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RTOS Source Code Download Instructions

Follow the steps below to download the latest FreeRTOS versions:
  1. Please keep up to date by joining the announcements mailing list for infrequent comprehensive notifications. We respect your privacy, so do not provide email addresses to any third party. Every email sent contains unsubscribe instructions.

  2. Download the latest official release or a previous release from SourceForge, both of which are available as a standard zip file (.zip), and as a self extracting zip file (.exe). Alternatively obtain the source files directly from SVN.

    The FreeRTOS kernel is also available from AWS and via Github as part of the Amazon FreeRTOS operating system, and from various partner distributions.

  3. Unzip the source code into a suitable directory - taking care to ensure the directory structure within the zip file is maintained. Please read the source code organisation and quick start guide pages to understand the directory structure and get up and running quickly.

  4. The monitored support forum, known issue list, FAQ and version change description, all provide additional resources.

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.

Known Issues with the Current Release


Legacy Issues

Please also see security patches.
  • Coldfire V2 CodeWarrior port

    The Coldfire V2 CodeWarrior code will not run with the latest (Eclipse) based CodeWarrior tools. A fix is posted on the support forum (post 4), and will be incorporated into the main release in due course.

  • Coldfire V1 CodeWarrior port

    The Coldfire V1 CodeWarrior projects will not automatically update to later CodeWarrior versions unless all unnecessary files are deleted from the FreeRTOS/Source directory first. See this support thread for more information.

  • MSP430 CrossWorks and GCC demos

    The CrossWorks demo has not yet been updated to use CrossWorks V2.0 or later. The GCC demo has not yet been updated to use the latest MSPGCC compiler version.

  • AVR32 demos

    The IAR Embedded Workbench demos for the AVR32 will not currently build if you are using a later version of the IAR tool chain. The issue is caused by changes to macro names within the compiler header files.

  • Silicon Labs SDCC ports

    Unfortunately these will not work with the latest compiler versions. The compiler version used to generate the port is now rather old, but is stated on the port documentation page.

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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