A Small, Scalable Open Source RTOS for IoT Embedded Devices

The Zephyr™ Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with safety and security in mind.
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Complete flexibility & freedom of choice

Open source & neutral governance

Supports multiple hardware architectures

Scales from small cortex-m devices to multi core 64-bit CPUs

Connect small footprint IoT devices securely to any cloud

Multi protocol options including BLE mesh and thread

Supporting industrial, automotive, smart city and smart home

Cloud agnostic – Connect with transport layer security to any cloud

Develop products with safety built in

Long term support coming soon

In-depth security development lifecycle

Functional safety certification coming soon

What's New


Getting Started with Zephyr RTOS on Nordic nRF52832 hackaBLE

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Written by Mahesh Venkitachalam, Founder of Electronut Labs This blog post first ran on the Electronut Labs Website. To see more content from Mahesh Venkitachalam or to learn more about…

The Zephyr Project Grows IoT Ecosystem with Support for More Than 100 Developer Boards and New Members

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Six New Industry and Academic Members Join the Open Source group to Create a Secure and Safe IoT RTOS SAN FRANCISCO – August 9, 2018 – The Zephyr™ Project, an…


Apr 01

Linaro Connect

April 1, 2019 - April 5, 2019

Find out more about Zephyr Project

Videos, presentations, demos, and more

Read the project documentation

Pull Requests Closed

As of Release 1.13.0 (September 2018)

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