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PX5 RTOS
What it is
PX5 RTOS is a hard real-time operating system for embedded applications with limited resources, using a native POSIX pthreads API. It is presented for demanding safety-critical work in areas including automotive, industrial, medical and rail systems. The maker says a minimal configuration on typical 32-bit microcontrollers can use as little as 1KB of flash and 1KB of RAM; at 80MHz, most API calls and context switches complete in less than one microsecond. Processing is described as predictable and independent of the number of active threads. Stated certifications include IEC 61508 SIL 4, IEC 62304 Class C, ISO 26262 ASIL D and EN 50128 SW-SIL 4. Runtime verification covers function pointers, system objects, buffers and stacks. Supported architectures include Arm Cortex-M, Cortex-R and Cortex-A, RISC-V, Renesas RX, AMD MicroBlaze and Infineon TriCore. Listed tools include IAR, Eclipse/GCC, Arm DS and Arm Keil. Integrations or examples include TensorFlow Lite Micro, Microsoft Azure, Amazon AWS, lwIP, Mbed TLS, NetX Duo and OpenAMP. Pricing is on request; listed licensing starts at $5,000 as a one-time fee or $5,000 a year. Free evaluation kits require a free PX5 Community login.
For and against
For
- Native POSIX pthreads API.
- Minimal configuration can use 1KB flash and 1KB RAM.
- Listed certifications cover safety-critical standards.
- Free evaluation kits are available with a PX5 Community login.
Against
- Pricing is on request.
- Listed licensing starts at $5,000.
- Evaluation kits require a free PX5 Community login.
The verdict
PX5 RTOS is aimed at resource-constrained embedded work requiring predictable real-time processing. Its licensing starts at $5,000, so teams should confirm pricing and platform fit with the maker.
Who it suits
PX5 RTOS suits developers of resource-constrained embedded systems, particularly in safety-critical automotive, industrial, medical or rail settings. Its listed processor and developer-tool support can help teams check compatibility with their platform.
Plans and prices
Device/Product Licensing
Perpetual license · Full source code · No royalties · Professional support
Read 4 Oct 2026 · px5rtos.com
Enterprise, SoC, Semiconductor, and Custom Licensing
Perpetual license · Full source code · No royalties · Professional support
Read 4 Oct 2026 · px5rtos.com
Subscription Licensing
Full source code · No royalties · Professional support
Read 4 Oct 2026 · px5rtos.com
On the record
- Determinism
- The maker says API and context-switch processing is predictable and does not depend on the number of active threads.px5rtos.com · read 4 Oct 2026
- Developer tools
- The maker lists support for IAR, Eclipse/GCC, Arm DS, and Arm Keil tools.px5rtos.com · read 4 Oct 2026
- Evaluation downloads
- Free evaluation kits are available for processors and platforms from AMD Xilinx, GigaDevice, Infineon, Microchip, NXP, Renesas, SiFive, Silicon Labs, STMicroelectronics, and Texas Instruments; a free PX5 Community login is required.px5rtos.com · read 4 Oct 2026
- Footprint
- The maker says minimal use can require as little as 1KB of flash and 1KB of RAM on typical 32-bit microcontrollers.px5rtos.com · read 4 Oct 2026
- Hardware support
- Listed processor architectures include Arm Cortex-M, Cortex-R and Cortex-A, RISC-V, Renesas RX, AMD MicroBlaze, and Infineon TriCore.px5rtos.com · read 4 Oct 2026
- Integrations
- The integration page lists TensorFlow Lite Micro, Microsoft Azure, Amazon AWS, lwIP, Mbed TLS, NetX Duo, and OpenAMP integrations or examples.px5rtos.com · read 4 Oct 2026
- Intended users
- The maker presents PX5 RTOS for safety-critical automotive, industrial, medical, rail, and other demanding embedded applications.px5rtos.com · read 4 Oct 2026
- Performance
- On typical 32-bit microcontrollers running at 80MHz, most API calls and context switches complete in less than one microsecond.px5rtos.com · read 4 Oct 2026
- Purpose
- PX5 RTOS is a hard real-time operating system for resource-constrained embedded applications, with a native POSIX pthreads API.px5rtos.com · read 4 Oct 2026
- Safety certifications
- PX5 RTOS is stated to be certified to IEC 61508 SIL 4, IEC 62304 Class C, ISO 26262 ASIL D, and EN 50128 SW-SIL 4.px5rtos.com · read 4 Oct 2026
- Security
- The RTOS includes pointer/data verification technology for run-time function pointer, system object, buffer, and stack verification.px5rtos.com · read 4 Oct 2026
- Security support
- The support team says it proactively notifies customers about newly identified CVEs and provides exposure guidance and known workarounds when a resolution is unavailable.px5rtos.com · read 4 Oct 2026
- Support
- The published support SLA lists response times under one working day for critical and serious issues, and under two working days for moderate and cosmetic issues.px5rtos.com · read 4 Oct 2026
- Testing
- The maker says it tests the entire RTOS code base with complete C statement and branch decision coverage for every release.px5rtos.com · read 4 Oct 2026