FreeRTOS
FreeRTOS: A free, open-source RTOS with broad architecture support and optional networking. Ranked #8 of 14 in IoT Operating Systems by our editors (7.9/10); pricing: Free plan; best for free RTOS for microcontrollers and small processors.
At a glance
- Editor score7.9 / 10
- PricingFree plan
- Best forFree RTOS for microcontrollers and small processors
- Free planYes
- Paid fromFree
- Facts checked23 Sep 2026
Where it wins
- Free and MIT-licensed for embedded projects
- Supports 40+ processor architectures, including RISC-V and ARMv8-M
- LTS libraries provide two years of security and critical bug fixes
Where it doesn't
- Focused on embedded physical devices rather than cloud images
- Requires self-hosted deployment and device-specific integration work
- Dedicated commercial support and licensing come through a strategic partner
Our verdict on FreeRTOS
FreeRTOS is an embedded real-time operating system for microcontrollers and small microprocessors. Its kernel and libraries target firmware teams that need deterministic task scheduling, communication between tasks and interrupts, synchronization primitives, timers, and configurable memory allocation. The project is free and open source under the MIT license, making it suitable for small, mid-market, and enterprise organizations building embedded physical devices.
The platform’s breadth comes from its architecture and tooling coverage. Vendor documentation lists support for more than 40 processor architectures, including RISC-V and ARMv8-M, along with kernel ports, demos, reference integrations, and more than 15 toolchains. Core capabilities include queues, semaphores, mutexes, event groups, software timers, and optional symmetric multiprocessing. Optional TCP/IP networking adds IPv6 support, allowing teams to extend the operating system for connected embedded designs while retaining control over which libraries are included.
Lifecycle support is a notable consideration for products that need maintained embedded components: long-term-support libraries receive security updates and critical bug fixes for two years. FreeRTOS is deployed by teams managing their own embedded hardware and integration process, so it fits organizations with firmware and toolchain responsibilities rather than buyers seeking a hosted operating system service. Commercial licensing and dedicated support are available through WITTENSTEIN high integrity systems. Choose FreeRTOS when a free, configurable RTOS with broad processor coverage matches your device program; consider another option if you need cloud-oriented deployment, built-in AI features, or support delivered directly as part of the core project.
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FreeRTOS pricing
FreeRTOS fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Deployment model | Not verified |
| Supported device OS | Not verified |
| Over-the-air updates | Not verified |
| Fleet provisioning | Not verified |
| Protocol support | Not verified |
| Certificate management | Not verified |
| Device limit | Not verified |
| Deployment | Self-hosted |
| Support | Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | freertos.org |
| Facts checked | 23 Sep 2026 |
Alternatives to FreeRTOS
- VxWorksA broad, deterministic RTOS for teams building safety-critical embedded products.9.3
- QNX Neutrino RTOSA mature commercial RTOS for mission-critical embedded products and multicore targets.9.1
- Apache NuttXA free, configurable RTOS with broad documented hardware support and POSIX-oriented APIs.9.0
See all FreeRTOS alternatives →
FreeRTOS vs the competition
- FreeRTOS vs VxWorks
- FreeRTOS vs QNX Neutrino RTOS
- FreeRTOS vs Apache NuttX
- FreeRTOS vs Micrium OS
- FreeRTOS vs Apache Mynewt
- FreeRTOS vs TencentOS Tiny
Compare FreeRTOS with any tool side by side →
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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