Last year I made a wine cataloging app for iOS based personal gripes that I had with all the others out there. I just wanted something incredibly simple, and all the others were ugly and complicated.

I was inspired by the 7 minute workout app posted here, and set aside 8 hours to build the whole thing. All told I ended up spending about 40 hours on it and haven't really touched it since.

I started selling it at $.99, but sales were slow and I wasn't really making anything at all off it. So I raised the price 5x to $4.99 and sales didn't really change much. Now it brings me in about $50-150 / month that I use as extra cash toward paying off my student loans.