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Last site update June 02 2015

License Details
[About FreeRTOS]


The FreeRTOS open source license enables FreeRTOS to be used in commercial applications without any requirement to expose your proprietary source code. An alternative commercial license option is also available in cases that:
  • You cannot fulfill the requirements stated in the "FreeRTOS Open Source License" column of the table below.
  • You wish to receive direct technical support.
  • You wish to have assistance with your development.
  • You require legal protection or other assurances.

License feature comparison

Open Source License
Commercial License
Is it free?
Can I use it in a commercial application?
Is it royalty free?
Is a warranty provided?
Can I receive professional technical support on a commercial basis?
No, FreeRTOS is supported by an online community
Is legal protection provided?
Yes, IP infringement protection is provided
Do I have to open source my application code that makes use of the FreeRTOS services?
Do I have to open source my changes to the RTOS kernel?
Do I have to document that my product uses FreeRTOS?
Yes if you distribute source code
Do I have to offer to provide the FreeRTOS code to users of my application?
Yes if you distribute source code

Commercial Licensing

OpenRTOSTM is a commercially licensed version of FreeRTOS. The OpenRTOS license does not contain any references to the GPL.
SAFERTOSTM is a derivative version of FreeRTOS that has been analyzed, documented and tested to meet the stringent requirements of the IEC 61508 safety standard. Complete safety lifecycle documentation artifacts have been created and independently audited to verify IEC 61508 SIL 3 conformance.

The FreeRTOS Open Source License

The FreeRTOS source code is licensed by a modified GNU General Public License - the modification taking the form of an exception. The exception permits the source code of applications that use FreeRTOS and are distributed as executables to remain closed source, thus permitting the use of FreeRTOS in commercial applications without necessitating that the whole application be open sourced. The exception can only be used if you wish to combine FreeRTOS with a proprietary product, and you comply with the terms stated in the exception itself.

The full text of the FreeRTOS Open Source License, which applies to FreeRTOS V8.2.3 up to the current version, is available here. License information for FreeRTOS+ Ecosystem products is provided separately.

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Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2015 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News - New Book Edition!

Receive a complimentary pre-release pdf of our up-coming book "Mastering the FreeRTOS Real Time Kernel, a Hands-On Tutorial Guide" with every purchased copy of the existing "Using the FreeRTOS Real Time Kernel" book.

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FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Xilinx Microblaze and Zynq partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists