chordreps.com
FYI when I went through the third cycle of it, it got stuck cycling through keys but repeating the major arpeggio followed by the note to identify being the ii pattern probably 4 times. Not sure if that was random chance or an actual issue...but very cool. Where is the code? I'd love to star it so that I remember to keep an eye on it..or even drill myself every now and then haha.
This probably won't mean much to a lot of people here, especially since there is sort of an assumed level of understanding going in (scale degrees, roman numeral chord notation with uppercase for major and lowercase for minor, or what a cadence is or what those different types of cadences are) but for those of us that went to music school...especially those who hadn't had a traditional music education from an early age with ear training...definitely would have actually drilled myself with this.