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Circle o Fifths: Music Theory

Circle o Fifths: Music Theory

Chord progressions and theory

1K ratings
53 reviews
📚 Education
🎵 Music
$2.99

Details

  • Released
  • Updated
  • February 19, 2020
  • July 27, 2026

Features

Developer

Tim Mueller
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About

Learn and practice music theory with an interactive circle of fifths. Explore major, minor, and diminished keys with audio recordings and guitar chord charts. Visualize chord relationships and transpose songs easily.

✓Interactive circle of fifths
✓Major, minor, and diminished keys
✓Audio recordings of chords
✓Guitar chord charts
✓Color-coded note/chord reference
✓Chords tab for key relationships
Show original description

What users say

Summarized from real user reviews of Circle o Fifths. Based on 1K reviews and a 4.8/5 average, it highlights the 4 positives and 4 negatives reviewers mention most about this Music app.

Positive things

  • 👍Simple and user-friendly
  • 🚀Helpful introduction to music theory
  • 💡Great tool to learn the circle of fifths
  • 🎨Useful for songwriting and chord progressions

Negative things

  • 🐛Sizing/formatting issues on smaller screens
  • 🐛Touch responsiveness issues
  • 🐛Incorrect chord samples (B major sounding like Emajor)
  • 🔇Sound issues (app asking to turn up volume)
See all reviews

What's New in Circle o Fifths

2.1.1

July 27, 2026

Polishing a few things.

Events

Read more about Build chord progressions
Event EndedMajor Update

Build chord progressions

Loop chord progressions on piano or guitar

Jun 24, 2026 — Jul 21, 2026

Read More

Read more about Piano mode
Event EndedMajor Update

Piano mode

Piano mode

Jun 23, 2026 — Jul 15, 2026

Read More

See All

User reviews

Most RecentHighest RatedLowest Rated

可以增加中文支持吗

可以增加中文支持吗，谢谢！
caoqing345caoqing345

Simply a Great tool!

This app keeps getting better. Great Job!
GSP 2026GSP 2026

Response from developer

Thanks so much for the review! Glad to hear you like the app!

Works great, nice reference and tool!

Like another review, there was no sound initially, but it started working after I tapped something or it need a little time connect the audio driver, but it started working. My request is to add PARTS (A,B,C,etc.) to the Progressions tab, with loop counters, so we can construct whole songs. Then it would be incredible as a songwriting tool and composition theory machine. General MIDI support would also be nice. The ability to select external MIDI devices for rhythm and tones would also be useful! I’m saving a star for those features. That all said, the price~performance ratio is superb. Buy it!
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TekrytorTekrytor

Response from developer

Thanks so much for the review! Great ideas! Watch out for more updates in the future!

piano version good update

I’m enjoying playing about with this!
gw3mgw3m

Response from developer

Hi gw3m, Just wanted to reach out to let you know that piano mode has been added! Tim

Useful

Great tool and helpful
Hemming NHemming N

Response from developer

Hi Hemming N, So glad to hear you like the app and it's helpful, thanks for the review! Tim

See 48 more reviews

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User experience

🐞

Reported Bugs

3 issues

Viewport not dynamic, causing cut-off edges

Bug

No E# in the key of F#, should be F dim

Bug

B major chord sample sounding like Esus

Bug
✨

Requested Features

3 requests

Add more chord variations and voicings

Feature

Provide options for different instruments (e.g., ukulele)

Feature

Include major and minor pentatonic scales

Feature

FAQ

What is the Circle of Fifths: Music Theory app?

This app is a music theory tool designed to help users learn and practice the circle of fifths. It provides interactive elements, audio recordings, and guitar chord charts to understand key relationships and chord progressions.

What are the key features of this music theory app?

Key features include an interactive circle of fifths with three rings for major, minor, and diminished keys, 36 audio recordings of chords, guitar chord charts, color-coding for easy reference, and a dedicated chords tab for exploring key relationships.

Is the Circle of Fifths: Music Theory app free to use?

Yes, the application is available for free. There are no in-app purchases or advertisements mentioned in the provided description, suggesting a completely free experience.

Who would benefit from using this music theory app?

This app is ideal for musicians, songwriters, and music students who want to improve their understanding of music theory. It's particularly useful for learning chord relationships, practicing in different keys, and aiding in song composition.

How does the app help with learning guitar chords?

The app includes 36 guitar chord charts that can be accessed by tapping and holding on any note or chord within the circle of fifths. This allows users to see how to play each chord and learn its position on the guitar.