Lifetime musician’s companion!

• New Additions
- The Guide: 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 (not rotate the circle!!) to see how they relate with other keys (Hint: Double tap - return to original position).

- Intervals Tables:
All possible intervals are organized (over 290 intervals) 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.

- Change background:
You can now change background. Try a different background whenever you want, it is fun! Feel fresh when you study - 7 textures and 40 plain colors (random) x 12 different colored circles = 564 combinations!

- Ornamentation & Spotlights

- Key Signature Quiz

- 12 Zodiac signs

- Circle of 5ths Analog Clock

· 8 points of the compass & angle degree display

• Improvements
- New design and User Interface (UI)
- About 25% louder in sound
- Performance: built with the latest tools and technology available
- User interactions
- Scales: added both accidentals and key signatures
- Triads: 1st, 3rd and 5th notes can be selectable which is useful in the inversions

• Changes
- Supports only portrait mode for optimal performance and stability

The ultimate goal of this app is to master the comprehensive musical materials with ease. For example, the interval itself is a pretty wide area, which takes perhaps a lifetime to learn. This app breaks down intervals into as small units as possible in order to that you can achieve them in a step-by-step manner.

• Main benefits
- 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 ****

1. Circle of 5ths
i. Flat keys, Major enharmonic, Major, All keys, blank, minor, minor enharmonic and sharp keys
ii. Circle of all – 2nds, 7ths, 4ths, 3rds and 6ths
iii. 23 Circle colors
iv. Over 40 different backgrounds to choose from
v. Spotlights (on/off) - iPad version only
vi. Ornamentation (on/off)
vii. Guide rotation
viii. Geometry (new)
ix. 8 points of the compass & angle degree display

2. 12 Astrological/Zodiac signs
i. Chromatic circle
ii. Circle of fifths
iii. 12 zodiac signs, their dates & elements

3. Key Signatures
i. Complete key signatures with sound!
ii. 3 clefs – treble, alto and bass
iii. Enharmonic key signatures
iv. Scale degree names in Major and minor

4. Triads
i. Complete triads in 5th with the sound (both chord & arpeggio)
ii. Inversions – root, 1st and 2nd with figured bass
iii. Selectable note

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

6. Intervals
i. All possible intervals with the sound and musical notations
ii. Note name in the letter
iii. Harmonic and ascending, descending intervals to hear
iv. Intervals table in detail (P1-P8)
v. Intervals summary (P1-P24)

7. More
i. Key signature matrices – order of sharps & flats and others
ii. Formulas with sound
- Modes (iPad)
- Chords
- Scales
iii. The Overtone series with sound

7. Key Signature Quiz

Memorizing and visualizing the circle is always highly recommended. If you have any issues, please use the app support link.
Good luck on your long musical journey and life long learning!

What’s New

Version 14.1

· Bug fixes and stability improvements

Ratings and Reviews

4.0 out of 5
1 Rating

1 Rating

doublebassrainbow ,

Very Niche App

Best suited for Intermediate to Advanced musicians.

There is no manual to navigate through all of features. (Maybe an update will add one?)

Exploring is fun and lends itself to making new connections on your own rather than spoon feeding the material. That being said it does feel like a tower of paperwork is neatly stacked yelling "learn from me!"

It contains core concepts you need to become a working professional musician. So if that's your goal in life than, no matter the level, this might as well be the app you keep for the rest of your life to reference, reflect and study.

The developer really understands the importance of the circle of fifths and this definitely looks like overkill but it's not. A real hidden gem.

Unique Layout
Many Areas of Exploration
Sooooo Much Information!!!!!!

No Manual/Guide
Not Intuitive / User Friendly
No Labels (icons can stay if there is a manual)

*Suggestion: Create a legend and/or manual with some footnotes so we can make connections a little easier as everyone learns at a different pace. Will change my review to 5 stars if that happens.

Missysun ,

Don't like

There are no instructions and it's too hard to understand

Developer Response ,

Thanks for choosing Circle of 5ths app. You wrote your review in December 2014 . This App has been improved tremendously since your rating, so if you are happy with my work, may I ask that you leave a positive review? I greatly appreciate it and it takes but a few seconds of your time.


Eun Jae Lee
220.9 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

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

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