What WITTENSTEIN high integrity systems does

WITTENSTEIN high integrity systems Ltd (WHIS) is a UK-based, privately held subsidiary of the German WITTENSTEIN Group, founded in 2003 and headquartered in Bristol/Long Ashton with 51–100 employees. The company specializes in safety-certified embedded real-time operating system (RTOS) and middleware software for mission-critical applications in automotive, aerospace, medical, and industrial markets. Its flagship product, SAFERTOS, is a highly deterministic, pre-certified safety RTOS—built on a two-layer architecture comprising a common SAFE RTOS core (~80% of code) and a portable processor/compiler layer—independently certified by TÜV SÜD to IEC 61508 SIL 3 (since 2007) and ISO 26262 ASIL D. Each variant is delivered with a comprehensive Design Assurance Pack (DAP) containing full lifecycle documentation, HAZOPS reports, source code, verification evidence, and test harnesses to accelerate customer certification.

The product portfolio extends beyond SAFERTOS to include the SAFERTOS Enhanced Security Module for security-critical environments, a streamlined SAFERTOS CORE variant, the SAFE Checkpoints runtime verification monitor, TCP/IP networking and IoT middleware, and OPENRTOS (a commercial license of Amazon FreeRTOS delivered under WHIS's AWS Advanced Technology Partner relationship). Supporting tools include Tracealyzer integration (Percepio), Stateviewer (Lauterbach/Eclipse), and Windows/Linux simulators. WHIS's heritage is rooted in FreeRTOS—Richard Barry created FreeRTOS while employed at WHIS in 2003—and the company continues to monetize professional FreeRTOS services (porting, training, licensing, IoT components) while offering a migration path to the certified SAFERTOS.

WHIS operates a one-time, perpetual, royalty-free licensing model with 12 months of included support, selling per-processor/compiler/configuration variant. Revenue is supplemented by fee-for-service training, consultancy, and FreeRTOS professional services. Distribution combines direct enterprise sales (HQ +44 1275 395 600, Americas +1 408 625 4712) with an extensive ecosystem of silicon partners (AMD, Qualcomm, Renesas, Infineon, NXP, STMicroelectronics, Texas Instruments, Microchip, SiFive, Arm), tool partners (IAR, Lauterbach, LDRA, TASKING, PLS), and industry partners (AWS, NVIDIA, QNX, RISC-V, Quintauris, FreeRTOS). Over 95% of business is conducted overseas, recognized by the 2025 King's Award for Enterprise in International Trade.

Name

WITTENSTEIN high integrity systems

Legal name

WITTENSTEIN high integrity systems Ltd

Website

https://highintegritysystems.com

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

51–100 employees

Short description

WHIS provides pre-certified safety-critical RTOS (SAFERTOS) and middleware for embedded systems, serving automotive, aerospace, medical, and industrial OEMs and Tier 1 suppliers requiring IEC 61508 SIL 3 and ISO 26262 ASIL D functional safety compliance.

Ownership category

akta.pro rank

Product category

Safety-Critical Embedded Real-Time Operating Systems (RTOS)

NAICS

Custom Computer Programming Services (541511), Computer Systems Design and Related Services (54151)

SIC

Services-Computer Programming Services (7371), Services-Computer Integrated Systems Design (7373)

akta.pro primary industry

Embedded Software & Firmware Tools (Compilers, Debug, RTOS tooling) (HDAHAFAE)

akta.pro secondary industries

Safety Instrumented Systems & Machine Safety Control (SIS, Safety PLCs, Relays) (IMAGABAF), Verification IP (VIP) & Protocol Compliance Suites (HDAHAFAG)

Keywords

• Safety-critical RTOS
• Embedded real-time operating system
• Pre-certified safety software
• Functional safety middleware
• Automotive safety software

Headquarters

HQ city

Long Ashton

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Personnel, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Software Licensing (SAFE RTOS): Royalty-free, perpetual commercial licenses for SAFE RTOS, delivered as pre-built binary evaluation packages and full source code with DAP. Customers pay an upfront license fee with no ongoing royalties, and 12 months of support and maintenance included. Licensing is processor/compiler/configuration specific.
2. Software Licensing (OPENRTOS): Commercial license for Amazon FreeRTOS, including FreeRTOS kernel and additional software libraries, sold with professional licensing terms.
3. Professional Services (FreeRTOS): Porting, training, and IoT component services for FreeRTOS users, delivered as an AWS Advanced Technology Partner with professional support contracts.
4. Consultancy and Training: Fee-for-service training courses and consultancy engagements to help customers optimize designs, improve design processes, and achieve certification faster.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels6 records

