Harmony helper is a simple web app that allows to get all scales and modes that fit a chord progression. Enter your chords and see the result.
The next step will be to generate example of melody that fit with the chords.
The algorithm use the java library libjamu for the music theory, the interface is made with bootstrap 3 and the play framework is used for the server side.
You can see the app online at http://harmonyhelper.herokuapp.com.