FreeRTOS is often chosen when developers want simplicity, stability, and small footprint. Zephyr is designed for scalable and connected embedded systems. Now a days Zephyr is the preferred RTOS for the IoT systems.
FreeRTOS
- Lightweight and widely used
- Simple kernel design
- Huge adoption in MCU-based systems
- Supported by many vendors (STM32, ESP32, NXP and so on)
Zephyr
- Modern RTOS backed by the Linux Foundation
- Modular architecture
- Built-in support for networking, Bluetooth, and security
- Strong integration with modern development tools
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