Core offering

WITTENSTEIN high integrity systems sells safety-critical embedded real-time operating system (RTOS) software — primarily its pre-certified SAFERTOS family — along with related middleware, safety plugins, and professional services. SAFERTOS is independently certified by TÜV SÜD to IEC 61508 SIL 3 and ISO 26262 ASIL D and is supplied with a comprehensive Design Assurance Pack (DAP) covering full lifecycle documentation, HAZOPS, and verification evidence. The company also offers OPENRTOS (commercial FreeRTOS license), FreeRTOS porting/training/licensing services, TCP/IP and IoT middleware, and supporting development tools for embedded engineering teams in automotive, aerospace, medical, and industrial markets.

Product overview

WITTENSTEIN high integrity systems offers a portfolio of safety-critical embedded software products centered on its pre-certified SAFERTOS safety RTOS. The core offering is SAFERTOS, a highly deterministic real-time operating system pre-certified to IEC 61508 SIL 3 and ISO 26262 ASIL D, supplied with a comprehensive Design Assurance Pack. This core is augmented by the SAFERTOS Enhanced Security Module for security-critical applications, and the streamlined SAFERTOS CORE variant. The company also provides OPENRTOS for commercial FreeRTOS licensing as part of its AWS strategic alliance, plus Safety Plugins including SAFE Checkpoints for runtime verification. Supporting the RTOS products is middleware for TCP/IP networking and IoT connectivity, and development tools including Tracealyzer visualization, Stateviewer debugging plugins, and Windows/Linux simulators. Professional services encompass FreeRTOS porting, training, and licensing, with migration paths from FreeRTOS to SAFERTOS. The company maintains partnerships with major silicon vendors (AMD, Qualcomm, Renesas, STMicroelectronics, Infineon, NXP, Microchip, Texas Instruments, SiFive), development tool providers (IAR Systems, Lauterbach, LDRA, TASKING), and industry partners (Arm, NVIDIA, QNX, RISC-V, AWS) to ensure broad platform support and ecosystem integration.

Differentiator

Problem solved

Functional benefit

Products and services

• SAFERTOS Highly deterministic, pre-certified safety RTOS for embedded systems requiring certification to IEC 61508 SIL 3, ISO 26262 ASIL D, FDA 510(k), and IEC 62304. Sold as royalty-free, perpetual commercial licenses built and verified for specific processor, compiler, and configuration combinations, supplied with a comprehensive Design Assurance Pack. Targeted at automotive, aerospace, medical, and industrial OEMs and Tier 1 suppliers.
• SAFERTOS Enhanced Security Module Security enhancement add-on for SAFERTOS that reinforces and strengthens the existing security of the RTOS for highest security-critical environments, including automotive embedded cybersecurity applications.
• OPENRTOS Commercial license for Amazon FreeRTOS, providing professional licensing terms around the FreeRTOS kernel and additional software libraries. Distributed via the AWS ecosystem as part of WHIS's strategic business alliance with Amazon Web Services.
• SAFERTOS CORE Streamlined variant of SAFERTOS providing core safety RTOS functionality with pre-certified safety pedigree, targeted at applications with more limited requirements.
• Safety Plugins (SAFE Checkpoints) Optional safety-related plugins and extensions for SAFERTOS, including SAFE Checkpoints runtime verification monitor that detects, indicates, and handles systematic faults and supports ISO 26262 ASIL C/D runtime verification requirements.
• FreeRTOS Services Professional services for FreeRTOS including porting, training, licensing, and IoT components, delivered by WHIS as an AWS Advanced Technology Partner. Leverages WHIS's FreeRTOS heritage to support commercial licensing and developer migration paths.
• TCP/IP Networking Middleware IPv4 TCP/IP networking stack middleware integrated with SAFERTOS for embedded connectivity applications. Part of the WHIS middleware portfolio.
• IoT Middleware Internet of Things middleware components for embedded RTOS applications, enabling connectivity and data exchange for IoT deployments.
• Stateviewer Kernel-aware debugging plugin for SAFERTOS that provides visibility into RTOS internals during development and debugging. Available as an Eclipse plugin for Renesas e2studio IDE.
• Windows and Linux Simulator

Quantifiable outcome

• Using Wait For Interrupt instruction in the idle task of a Cortex-M processor can save over one-third of total energy consumed by the processor
• +1 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration25 records

Feature9 records

Partnerships

14 partnerships are on record, tiered significant, core and minor.

