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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

  • New FreeRTOS Long Term Support version released

    It has been another 18 months since we introduced our last FreeRTOS Long Term Support (FreeRTOS 202210 LTS). With FreeRTOS LTS, developers can rely on a FreeRTOS version that provides feature stability, security patches and critical bug fixes for two years from the release date. We released the first LTS version (FreeRTOS 202012 LTS) with […]

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  • Introducing FreeRTOS Kernel version 11.0.0: A Major Release with Symmetric Multiprocessing (SMP) Support

    FreeRTOS Kernel version 11.0.0 is now available for download. This release includes the following features: While FreeRTOS introduced Asymmetric Multiprocessing (AMP) support in 2017, FreeRTOS version 11.0.0 is the first to merge Symmetric Multiprocessing (SMP) support into the mainline release. SMP enables one instance of the FreeRTOS Kernel to schedule tasks across multiple identical processor […]

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  • Simplifying Authenticated Cloud Connectivity for Any Device

    Introduction Featured FreeRTOS IoT reference integrations show how to integrate the Long-Term Support (LTS) versions of FreeRTOS libraries with hardware enforced security to help create secure cloud connected devices. This blog describes how to use Wi-Fi and Cellular connectivity modules that implement the AWS IoT ExpressLink specification (from here on, "ExpressLink") to achieve the same […]

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  • Designing an energy efficient and cloud-connected IoT solution with CoAP

    Two of the main factors considered during the development of Internet of Things (IoT) devices are efficiency and cloud compatibility. Efficiency, both in energy consumption and data usage, is important to reduce operational and maintenance costs - especially for cellular, battery-operated devices. Energy saving is a puzzle with many pieces, and choosing the appropriate communication […]

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