UniCount - Scientific calculator that allows to make calculation of any complexity. It supports input of fractions, exponentiations, roots of any degree, contains 16 trigonometric functions, stores the answers and expressions, and allows to make all calculations with complex numbers. The widget allows to calculate even if the device is locked.
Supported gestures:
    Swipe - swipe keyboard or expression;
    Pinch on the keypad - transformation the keyboard to compact form when the device is oriented vertically;
    Go to Settings and Turn on "Allow full access" for UniCount keyboard in order to use shared calculation history
You can choose your design