FreeRTOS 202104.00 is now available for download, including new managed OTA and MQTT agent libraries. See the What's New Post for more information!
 

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.

Features

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 202104.00 includes new managed OTA and MQTT capabilities for IoT applications

    FreeRTOS version 202104.00 includes managed AWS IoT Over-the-Air update (OTA) and coreMQTT Agent libraries, and the AWS IoT Device Defender custom metrics feature. Developers can use these libraries to remotely update IoT device firmware, manage IoT device fleets, and monitor IoT device fleet metrics. These libraries have been optimized for modularity and memory usage for […]

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  • Why Write Another MQTT Library?

    Libraries capture a set of decisions about how the world should work. If you're lucky, the model in the library is a suitable match for your needs and constraints. If you're not lucky, you either end up with something that's wasteful, or requires changes, or you must search for a different library that's a better […]

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  • FreeRTOS Long Term Support now includes AWS IoT over-the-air update, AWS IoT Device Defender, and AWS IoT Jobs libraries

    FreeRTOS Long Term Support (LTS) release 202012.01 now includes the over-the-air update (OTA), AWS IoT Device Defender, and AWS IoT Jobs libraries in the first LTS release (FreeRTOS 202012.00 LTS). With this release, developers can use the FreeRTOS LTS libraries to update firmware, manage device fleets, and monitor fleet metrics for their microcontroller-based IoT devices. […]

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  • Why SESIP™ Certification for FreeRTOS Matters

    FreeRTOS is now certified for the Security Evaluation Standard for IoT Platforms (SESIP™) Assurance Level 2. FreeRTOS is software that, in most cases, runs on embedded system processors. More than ever, developers are building FreeRTOS applications while participating in a growing community that has been working together for more than 18 years. Although the primary […]

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