DaySince let's you track how many days since something happened. The first time you started going to the gym. Or the last time you ate carbohydrates. Everyone could use the freemium app to create the event, a description, a date, then let you pick from one of the available visual themes. For an upgrade, you could create your own themes, sell them, as well as count how many days until another date. Each calendar could have its own theme that fit the subject matter rather than forcing an app-wide theme change. DaySince was some peak skeumorphism for me. I don't even wanna tell you how much time I spent on that little open/close camera icon in the toolbar. My team each got to contribute their own themes, like John Gholson's lonely astronaut or Brandon Schaffner's badass nixie tubes!