You can try out chord progressions in countless ways and if you want export to midi.
One thing that I found captivating was the possibility to choose a scale and it lists all the chords that can be played using that scale... This must be one of the easiest way to compose, to have an impressive array of chords or to find some more exotic chords knowing that they will go with your melody you have made.
You could just sit with it open on your device while you work with another device or computer.
In general it has a lot of use and there is videos to look at to find out if it is something you would be