Checkout what's new in the FreeRTOS 202011.00 release!

Quality RTOS & Embedded Software

FreeRTOS Real-time operating system for microcontrollers

Developed in partnership with the world’s leading chip companies over a 15-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. Instantly 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.


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

  • What’s new in the 202011.00 FreeRTOS release

    We are happy to announce the 202011.00 FreeRTOS release is now available for immediate download. This release brings in a number of new features and capabilities by graduating libraries from the published LTS roadmap into the official FreeRTOS distribution – the LTS roadmap page gives an insight into what will follow. In recognition of this […]

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  • Decrease RAM Footprint and Accelerate Execution with FreeRTOS Notifications

    Introduction Queues and semaphores are textbook features provided by all operating systems. Developers new to FreeRTOS use them because they are familiar with them. In most use cases, though, FreeRTOS direct-to-task notifications provide a smaller and up to 45% faster alternative to semaphores, and FreeRTOS message buffers and stream buffers provide a smaller and faster […]

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  • FreeRTOS Kernel v10.4.0 is now available

    FreeRTOS kernel v10.4.0 is now available for download. The new version brings numerous new features such as improved direct to task notifications functionality, enhancements to kernel ports that support memory protection units (MPUs), and a new Linux port. See the change history for additional details. Direct to Task Notification Enhancements Prior to FreeRTOS V10.4.0, each […]

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