Clear has unlockable themes

Clear, the productivity app from RealMac Software has a beautifully designed interface. It is minimalistic, elegant and efficient. One of its interesting features is the use of themes, which can completely change the colors of the app.

There are five themes to start with, and many more that can be unlocked. I’ll let you figure out how to unlock these themes, but if you want a hint, take a look at the names in the screenshot: