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FreeRTOS Real-time operating system for microcontrollers

Developed in partnership with the world’s leading chip companies over an 18-year period, and now downloaded every 170 seconds, FreeRTOS is a market-leading real-time operating system (RTOS) for microcontrollers and small microprocessors. Distributed freely under the MIT open source license, FreeRTOS includes a kernel and a growing set of IoT libraries suitable for use across all industry sectors. FreeRTOS is built with an emphasis on reliability and ease of use.

Why FreeRTOS?

  • Trusted kernel

    With proven robustness, tiny footprint, and wide device support, the FreeRTOS kernel is trusted by world-leading companies as the de facto standard for microcontrollers and small microprocessors.

  • Accelerate time to market

    With detailed pre-configured demos and Internet of Things (IoT) reference integrations, there is no need to determine how to setup a project. Quickly download, compile, and get to market faster.

  • Broad ecosystem support

    Our partner ecosystem provides a breadth of options including community contributions, professional support, as well as integrated IDE and productivity tools.

  • Predictability of long term support

    FreeRTOS offers feature stability with long term support (LTS) releases. FreeRTOS LTS libraries come with security updates and critical bug fixes for two years. Maintained by AWS for the benefit of the FreeRTOS community.


Tiny, power-saving kernel

Scalable size, with usable program memory footprint as low as 9KB. Some architectures include a tick-less power saving mode

Support for 40+ architectures

One code base for 40+ MCU architectures and 15+ toolchains, including the latest RISC-V and ARMv8-M (Arm Cortex-M33) microcontrollers

Modular libraries

A growing number of add-on libraries used across all industry sectors, including secure local or cloud connectivity

AWS Reference Integrations

Take advantage of tested examples that include all the libraries essential to securely connect to the cloud

MIT licensed, with options

FreeRTOS can be used for any purpose under its MIT license. Our strategic partner also provides commercial licenses, and safety certification.

FreeRTOS partners

Latest posts

  • FreeRTOS roadmap and code contribution process now published on

    Starting today, the FreeRTOS roadmap is published on and GitHub. With this update, you can transparently access information on specific FreeRTOS features and have a consolidated view of upcoming, ongoing, and shipped FreeRTOS projects to plan your projects accordingly. In addition, you can track your requested FreeRTOS feature requests or the projects you have […]

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  • OPC-UA over TSN with FreeRTOS

    At Smart Production Solutions (SPS) fair in Nuremberg in November 2022 a group of 8 partners - Analog Devices, Arm, Amazon Web Services (AWS), B&R Industrial Automation, Lattice Semiconductor, Schneider Electric, Texas Instruments and NXP - announced a working group to create a permissive and open source Open Platform Communications United Architecture (OPC UA) over […]

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  • FreeRTOS-Plus-TCP with unified IPv4 and IPv6 functionalities and multi-interface support now generally available

    We are excited to release FreeRTOS-Plus-TCP v4.0.0 with unified IPv4 and IPv6 functionalities and multi-interface support as generally available. Developers can now use the FreeRTOS-Plus-TCP library for IPv6-based embedded applications, design applications that use multiple network interfaces, and choose combinations of IPv6, IPv4, TCP, and UDP within the same library to optimize for memory footprint. […]

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  • Previewing the new Arm Corstone FreeRTOS Featured Reference Integration

    Most people know Arm for our hardware designs and our Cortex CPUs, but our ongoing commitment to the software ecosystem that enables this hardware is just as critical. It's really important to us that developers can easily take advantage of the latest features of our CPUs, ML accelerators and other system IP. Because FreeRTOS powers […]

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