If you are going to calculate, do it in style! Greater Calculator is the most customizable calculator around. Probably. It allows you to rearrange all of the buttons, so you can create a layout that works for you. Just drop one button on top of another to swap, or drop that button into an empty space. Change the color of any button by dragging the color swatches from the top of the screen onto your target. Mix your own colors by tapping a swatch and changing its red, green, and blue values. The three color swatches give you a palette to work with, so you don't have to remix your colors constantly.