Calculators have existed in various forms since time immemorial for our assistance and help starting out from abacus and slide rule for mathematical calculations. Nowadays, calculators are portable than computer systems and come in different sizes along with first of its kind was introduced in the early 1800s and since then there has been a steady rise in the creation of digital variety with enhanced designs and features. Powered by batteries and solar cells such calculators have now become relatively cheap and user friendly that can be used anywhere. However, with the coming of coming systems, and its specific calculating functionalities which can be accessed in a jiffy. RedCrab 1.01 is one such calculator with multiple features and tools making it an immensely constructive utility.

RedCrab opens with a neatly arranged interface with the chief options placed at the top panel and immediately below are placed the various formulae for varied calculations. The mathematical expressions are not typed in the command line, but in the editor window to have any calculation done in a jiffy. The result is displayed either under or next to the expression. The handling of this application is easier than any conventional calculator as it comes with a full screen editor and supports major complex algebraic equations along with fractions and exponents. Further, it also successfully tackles square roots and other scientific applications with technical problems with 諡n. Moreover, several mathematical functions can be written on the same page and even create a whole arcade of sorts by saving multiple formulae for reference and also import drawings in Bitmap format from external mediums for suitable assistance.

To sum up, RedCrab comes across as a practical solution to solve any mathematical problem effectively with flexibility to save formulae for future reference and hence it gets a rating score of 3.5 points for its viability and user friendly working.