Cali is a new calculator app that uses gestures to perform simple math functions. You can add, subract, multiply and divide using different swipes across the number pad. Simply type in your number and perform a gesture on the number pad for the desired function. Addition is an upward swipe, subtraction is a downward swipe. Multiply with a swipe to the right, and divide with one to the left. There are also a couple of gestures in the black output area. Holding down on the output will copy the number to the clipboard, while a swipe to the left on the output will delete the last number.
For those that don't want to use gestures, small addition, subtraction, multiplication, and division buttons sit across the bottom of the output area. Cali is also capable of more advanced functions. hit the More button to find the square, cube, square root, sine, cosine, and more. Additionally, the section labled "Pro Tips" will tell you about the gestures if you need it.
Cali is available as a universal app, and can be downloaded from the App Store now.