The calculator works with a rotating screen that stores your last calculations and results. It supports more than forty functions including algebraic, transcendental, trigonometrical, hyperbolic and financial. Chances are that if you can't solve a mathematical equation with this calculator, then you won't be able to solve it with anything.
AllerCalc also includes different options that allow you to choose the sources, format (general or scientific) and select the number of decimals to visualize. You can even make metric conversions and much much more. A powerful calculator for that need some serious mathematical power.