I have created a chord sequence generator app for Android. It uses offline #math and #logic to create inspiring progressions. You can export MIDI files and/or hook up your phone in MIDI controller mode, playing sequences straight into your DAW or Virtual Instrument.
"Motivic MIDI" currently sits in Google Play Console closed testing waiting area. Would you like to help me launch this thing? The link above is to my site, which contains a video demo. Thanks for considering it!