Great Cow BASIC is an open-source BASIC compiler for 8 bit Microchip PIC and Atmel AVR microcontrollers. Also included in the project is Great Cow Graphical BASIC, an icon based editor for GCBASIC programs.

The latest release is September 2017. We are even closer to v1.00 release!!

Please see the download section for your options. We have a Graphical IDE and textual IDE, we have just the compiler and we have a minimal install - it is your choice.

Please see the homepage here: and also see for other Great Cow Basic download options.

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User Reviews

  • A very easy to use compiler. More features added regularly. Produces fast asm for pic and avr with same basic code. Good alternative to using C++ . Ideas become real quickly.

  • I have been following this project for a long time. The BASIC language is very simple to use and Great Cow BASIC compiles to get a code for highly optimized AVR and PIC microcontrollers. It is important that the same source code can be used with very few changes in these two popular families of microcontrollers.

  • Outstanding BASIC compiler for 8bit PICs and AVRs! This compiler is constantly being improved by very proactive developers. You can really take full advantage of the micro's capabilities and there is also an easy to use PPS tool to configure the pins on the newer PICs. This allows you to reassign pins which comes in handy while developing a PCB for your project. GCB is one of my favorite tools for programming, it really has come a long way and creates incredibly efficient asm. Try it... you'll love it!

    1 user found this review helpful.
  • Great effort by GCBasic developers and contributors. Hope to see more features in future versions. There is always room for improvement.

    1 user found this review helpful.
  • Responsive Community

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Additional Project Details


Italian, English, Turkish, German, Spanish

Intended Audience

Education, Developers

User Interface

.NET/Mono, Command-line

Programming Language

Visual Basic .NET, BASIC