Calcoo is a scientific calculator designed to provide maximum usability. The features that make Calcoo better than (at least some) other calculator programs are:

* bitmapped button labels and display digits to improve readability
* no double-function buttons - you need to click only one button
for any operation (except for arc-hyp trigonometric functions)
* undo/redo buttons
* both RPN (reverse Polish notation) and algebraic modes
* copy/paste interaction with X clipboard
* display tick marks to separate thousands
* two memory registers with displays
* displays for Y, Z, and T registers