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Circle o Fifths: Guitar+Piano

Circle o Fifths: Guitar+Piano

Chords, Scales & Songwriting

1.1K ratings
57 reviews
📚 Education
🎵 Music
$4.99

Details

Released
February 19, 2020
Updated
October 13, 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 about Circle o Fifths

Reviews of Circle o Fifths are mostly positive: the Music app is rated 4.8/5 from 1.1K App Store ratings. What users like most: simple and user-friendly, helpful introduction to music theory. Top complaints: sizing/formatting issues on smaller screens, touch responsiveness issues. Summarized from real user reviews.

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

2.2.6

October 13, 2026

Just some polish in this one.

Events

Read more about A scale a week
HappeningChallenge

A scale a week

Learn a new scale shape every week

Oct 13, 2026 — Nov 12, 2026

Read More

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

Super Helpful!

This app has been extremely helpful and insightful. Such good information. I have been able to use it so much when I need a quick chord progression. Highly recommend!!
##savlovesmusic

Response from developer

#savlovesmusic So glad you are finding it helpful! -Tim

Major good timez

Top tier update. I learn music so easy. 5 star! Lets to move chords around for future. Folk and Rock patterns! Loistava!!!
AaarthurVos

Response from developer

aarthurVos Love that you love the update, and are finding it easy to learn music! -Tim

Nice Updates But,,,,

In the progressions tab an Emaj chord as it sounds on the app is played as a G# chord in standard tuning on guitar and a Bmaj chord as it sounds on the app is played as a D# chord on guitar in standard tuning. Other chords may also be set to higher pitches.

However, The piano chords in the progressions tab are the right pitch to play along with on a guitar in standard tuning.

Overall I think you are developing the app in good ways. simplicity is genius as they say as well as efficient!
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G2GSP 2026

Response from developer

GSP 2026! Thank you for pointing that out! This has been fixed in version 2.2.1.

Excellent !

Rien à ajouter
DDrddupuy

可以增加中文支持吗

可以增加中文支持吗，谢谢！
Ccaoqing345
See 52 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.