RedCrab Calculator

RedCrab Features

RedCrab Calculator is a mathematics software with fullscreen editor for the free placement of algebraic formulas on the worksheet in mathematical notation.

Results can be displayed in different numeric formats and in diagrams. Images and texts can be inserted.



RedCrab worksheets are also suitable for presentations.

The freeware contains about 70 functions for technical and scientific calculation of individual values and data fields.



RedCrab, Download at heise



RedCrab is portable

USB Stick The RedCrab Calculator is portable. No installation is required. RedCrab starts from external disk, e.g. USB flash drive or CD / DVD. Program settings are stored in the start directory.


System requirement

Version VI

(Framework 4.0 or higher.)
Microsoft Windows XP, Vista, W7, W8.x, W10

RedCrab Version V4.13

RedCrab bis Version 4.13 runs with operating system Linux with Wine runtime system.
download V 4.13



Online User Manual

Online Manual

The RedCrab Calculator User's Guide can be found here. It contains descriptions for handling and more than 250 math functions.

The online help for the individual functions can be called up directly from the program with a mouse click or with the F1 key

Upgrade RedCrab PLUS

Upgrade to RedCrab PLUS The shareware RedCrab PLUS extends the range of functions with additional functions for statistics, finances, matrices and special applications, as well as calculating with complex numbers and units of measure. Plotting of 2D graphics and charts.

Free RedCrab PLUS Key

The functions of the RedCrab PLUS full version can be activated free of charge for testing on a daily basis. For trial code click here.