• Zephyr
  • A Small, Scalable, Open Source RTOS for IoT Embedded Devices

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What is Zephyr Project?

The Zephyr™ Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with security in mind. This Linux Foundation hosted project embraces open source development values and governance on its mission to unite leaders from across the industry to produce a best-in-breed solution.

At Its Core


  • Developed with security in mind.
  • Deliver security features for resource constrained devices

Open Source

  • Neutrally governed
  • Established and proven development model
  • Permissively licensed


  • Connectivity protocols optimized for resource constrained devices
  • Developers can customize for their device needs

What's New

September 22, 2017

Zephyr OS 1.9 Release

The frequent followers of Zephyr™ Project have probably picked it up already and are enjoying the new features of the latest Zephyr OS release. But in case you missed it: the Zephyr Project team has completed and released the Zephyr RTOS version 1.9, a next step towards our goal of best-in-breed, multi-architecture, small, scalable, secure RTOS optimized for the Internet of Things!
August 21, 2017

Announcing Bluetooth™ Mesh support in Zephyr™ Project

The Bluetooth Mesh specification was announced to the public in July 2017, and now, thanks to the contributions from Intel Corporation, the Zephyr project has an implementation of it. The code is available in the upstream master branch, and will be part of the Zephyr OS 1.9 release, due early September 2017.