Launched "Cadence: Guitar Theory" (https://cadenceguitar.com/) a guitar learning app with a focus on music theory in September.

Currently right above that $500/month when including lifetime purchases. Had a sizeable bump in October thanks to blowing up on here which also gave me an app store boost so thanks guys :)

I'm working on new lessons at the moment, after that I'll probably try to improve on the animations and sound effects to give the app more "juice", should be a fun thing to work on. Also still trying to figure out marketing and how to get visibility overall...