At last you’ve found the app! It's a must have app for anyone studying music.

The creative design and cutting edge intuitiveness of the circle of fifths diagram, is here to enhance your learning of music, without any of the guesswork.

This app will help you to memorize all major and minor keys fast, while understanding the key signatures and their relationships.

But it's not just about the circle of fifths alone, this app also has very many music theory fundamentals that every musician should master.

- New design and User Interface
- Full screen
- New slide menu (simply swipe left or right)
- Performance & stability: built with the latest tools and technology available

- All Key signatures in the Circle
The key signature will display when move (rotate) the arrow in the circle (2016 new update)

- The Guide (dots) - Version 2
You will discover regular patterns or algorithms.
Use the guide dots to understand the circle better and apply your own interpretations (e. g. simple math calculations). Simply rotate those small colored dots to see how they relate with other keys. This guide proves that all music can be transposed to any keys and you will see that the musical notes (intervals) remain equally spaced. (Hint: Double tap - return to original position)

- Change background
Try a different background whenever you want. Feel fresh when you study.
7 selected textures and 17 plain colors (random) x 16 different colored circles = 384 combinations!

- Circle of 5ths Analog Clock

· 8 points of the compass & angle degree display

- Enharmonic keys
Enharmonic notes are important in music as is key signature.

- Key signature quiz
Quick & simple test and check the answer immediately.

- Intervals Tables
All possible intervals are organized in one page. Simply scroll up and down to see other intervals on the page. You can listen to the harmonic and melodic sound of the intervals with the musical notation and letters.

- Mastering Circle of 5ths and key signatures
- Mastering all triads and scales
- Improving aural perception
- Better in chord progressions
- Better in transcription and arrangement of music
- Musical confidence and improvement in teaching music
- Much more

**** Features (Table of Contents) ****

1. Circle of 5ths
· Flat keys, Major enharmonic, Major, All keys, blank, minor, minor enharmonic and sharp keys
· Circle of all – 2nds, 7ths, 4ths, 3rds and 6ths
· All Key signatures
· 32 Circle colors
· 60 different backgrounds
· Spotlights (iPad)
· Guide rotation
· 8 points of the compass & angle degree display

2. Circle of 5ths Analog Clock

3. Key Signatures
· All key signatures with sound!
· 3 clefs – treble, alto and bass
· Enharmonic key signatures
· Scale degree names in Major and minor

4. Key signature quiz

5. Intervals
· All possible intervals with the sound and musical notations
· Note name in the letter
· Harmonic and ascending, descending intervals to hear
· Intervals table in detail (P1-P8)
· Intervals summary (P1-P24)

6. Triads
· Complete triads in 5th with the sound (both chord & arpeggio)
· Inversions – root, 1st and 2nd with figured bass
· Selectable note
· Drag and Drop

7. Scales
· Major, natural, harmonic and melodic minor with the sound (fast/normal tempo)
· Accidentals and key signatures
· Slurred
· Solfège – both fixed & movable do (useful for sight singing)

8. Drag & Drop
· Practice key signatures and chord progressions

9. More
· Key signature matrices – order of sharps & flats and others
· Formulas with sound (Tone/Semitone, Whole step/Half step, Notation)
- Modes
- Chords
- Scales
· The Overtone series with sound

Memorizing and visualizing the circle is always highly recommended.
If you have any questions or issues, please visit the link provided for support.

What’s New

Version 15.3.2

· Bug fixes

Ratings and Reviews

Red Keep ,

Waste of money...

This app has way too much fluff, not worth the money spent.

App Privacy

The developer, Eun Jae Lee, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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