or Circle of Fourths) → For all the scales
āœ… Cube Dance → Guide to voice leading based on the Neo-Riemannian theory
āœ… Intervals → Ear training of intervals for all keys
āœ… Chord Library → Chord library with 1000+ chords and also shows chord construction
āœ… Modulations → Different chord progression options to smooth key change
āœ… Scale Practice → Pitch detector to practice all the scales with guitar, piano or vocal
āœ… Metronome → With perfect timing and different configurable sounds
āœ… Piano → A very realistic piano keyboard with different instrument sounds
āœ… Symbols → Quick online handy reference for musical symbols
āœ… Reference → Huge collection of online music theory reference
āœ… Left-handed & right-handed realistic guitar fretboard
āœ… Supports both sharp (#) and flat (b) notes for root
āœ… Supports Clockwise and anticlockwise directions for circle of fifths
āœ… Option to show both triads and 7th chords in circle of fifths
āœ… Play guitar chords or piano chords in sync with the metronome ticks



APP USAGE

This app can be used for following purposes:

āœ… Music Composing → This app can be used by the music composers. It can help finding out basic and advanced chords that can be applied on any scale or mode.
āœ… Music Theory study → This music theory app can be used to study scales and chords for almost all available heptatonic scales and modes. This app contains many music theories articles and it can be used as a music theory free book.
āœ… Circle of Fifths → The Circle of fifths for all the scales and modes with triad and seventh chords. This is the most used musical tool.
āœ… Chord Finder → All possible chords for all the available scales and modes can be found.
āœ… Chord Progressions → Using the Circle of Fifths tool, chord progressions can be derived for the available scales and modes.
āœ… Modulation or Key Change → Different options for key change can be found using the Modulations tool.
āœ… Voice Leading → Using the Cube Dance tool, different voice leading options can be tried.
āœ… Guitar Chords / Piano Chords → All available chords are shown in guitar fretboard and piano keyboard.
āœ… A Vocal Training app for vocal training for singers using the Scale Practice tool.
āœ… Ear training for the musicians using the Intervals tool. Ear tuning is as important as learning scales or chords.
āœ… Scales and Chords → Wide list of scales for guitar, piano and vocal are available in this app.
āœ… Metronome beats for guitar, Drum set, Piano, vocal practices. The metronome in this app is very accurate in maintaining timing.


This is a piano chords learning app and piano chord finder to help you learn scales, learn music theory and guitar chords. It has a metronome tool too that eliminates need for any other metronome app for your practice.


COMMUNITY

Please join: https://www.facebook.com/Music-Companion-2212565292395586/
Updated on
Apr 30, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Device or other IDs
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.6
2.09K reviews
Chris Nusbaum
March 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 voicings, w/ ability to hear & see them visually represented on staff/piano/fretboard. I'll add a plus to my 5* for that šŸ˜„.
8 people found this review helpful
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PG App Studio
March 16, 2025
Thank you for your amazing 5-star review! Chord inversions and different voicings with visual/audio representation is in our future roadmap. If you have more ideas, please reach out at pgappstudio@gmail.com. Enjoy making music! Please recommend the app to your musician friends. Thanks.
Seth Baker
November 26, 2024
Five stars, great app, I use it all the time in my songwriting. I was on the free version till today because I only buy apps with a one-time price -- I don't do recurring payments. So, thanks for adding that option. Only one minor issue: since buying the full version, the app randomly turns completely white with no usable screens. I force stopped it, cleared cache and data, reinstalled; it still does it. Just as randomly it starts working normally again, so I can live with it! ETA: Fixed itself
31 people found this review helpful
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PG App Studio
November 23, 2024
Thank you for your kind feedback. We will look into the issue. It would be of great help if you send us some screenshot or screen recording of the problem at pgappstudio@gmail.com so that we can understand the problem better. Thank you in advance.
Martin Norvaisa
June 9, 2024
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.
26 people found this review helpful
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PG App Studio
October 8, 2024
Dear User, thank you very much for sharing your valuable & useful feedback. If you have other feedback or suggestions, please write to us at pgappstudio@gmail.com. We would love to hear from you! Keep using the app and please recommend it to your musician friends.

What’s new

āœ” Piano - played keys are highlighted on piano scroll
āœ” Piano - key size increase/decrease buttons are now available in full screen
āœ” Piano - playing diatonic chords is improved
āœ” Piano settings are organized in a better way
āœ” Fixed few bugs