NuttX

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Apache NuttX
Modern vector logo of Apache NuttX RTOS
Developer	Apache Software Foundation
Written in	C, C++, assembly
OS family	POSIX
Working state	Current
Source model	Open source
Initial release	2007; 19 years ago (2007)
Latest release	12.13.0 / April 2, 2026; 59 days ago (2026-04-02) [1]
Repository	github.com/apache/nuttx
Marketing target	Embedded systems
Supported platforms	ARM, AVR, AVR32, HCS12, LM32, MIPS, RISC-V, OpenRISC, SuperH, Xtensa, x86, x86-64, Z80
Kernel type	Real-time monolithic kernel
License	Apache License 2.0
Official website	nuttx.apache.org

Apache NuttX is a free and open-source real-time operating system (RTOS) with an emphasis on technical standards compliance and on having a small footprint. It is scalable from 8-bit to 64-bit microcontroller environments.^[2][3] The main governing standards in NuttX are from the Portable Operating System Interface (POSIX) and the American National Standards Institute (ANSI)^[4]. Further standard application programming interfaces (APIs) from Unix and other common RTOSes (such as VxWorks) are adopted for functions unavailable under these standards,^{[citation needed]} or inappropriate for deeply embedded environments, such as the fork() system call.^{[citation needed]}

NuttX was initially released in 2007 under the permissive BSD license.^[5] In December 2019, it began incubation at the Apache Software Foundation.^[6]; its license was changed from the BSD license to the Apache License and it graduated to a top-level project in November 2022.^[7]

• PX4 autopilot drones.^[8]
• Samsung TizenRT based on NuttX RTOS.^[9][10]
• Xiaomi Vela, an IoT software platform based on NuttX.^[11][12]

• Official website