Music Theory Companion

Contains adsIn-app purchases
4.6
2.22K reviews
100K+
Downloads
Content rating
Everyone
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About this app

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
Updated on
26 May 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
2.11K reviews
Chris Nusbaum
2 March 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 😄.
13 people found this review helpful
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PG App Studio
16 March 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
26 November 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
32 people found this review helpful
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PG App Studio
23 November 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
9 June 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.
27 people found this review helpful
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PG App Studio
8 October 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

✔ Piano - added metronome
✔ Piano - added recording and playback
✔ Metronome - Improved user interface
✔ Fixed few bugs