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. 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 202107.00 now includes the SNTP library for time information in IoT applications

    FreeRTOS 202107.00 now includes the Simple Network Time Protocol (SNTP) client library to make it easier for developers to add support for time information in their FreeRTOS-based IoT applications. The SNTP client library, named coreSNTP, is used to synchronize clocks between a device and the cloud. You can use coreSNTP in IoT applications where devices […]

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  • FreeRTOS AWS reference integrations now include FreeRTOS 202012.01 LTS libraries

    FreeRTOS AWS reference integrations are pre-integrated FreeRTOS projects ported to microcontroller-based evaluation boards that demonstrate end-to-end connectivity to AWS IoT Core. This helps developers save months of development effort and accelerate time to market. FreeRTOS AWS reference integrations now include the new managed AWS IoT Over-the-Air (OTA) update library, AWS IoT Jobs library, the AWS […]

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  • Secure OTA Updates for Cortex-M Devices with FreeRTOS

    IoT devices are getting rapid adoption in every market segment and becoming a major target for cyberattacks. A significant proportion of attacks on IoT devices happens due to a lack of software updates once commissioned in the field or updates done insecurely. Cyber attackers often target vulnerabilities in outdated software components to take control of […]

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  • Introducing the FreeRTOS Symmetric Multiprocessing (SMP) Github Branch

    With processes shrinking and approaching the limits of physics, in the last decade we have all got used to multicore chips of increasing complexity and performance extending Moore’s law in our desktops and laptops. In embedded control, where cost, size and robustness demands often take precedence over performance, it seems the time for multicore has […]

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