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Apache NuttX

NuttX is a free and open-source (FOSS) real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOS's (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).

Get NuttX

Release packages are available for download. We use three primary GIT repositories to develop the project: RTOS, Applications, and Website. Documentation is part of the RTOS repository and then built and hosted online.

Documentation

Full project documentation can be found here. Security documentation is here. NuttX related articles and scientific papers are here.

Online Demo

NuttX is incredibly portable. It runs on over 15 different CPU architectures, over 300 popular embedded hardware boards and development kits, provides more than 1500 ready to use firmware configuration templates for your project. See yourself, try out the NuttX WebAssembly demo.

Community Events

International Workshop 2025

The Apache NuttX International Workshop is organized every year. You can attend online or in person for free. This year we meet on 16-17th October 2025 in Costa Rica. We hope to meet with Gregory Nutt on site. See you there!

Please visit events website for more details. You can join the event at LinkedIn. Call For Papers is now open!

The scope of the workshop is the Apache Nuttx® Real Time Operating System, the tools used for its design, development, deployment, debugging, and maintenance, the applications that use it, and the hardware on which it typically runs. The target audience is embedded systems practitioners across both industry and academia.

Key Features

A real-time operating system designed for embedded systems

15+ CPU Architectures

Runs on ARM, RISC-V, x86, Xtensa, and more. Supports multiple CPU architectures and hardware platforms.

300+ Hardware Boards

Extensive board support from popular development kits to custom hardware.

1500+ Configuration Templates

Pre-configured builds for rapid prototyping and production deployment.

Open Community

Developed and maintained by an active open-source community.

Documentation

Complete guides, security information, and research papers

Full Documentation

Complete API reference, user guides, and developer documentation for Apache NuttX RTOS.

Security Documentation

Security guidelines, best practices, and vulnerability reporting information.

Scientific Papers & Articles

Research papers, technical articles, and publications about Apache NuttX.

Technical Structure

Access source code, releases, and project repositories

Release packages are available for download. We use three primary GIT repositories to develop the project: RTOS, Applications, and Website. Documentation is part of the RTOS repository and then built and hosted online.

Release Packages

Download official Apache NuttX releases with verified signatures and checksums.

RTOS Repository

Core RTOS code, kernel, drivers, and documentation sources.

Applications Repository

Sample applications, examples, and utilities for NuttX.

Website Repository

Source code for the Apache NuttX project website.

Video Tutorials

Step-by-step video guides and workshops on YouTube.

Code Examples

Browse hundreds of sample applications and code examples.

Try NuttX Shell

Experience NuttX POSIX-compliant shell environment. Click to launch the interactive WebAssembly demo.

NuttShell (NSH)

NuttShell (NSH) NuttX-12.4.0
nsh> █

Launch Interactive Demo

Join the Apache NuttX Community

NuttX is developed and maintained by an international group of volunteers from all around the world. We welcome developers of all skill levels to contribute to the project. View our full contributor list on GitHub.