I’ve been a big fan of Calcbot for a long time, but there’s always room for new calculator apps. An interesting one I just came across is Llumino, which somehow manages to combine simple calculations with a dance floor aesthetic. Tap the buttons, and the area around them will light up in a psychedelic way. The calculation area is also quite animated, as you can see in this video, and like Calcbot, Llumino keeps a history of your calculations (up to 100). Only $2 on the iOS App Store.