Download FreeRTOS

Quality RTOS & Embedded Software

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

  • Achieving Unbrickable MCU FOTA for your FreeRTOS-powered Firmware: The Microvisor IoT Approach

    FreeRTOS brings a stack of functionality to embedded applications, enabling them to become much more flexible, and their developers to be more creative. But there's a key requirement of Internet of Things (IoT) applications in particular that takes a lot of extra development work to put in place, to make it truly secure, and to […]

    Read more…
  • FreeRTOS 202012 LTS end of support

    It has been six months since we announced the second release of FreeRTOS Long Term Support (LTS) - FreeRTOS 202210 LTS. Today the support period ends for the previous LTS release, FreeRTOS 202012 LTS. You can migrate your project to FreeRTOS 202210.01 LTS if you are using the previous version. See the migration guide and […]

    Read more…
  • FreeRTOS website now available in Simplified Chinese

    Over the years, more and more FreeRTOS users, including customers and partners, have been visiting the FreeRTOS website ( from the Greater China region. We are excited to announce Simplified Chinese language support for the FreeRTOS website, enabling customers from the Greater China region to easily search and browse content in their preferred language. With […]

    Read more…
  • New FreeRTOS Long Term Support version released

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

    Read more…
Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.