description FreeRTOS Overview
FreeRTOS remains the dominant choice for many embedded developers due to its permissive MIT license, portability across a vast range of microcontrollers, and extensive community support. Its small footprint makes it ideal for resource-constrained devices. While it lacks some advanced features found in commercial RTOSs, its simplicity and flexibility allow for customization. The recent addition of the FreeRTOS+ kernel provides a more robust foundation for complex applications.
It's a solid starting point for many projects, especially where cost is a significant factor.
insights Why this score
FreeRTOS ranks #1 of 6 in the Real Time ranking, ahead of Zephyr.
balance FreeRTOS Pros & Cons
- Very low memory footprint
- Highly portable across hardware
- Permissive MIT open-source license
- Steep learning curve
- Lacks commercial technical support
help FreeRTOS FAQ
Is FreeRTOS free to use in commercial products?
Yes, FreeRTOS is distributed under the MIT license, which permits free commercial use without requiring source code disclosure. This permissive licensing is one reason it has become the dominant RTOS in the embedded industry.
Who owns and maintains FreeRTOS?
Amazon Web Services (AWS) acquired FreeRTOS in 2017 and continues to maintain it as an open-source project. The original creator, Richard Barry, remains involved, and AWS has extended the ecosystem with AWS FreeRTOS (now called FreeRTOS) for cloud-connected devices.
How does FreeRTOS compare to Zephyr RTOS?
FreeRTOS is lighter, simpler, and more widely adopted across the embedded industry, with a smaller learning curve. Zephyr, backed by the Linux Foundation, offers a more comprehensive feature set including a built-in networking stack, device tree support, and a driver model that appeals to more complex IoT applications.
What microcontrollers and architectures does FreeRTOS support?
FreeRTOS supports dozens of architectures including ARM Cortex-M (used in STM32, Nordic nRF, and NXP chips), ESP32 (Espressif), AVR, PIC32, RISC-V, and x86. Official kernel ports are maintained for the most common platforms, and community ports cover many others.
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