Music Theory Roman Numerals

Nick Rose

About this app

This app produces a random triad or seventh chord on a musical staff with a random key and clef. Random! Four buttons, each affixed with a Roman numeral, are displayed beneath it . Use your knowledge of music theory to decide which one correlates best to the aforementioned chord and give it a confident tap.


Types of chords you'll get include:
All possible diatonic triads and seventh chords in every inversion
Applied dominant seventh chords
Modal mixture triads
Altered dominants (augmented and diminished, denoted by + and -, respectively) both as triads and seventh chords
Augmented sixth chords


A score at the bottom left of the screen keeps track of your progress and can be reset at any time. If the chords being generated are too advanced or if keys like D#-minor and Cb-major are too difficult/annoying, you can customize the output using the settings button on the bottom right of the screen.


Note: this program only interprets the chords at face value. It does not understand passing chords or suspensions; analyze accordingly. For example, a C-major chord with G as the bass note will have to be answered as I6/4 and not V6/4 (wherein the latter chord is understood as a typical cadential 6/4).

Ratings and reviews

Couldn't really understand what it was trying to do. It gives approximations to chords, a lot of guessing. I can only see that you're being taught to quickly identify chords inaccurately. Can't see the point in that

Excellent specialist music theory App, but very tricky to get all the answers right! We need a way to remember the inversions of 7ths!

Your choices should have more inversions for same root. Now it is enough just to figure the root to pick the only choice with that root

What's new

1.2 Added applied chords, modal mixture chords, altered dominants, augmented 6th chords, and a new settings button to enable/disable inclusion of these new chords

1.1 Minor display bug fixed. Layout optimized differently for multiple screens

1.0 Uploaded app