JIT calculator is a calculator that calculates the expression you type live, without waiting for you to press enter. It does not callback to server and it is keyboard focused. It allows easy copy paste from any part of either input or output. It supports basic functions, trigonometrical functions, algebra, probability, statistics functions and others.
The user interface layout uses bootstrap but the design needs to be improved somewhat. Otherwise, it is completely functional.
It displays the result in binary and in hex too and supports measurement units too.