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PROS is a lightweight and fast alternative operating system for the VEX Cortex Microcontroller. It features multitasking, low-level control, and Wiring compatible functions to harness the full power of the Cortex. With a real-time kernel based on FreeRTOS and a development environment built on Eclipse CDT, PROS uses proven software to increase the reliability and usability of the VEX development system across all three major computing platforms.

PROS is currently under active development to make it usable for VEX high school and middle school teams. PROS is intended for advanced VEX users seeking to move beyond competing environments.

Eclipse and FreeRTOS have their own licensing agreements. Please see and for details.


  • Lightweight and fast, intended for advanced VEX users to fully utilize their hardware
  • Competition legal with over four years of tournament-level testing
  • Function aliases compatible with Wiring/Arduino reduce learning curve

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BSD License

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User Ratings

ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 5 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 5 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5

User Reviews

  • An excellent piece of software, we use it for almost everything vex now.

  • PROS is awesome. I use it in all my vex programming projects.

  • This is a great piece of software. Heretofore, I have been using easyC for my competition robot. Even with the easyC text editor, there are still many limitations on what you can and cannot do. PROS offers more freedom and a more intelligent design for a robot programming interface. However, I did have some trouble finding sufficient documentation for a few of PROS's features, but everything was simple enough to figure out with minimal effort. I will be using PROS for all of my robots henceforth.

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Additional Project Details



Intended Audience

Advanced End Users

Programming Language

Assembly, C