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License Details
[About FreeRTOS]

MIT Open Source License Text

Both the FreeRTOS kernel and Amazon FreeRTOS are provided under the following MIT open source license. The table below contains answers to common license questions.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software. If you wish to use  Amazon
FreeRTOS name, please do so in a fair use way that does not cause confusion.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


Optional (third party) 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.

License Comparison

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




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Latest News

FreeRTOS kernel V10 is available for immediate download. Now MIT licensed.


FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

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

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

OpenRTOS and SafeRTOS