Quinterval is an interactive circle of fifths including the display of the corresponding scales.

A key in the circle can be selected either by touching the tonic or by turning the slider in the middle. The circle displays both the respective major and parallel minor scales. The display ranges from F-flat major (D-flat minor) to G-sharp major (E-sharp minor). A second slider can be used to move the visible circle section accordingly.
The note names can be set between german, english or italian notation.

The lower area shows the related major scale with its key signature. The first step and the sixth step with the corresponding minor scale are highlighted. The notes can be displayed with G-Clef, C-Clef or F-Clef. The accidentals can also be displayed before the individual notes.

Additional functionality is available as an InApp purchase:
- Display the notes of the parallel minor scale
- Display triads with their chord names
- Playback notes by tapping on them

What’s New

Version 2.1

The circle can now display scales from F-flat major (D-flat minor) to G-sharp major (E-sharp minor). The visible part of the circle is adjusted by an additional slider
Also, the design was modified a little bit.

Ratings and Reviews

4.4 out of 5
12 Ratings

12 Ratings

Nate4129 ,


Support for tenor clef would be nice but other than that great app.

jlh16345 ,

Update created errors

Most recent update as introduced errors in the scales....not all notes are shown with the sharps of the key signature
Update: after providing the initial review the developer was quick to act on my comments and fix the errors!

Developer Response ,

Thank you for your feedback! The last update (V1.7.1) fixes a format issue that hopefully solves your problem. If not, please let me know!

amgk719 ,


This is exactly what I need. I have the option to view the bass clef and see all the notes including the Nashville number system. It’s so handy. Thanks for this app. Love it


Oliver Hahn
10 MB

Requires iOS 12.4 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Spanish

Age Rating
In-App Purchases
  1. Enhanced Version $0.99


  • Family Sharing

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

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