"Chromatic Button Accordion Chords" is an essential tool for understanding the chromatic button accordion (c-system or b-system) and displays or plays simple and complex jazz chords on the button-board for all keys.

In the main interface you see a chromatic button-board and a selector for keys and chords.

After the chord selection all corresponding buttons are marked with single color or multi colors. Optionally the chord can also be played as a sound.

All buttons are touch responsive and play the corresponding sound when touched.

You can choose between the display of *chords* und *intervals! The intervall-mode can be used to train your ear. In the interval-mode you. It can also be used to memorize the 4 different paths that lead from the base-tone to the interval-tone.

In its settings you can configure:

- the chromatic system (c-system, or b-system)
- the button naming (c,d,e ... or do, re,mi ...)
- the mode (chords, intervals)
- the chord coloring (single or multicolor for easy recognition of root, triad, fifth, seventh etc.)
- c-key halftones color in dark-gray or white
- the autoplay feature after chord selection
- Instrumen selection for audio playback: accordion, bandoneon, jazz organ, vibraphone

Search for chords in iOS Spotlight (outside the app) and open the app for displaying a selected chord from the search result.

This application trys to help you in playing a real instrument. It's not intended to replace a real instrument!

What's New

Version 1.3.1

Minor bugfixes


Martin Koller
34 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad and iPod touch.
English, French, German, Spanish
Age Rating
Rated 4+
© Martin Koller
2,29 €


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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