Divided
Divided was my first iOS application. In 2011, writing a tip calculator, especially one with nice animations, was enough to get you featured by Apple in their App of the Day slot. Divided sold at $2.99 originally, I think, and made over $1,000 during that day of being featured, before dropping into obscurity.
I stopped updating it in 2014, after updating my hacky animations for different screen sizes became too much to handle.
I originally called the app Tipvetica, as it was full of Helvetica, but I decided this would likely cause problems. But I have a couple of screenshots of early versions with that name:
