A professional application for Jazz and Pop Musicians, as well as for all music students. An excellent method to learn chord notes without your instrument.
A keyboard is available to play the chords: that is why this application is excellent for pianists. In a train, on a plane or while you are waiting in a line, you can exercise on which notes are in a dominant chord or how to play a IIm7, V7, IΔ progression.
The application has three sessions:

INTERVALS: select an interval from a list and guess the missing notes. All matrixes should be read from bottom to top, like on a music sheet.

CHORDS: choose one chord type and then guess the missing notes. The more you exercise, the more you internalise the chord structure. Each chord matrix should be read vertically from bottom to top, like when you read a music sheet. It can be solved by playing the notes on a virtual keyboard. It the note you play is correct, it turns blue; if it is wrong it stays red for a moment and you should try again.

CHORD PROGRESSION: select the progression you would like to work on and play the chords one by one as indicated by the progression roman numerals.
All exercises have a help button that shows the solution. A simple video in the app explains all the functionalities. If you want to learn music chords, this is the app for you.