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The FreeRTOS™ Kernel
Market Leading, De-facto Standard and Cross Platform RTOS kernel.

Immediate Free Download and Use * Feature Rich * Tiny Footprint * Easy To Use Pre-configured Projects * Can Be Used In Commercial Applications * Massive User Community * Free Support * Optional Commercial Licensing/Support * Strict Coding Standard * Safety Critical Version Available * Tickless Mode for Low Power Applications

Developed in partnership with the world's leading chip companies over a 15 year period, the FreeRTOS kernel is a market leading real time operating system (or RTOS), and the de-facto standard solution for microcontrollers and small microprocessors.

With millions of deployments in all market sectors, blue chip companies trust FreeRTOS because it is professionally developed, strictly quality controlled, robust, supported, free to use in commercial products without a requirement to expose proprietary source code, and its IP is carefully managed.

The FreeRTOS value proposition . . .
Things you might not know about FreeRTOS . . .
Why choose FreeRTOS? . . .


Did you know?

  • FreeRTOS is downloaded every 120 seconds (on average, during 2017).
  • FreeRTOS came top in class in every EETimes Embedded Market Survey since 2011, which was the first year it was included.
  • FreeRTOS offers lower project risks and a lower total cost of ownership than commercial alternatives because:
  • Some FreeRTOS ports never completely disable interrupts.
  • For strict quality control purposes, and to remove all IP ownership ambiguity, official FreeRTOS code is separated from community contributions.
  • FreeRTOS has a tick-less mode to directly support low power applications.
  • FreeRTOS is designed to be simple and easy to use: Only 3 source files that are common to all RTOS ports, and one microcontroller specific source file are required, and its API is designed to be simple and intuitive.
  • The RL78 port can create 13 tasks, 2 queues and 4 software timers in under 4K bytes of RAM!


Why choose FreeRTOS?

"It's probably safe to say at this point that FreeRTOS goes through more 'peer-review' than any other RTOS available on the planet. I have used it in several projects - one of which was a multiprocessor environment that used more than 64 processors and needed to run for months reliably. The RTOS core performed well. Take FreeRTOS for a spin." - John Westmoreland

FreeRTOS provides the best of all worlds: FreeRTOS is truly free and supported, even when used in commercial applications. The FreeRTOS open source MIT license does not require you to expose your proprietary IP. You can take a product to market using FreeRTOS without even talking to us, let alone paying any fees, and thousands of people do just that. If, at any time, you would like to receive additional backup, or if your legal team require additional written guarantees or indemnification, then there is a simple low cost commercial upgrade path. Your peace of mind comes with the knowledge that you can opt to take the commercial route at any time you choose.

Here are some reasons why FreeRTOS is a good choice for your next application - FreeRTOS...

  • Provides a single and independent solution for many different architectures and development tools.
  • Is known to be reliable. Confidence is assured by the activities undertaken by the SafeRTOS sister project.
  • Is feature rich and still undergoing continuous active development.
  • Has a minimal ROM, RAM and processing overhead. Typically an RTOS kernel binary image will be in the region of 6K to 12K bytes.
  • Is very simple - the core of the RTOS kernel is contained in only 3 C files. The majority of the many files included in the .zip file download relate only to the numerous demonstration applications.
  • Is truly free for use in commercial applications (see license conditions for details).
  • Has commercial licensing, professional support and porting services available in the form of OPENRTOS from our partner WITTENSTEIN high integrity systems.
  • Has a migration path to SafeRTOS, which includes certifications for the medical, automotive and industrial sectors.
  • Is well established with a large and ever growing user base.
  • Contains a pre-configured example for each port. No need to figure out how to setup a project - just download and compile!
  • Has an excellent, monitored, and active free support forum.
  • Has the assurance that commercial support is available should it be required.
  • Provides ample documentation.
  • Is very scalable, simple and easy to use.
  • FreeRTOS offers a smaller and easier real time processing alternative for applications where eCOS, embedded Linux (or Real Time Linux) and even uCLinux won't fit, are not appropriate, or are not available.

FreeRTOS Announcements Mailing List

You can keep up to date with very occasional FreeRTOS announcements by adding yourself to the FreeRTOS mailing list. Emails are infrequent and kept short. We respect your privacy, so do not provide email addresses to any third party, or any other Amazon Web Services organisation. Every email sent contains unsubscribe instructions.

You can also now follow FreeRTOS on Twitter for instant notifications.

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Latest News

NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.

Meet Richard Barry and learn about running FreeRTOS on RISC-V at FOSDEM 2019

Version 10.1.1 of the FreeRTOS kernel is available for immediate download. MIT licensed.

View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS.


FreeRTOS and other embedded software careers at AWS.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Espressif ESP32

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers


STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS

Xilinx Microblaze and Zynq partner

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