• ThunderXsignificantTechnology or Integration · 1 April 2026ThunderX adopted SAFERTOS for its next-generation AI domain controller platforms (AIBOX and RazorDCX Tarkine) powered by Qualcomm SoCs. The integration supports scalable deployment of intelligent driving and vehicle AI applications, enabling OEMs to meet stringent automotive safety standards and improve reliability of AI-enabled driving functions through real-time safety and compliance features.
• Tata TechnologiescoreStrategic or Co-development Partner · 2 March 2026Strategic partnership to integrate WHIS's SAFERTOS safety-critical embedded software into Tata Technologies' automotive SDV platform. The collaboration enables automotive OEMs and Tier 1 suppliers to meet ISO 26262 functional safety standards while accelerating development of connected, autonomous, and electrified vehicles. Both companies will work together globally to provide integrated engineering services, software validation, and deployment support for next-generation vehicles. No financial terms were disclosed.
• AMDcoreTechnology or IntegrationSilicon partner supporting SAFE RTOS on AMD Xilinx platforms including Microblaze, Zynq-7000, UltraScale MPSoC, Kria K26, and Versal AI Edge (VC1902, VE2802). WHIS demonstrated SAFERTOS running independently on both Arm Cortex-R5F and Cortex-A72 cores of the AMD Versal AI Edge Series VEK280 Evaluation Kit, enabling automotive developers to combine high-performance computing with deterministic real-time control on a single heterogeneous platform.
• QualcommsignificantTechnology or IntegrationSilicon partner supporting SAFE RTOS on Qualcomm Snapdragon/Qualcomm Snapdragon Ride platforms including ARM Fixed Virtual Platform (Simulator) based on Cortex-R52 for automotive SoC applications.
• RenesascoreTechnology or IntegrationPlatinum-level silicon partner. SAFE RTOS demo released for Renesas RH850U2A16 Starter Kit (4th generation RH850), offering automotive-grade hardware for testing safety-critical RTOS applications. Additional support for R-Car M3, R-Car H3, RX72N, and various RX600 family devices.
• InfineoncoreTechnology or IntegrationSilicon partner supporting SAFE RTOS on Infineon microcontrollers and microprocessors including XMC4000 family (Cortex-M4F), AURIX TC2x/TC3x/TC4xx/TC499 (TriCore), and Traveo/CYT2B98CAE (Arm Cortex).
• NXPcoreTechnology or IntegrationSilicon partner supporting SAFE RTOS across NXP's broad portfolio including S32K, S32V, S32G (vehicle networking), i.MX RT, i.MX6x, Kinetis, LPC5500, MPC55x/56x/57x, and RV32M1 (RISC-V) families.
• STMicroelectronicscoreTechnology or IntegrationST Partner Program member supporting SAFE RTOS on the extensive STM32 family including STM32H7 (dual-core M4+M7), STM32F7, STM32F4, STM32L4/L5/U5, STM32G4, STM32F0/F3, STM32WBA/WBx, and SPC5 series.
• Texas InstrumentscoreTechnology or IntegrationSilicon partner supporting SAFE RTOS on TI microcontrollers and processors including Hercules RM4x/TMS570LS (safety-critical automotive), Jacinto TDA4 (Cortex-R5F + DSP), Tiva/Cortex-M, TMS320 Delfino, and Concerto platforms.
• MicrochipsignificantTechnology or IntegrationSilicon partner supporting SAFE RTOS on Microchip dsPIC33A DSC families (dsPIC33AK128MC106, dsPIC33AK512MPS512), PIC32MZ/MX, MiV_RV32 (RISC-V), SmartFusion, and SmartFusion 2 devices.
• ArmsignificantTechnology or IntegrationIndustry partner with WHIS providing SAFE RTOS ports for multiple Arm architectures including Cortex-A, Cortex-R, Cortex-M, and Cortex-M33 (with TrustZone) variants across various silicon platforms.
• Amazon Web Services (AWS)coreGTM or Marketing PartnerAWS Advanced Technology Partner providing professional FreeRTOS licensing, porting, training, and IoT components as part of a strategic business alliance. WHIS continues to serve FreeRTOS users with commercial licensing and support after AWS assumed stewardship of FreeRTOS in 2017.
• FreeRTOScoreStrategic or Co-development PartnerWHIS has a joint history with FreeRTOS: Richard Barry created FreeRTOS while employed at WHIS in 2003. WHIS engineers worked closely with Richard to develop SAFE RTOS as a safety-critical upgrade. The migration path from FreeRTOS to SAFE RTOS is a core part of WHIS's commercial strategy, enabling the large FreeRTOS user base to transition to a certified solution.
• QuintaurisminorStrategic or Co-development PartnerPartnership with Quintauris for RISC-V, including participation in an automated RISC-V benchmarking platform referenced at embedded world events.

