RT-Thread

RT-Thread
Developer	Bernard Xiong & RT-Thread Team
Written in	C
Working state	Current
Source model	Open source
Initial release	2006 (2006)
Latest release	5.2.1 / May 30, 2025 (2025-05-30)
Repository	github.com/RT-Thread/rt-thread
Marketing target	Embedded systems, IoT
Supported platforms	ARM (Cortex-M0, -M3, -M4, -M7, -M23, -R4, -A8, -A9; ARM7, ARM9, ARM11), MIPS32, RISC-V, ARC, TMS320 DSP, C-Sky, x86
Kernel type	Monolithic
License	Apache 2.0
Official website	www.rt-thread.io

RT-Thread is an open-source real-time operating system (RTOS) for embedded systems and Internet of things (IoT). It is developed by the RT-Thread Development Team based in China. RT-Thread is aimed to change the current situation in China that there is no well used open-source real-time operating system in the microcontroller field.

As of August 2020, RT-Thread was reported to be #3 on the list of RTOSes with the largest number of contributors (behind Zephyr and Mbed).

Variants

In 2006, RT-Thread began as an open-source real-time operating system (RTOS) that is mainly written in the programming language C. In 2017, a second variant was released for resource-constrained microcontrollers; it needs a minimum of 3 kB flash memory or read-only memory (ROM) and 1.2 kB random-access memory (RAM). Also, RT-Thread's first variant was named Standard, and second variant was named Nano.

See also

• Embedded system
• Microcontroller
• Single-board microcontroller

External links

• Official website
• RT-Thread on GitHub
• gitee repository