Wolfram Alpha is described as '"Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer' and is a very popular Calculator in the education & reference category. There are more than 50 alternatives to Wolfram Alpha for a variety of platforms, including Web-based, Android, iPhone, iPad and Windows apps. The best Wolfram Alpha alternative is fxSolver, which is free. Other great apps like Wolfram Alpha are Mathematica, Numbat, Symbolab Math Solver and Soulver.
Supercalc is an expression calculator for Windows. An expression calculator gives the user the ability to type an equation exactly as it is to be evaluated. This allows for much more intuitive use of the calculator.
