[lukebyear]

I built Strum Machine (https://strummachine.com) which is a music practice tool aimed at players of bluegrass, old-time, folk, etc (the music sub-culture I grew up in). I started working on it only after having failed to find an existing product like it and wanting one to be available for my music students. Development began in Jan 2016, launch was May 2016. Built with the Meteor Javascript platform as a mobile-friendly website; native apps still in (very slow) development. About 300 paying users, mostly through word of mouth; it's been hard to figure out how to do marketing otherwise. Just cracked 1k MRR. Minimal ongoing costs and maintenance, although I still have a looong list of improvement-related TODOs. It's been an extremely rewarding project to be working on, and the extra income has been a very nice bonus as well. :-)