The gains a new engineering layout, with hyperbolic trig functions, hypotenuse, leg, gamma, delta percent, and more; a theme taken from the OS X version of PCalc; and six new key click sounds you can choose from.
The update adds two new key click sounds, and includes other small improvements as well.
The adds all of the calculator themes from the iPhone version; includes an updated Dashboard widget; and adds a collection of additional unit conversions including a new cooking section.