The Perfect RTOS for Startups

Makers, pre-revenue start-ups, educators, and hobbyists can use our
commercial real-time operating system for free. Your project deserves Micrium's unparalleled reliability, performance and dependability.

Makers & Start-Ups

A Maker License allows qualified startups, educational institutions, and home users to embed the Micrium RTOS into their projects. Contact us for specifics about eligibility.

Partners & Design Houses

A Partner License allows Micrium Certified Partners to embed the Micrium RTOS into proof of concepts and demos for no cost.


An Education License allows accredited educational institutions to use the Micrium RTOS for course projects, and use Micrium's books in your curriculum.

Real-Time Kernel


Micrium’s µC/OS-III is a highly portable, scalable, preemptive, real-time, deterministic, multitasking kernel for microprocessors, microcontrollers and DSPs.

Learn more about Micrium’s real-time kernel

Communication Software

TCP/IP Networking

A compact, reliable, high-performance TCP/IP protocol stack. Features dual IPv4 and IPv6 support.

Learn more about TCP/IP support

USB Host and USB Device

Real-time USB Host and Device software stacks designed for embedded systems equipped with a USB Host or OTG controller.

Learn more about USB support

File System

A compact, reliable, high-performance and thread-safe embedded file system for CPUs, MCUs, and DSPs.

Learn more about Micrium's file system


A CAN protocol framework that enables easy and clean implementation of CAN communication paths.

Learn more about Modbus support

License Types

License Type Startups & Hobbyists Partners & Design Houses Educational Institutions Commercial
Who Qualifies Private home use /
<$100K revenue /
<$300K funding
Micrium Certified Partners Students and educators at accredited educational institutions Companies
>$100K revenue
or >$1M in funding
Cost $0 and rights to name as customer $0 for proof of concepts, or contributing ports and drivers $0 License cost varies by type; royalty-free
TCP/IP Module
USB-Device Module
USB Host Module
Modbus Module
File System
CAN Module
Graphical UI
Building Blocks
Free Training Seminars Space permitting
Training Materials
One-Year Maintenance

Ported to Over 50 Architectures

µC/OS is Available for Your Platform


For a complete list of current architectures supported, visit the Micrium Download Center.
Contributed ports and drivers are welcome.

Download µC/OS for Makers and get working today