Music Theory Companion

Contains adsIn-app purchases
4.2
2.34K reviews
5L+
Downloads
Content rating
USK: All ages
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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
20 Oct 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

4.3
2.23K reviews
Aakash XD
24 October 2025
​Disappointed—Can't Hear Anything! ​I was really looking forward to using this, as the layout and features seem great. However, I can't actually use the core functions because there is no sound. The metronome is completely silent, which defeats the purpose of the app. Until this major audio bug is fixed, it's just a visual interface and not a functional tool.
Did you find this helpful?
PG App Studio
26 October 2025
We’re very sorry for the trouble you faced with Music Theory Companion. Audio issues are critical, and our Development and QA teams want to fix this. Please share your device details at pgappstudio@gmail.com so we can resolve it quickly. We’d love to improve the app and earn your 5★ rating.
John Pampliega
30 September 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. Edit: It works now!
9 people found this review helpful
Did you find this helpful?
PG App Studio
22 September 2025
We’re really sorry to hear about the trouble you faced and appreciate your honest feedback. It sounds like a bug or performance issue affecting sound. Please reach out to us at pgappstudio@gmail.com with details so our team can help fix it. We’d love to make Music Theory Companion fully enjoyable for you!
Gun Dark
24 October 2025
A very handy companion with some excellent features. The best ones that I use being the circle of fifths chart, complete with chords and the built in keyboard that also has chords, plus a recording function. Super app.
Did you find this helpful?
PG App Studio
24 October 2025
Thank you so much for your wonderful 5⭐ review! 🌟 We're thrilled you enjoy the Circle of Fifths, chord features, and recording tool in Music Theory Companion. Your support inspires our team to keep improving. Please recommend the app to your musician friends — they’ll love it too! 🎶

What's new

✓ Reduced advertisements
✓ Fixed few bugs