Scale indicators1 record

Recent moves6 records

Expansion highlights6 records

Direct peers

• Green Hills Software: Direct competitor in safety-critical RTOS, with INTEGRITY RTOS pre-certified to IEC 61508 SIL 3, ISO 26262 ASIL D, and DO-178C. Competes head-to-head with WHIS in automotive, aerospace, medical, and industrial safety markets and serves many of the same Tier-1 OEM customers.
• BlackBerry QNX: Direct competitor offering the QNX Neutrino RTOS, widely deployed in automotive instrument clusters, ADAS, and cockpit domain controllers with ASIL D certification. A key rival for WHIS in the automotive SDV and AI domain controller segments.
• Wind River Systems: Direct competitor with VxWorks, the long-standing market-leading safety-certified RTOS for aerospace, defense, automotive, and industrial. Competes with WHIS across nearly all of its served verticals, particularly in DO-178C and ISO 26262 programs.
• SYSGO: European-based direct competitor offering PikeOS, a safety- and security-certified RTOS and hypervisor certified to IEC 61508 SIL 3, ISO 26262 ASIL D, and DO-178C. Targets the same embedded safety-critical applications as WHIS, particularly in European automotive and rail.
• Lynx Software Technologies: Direct competitor with LynxOS-178 and the MOSA.ic framework for safety-critical and military/aerospace embedded systems. Competes with WHIS in DO-178C and IEC 61508 programs, particularly in defense and aerospace adjacencies.
• eSOL: Japanese-headquartered direct competitor with eT-Kernel and eMCOS safety-certified RTOS offerings targeting automotive ISO 26262 and industrial IEC 61508. Provides comparable pre-certified safety software with strong Japanese automotive OEM relationships.
• ENEA: Direct competitor with the OSE real-time operating system, historically strong in telecom and now expanding into automotive and industrial safety markets. Competes with WHIS for embedded safety deployments in industrial control and automotive ECUs.

Broad incumbents

• Siemens (Elektrobit / Mentor Embedded): Broad incumbent offering AUTOSAR stacks, hypervisors, and embedded software through its Siemens EDA and EB tresos product lines. Competes with WHIS in automotive safety software as part of a much larger portfolio, often displacing single-purpose RTOS vendors in platform-level deals.
• Vector Informatik: Broad incumbent in automotive embedded software, with AUTOSAR basic software, MICROSAR, and safety middleware. Competes with WHIS as a one-stop-shop for OEMs building ISO 26262-compliant vehicles, often absorbing the RTOS layer into its stack.

Emerging players

• FreeRTOS (AWS): Open-source RTOS stewarded by AWS since 2017, which WHIS supports commercially via OPENRTOS. While not a direct safety-certified competitor, FreeRTOS represents the upstream ecosystem from which SafeRTOS draws its migration funnel and constrains the addressable market for commercial licenses.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/WITTENSTEIN_HIS
• LinkedInlinkedin.com/company/wittenstein-high-integrity-systems

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about WITTENSTEIN high integrity systems