DSI International

What DSI International does

DSI International, Inc. is a privately-held California corporation founded in 1985 that develops and sells model-based diagnostic engineering software for the design, simulation, deployment, and sustainment of complex and safety-critical systems. Its core platform, eXpress, is a model-based diagnostics engineering application that supports Integrated Systems Diagnostics Design (ISDD), Prognostics & Health Management (PHM), Testability Analysis, FMECA, FTA, and system safety analysis, using proprietary techniques such as Passive-Active Flow Modeling and Test Overlay Modeling. The product portfolio extends beyond eXpress to include the ISDD Tool Suite, STAGE diagnostic simulation, the Run-Time Authoring Tool, DSI Workbench for maintenance troubleshooting, a suite of diagnostic reasoners (Embedded, Dynamic, Workbench API), and modules for FMECA Plus, FTA, eXpressML, Prognostics, Maintenance, and ATML/PDEL test results integration. The company monetizes through a mix of one-time software licenses, recurring maintenance subscriptions (eXpress Spectrum Maintenance), formal/on-site/online training, custom interface development, and engineering support services, marketed through a direct enterprise sales motion supported by 7 offices globally.

The company's customers are concentrated in the defense and aerospace sectors and include US and European defense primes such as Boeing, Lockheed Martin, Raytheon, Northrop Grumman, BAE Systems, General Atomics, Sikorsky, General Dynamics, NAVAIR, Airbus, Thales, MBDA, and Nexter, with select adjacent logos in transportation (GE Transportation), technology (HP), and industrial/aerospace (Mitsubishi). Pain points addressed include reducing No Fault Found (NFF), Could Not Duplicate (CND), and Retest OK (RTOK) events, lowering false alarms and system aborts, improving Mean Time Between Critical Failures (MTBCF), reducing Mean Time to Isolate (MTTI), and integrating diagnostic data with Model-Based Systems Engineering (MBSE) digital threads via the DiagML open XML standard and IEEE / ATML interoperability. DSI International is privately held with no disclosed funding rounds, no M&A activity, no published revenue figures, and no headcount data; the company maintains an active website, recurring training schedule, newsletter (Spring 2026, Volume 32), and an annual user conference (EUG26).

Name

DSI International

Legal name

DSI International, Inc.

Website

https://dsiintl.com

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

11–50 employees

Short description

DSI International is a privately-held US software company, founded 1985, that sells model-based diagnostic engineering tools (eXpress platform, ISDD Tool Suite, STAGE, DSI Workbench) to defense, aerospace, and complex-systems primes for design, testability analysis, FMECA, and run-time troubleshooting.

Ownership category

akta.pro rank

Product category

Diagnostic Engineering Software

NAICS

Computer Systems Design and Related Services (5415), Custom Computer Programming Services (541511)

SIC

Services-Prepackaged Software (7372), Services-Engineering Services (8711), Services-Computer Programming Services (7371)

akta.pro primary industry

Industrial Automation Software (SCADA, HMI, MES, Historian) (IMAHAHAJ)

Keywords

• Diagnostic engineering software
• Model-based diagnostics
• Testability analysis tools
• FMECA software platform
• Prognostics health management

Headquarters

HQ city

Orange

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

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

Revenue model

1. Software Licenses: Sale of software tools including eXpress, STAGE, ISDD Tool Suite, DSI Workbench, Run-Time Authoring Tool, and ancillary tools. Likely one-time license or subscription model for enterprise software.
2. Maintenance and Support Services: Software maintenance plans including updates, enhancements and various levels of support including Spectrum Maintenance (20 hrs + Updates) and Time Block Consulting options.
3. Training Services: Formal, On-Site, or Online training courses including eXpress 100 Series Training and specialized courses like Modular Digital Threads using eXpressML & DiagML.
4. Engineering Support Services: Expert engineering support for diagnostic design, testability and critical fault analysis, including modeling, analysis and software support.
5. Custom Software Development: Custom Interface Development in support of diagnostic engineering endeavors.
6. Diagnostic Proposal Support: Assistance in proposal development for the design and/or analysis of diagnostics and prognostics.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels8 records

Core offering

DSI International develops and sells model-based diagnostic engineering software (centered on its eXpress platform) that enables defense, aerospace, and complex-systems customers to design, simulate, integrate, evaluate, deploy, and maintain diagnostics and prognostics for critical systems. The company complements its software with maintenance/support subscriptions, formal training courses, and professional engineering services including custom interface development and proposal support.

Product overview

DSI International offers a comprehensive portfolio of model-based diagnostic engineering software tools centered around its flagship eXpress platform. The core offering consists of the eXpress diagnostics engineering application, supplemented by the ISDD Tool Suite for integrated system diagnostic design, STAGE for diagnostic simulation, Run-Time Authoring Tool for publishing diagnostics to troubleshooting environments, and DSI Workbench for deployment in maintenance settings. The product architecture includes multiple specialized modules including FMECA Plus, Fault Tree Analysis, Prognostics Module, Maintenance Module, eXpressML Module, ATML/PDEL Test Results Modules, and a suite of diagnostic reasoners (Embedded, Dynamic, and Workbench API). Ancillary tools include the eXpress Design Viewer and Redline Module. The portfolio is designed for aerospace, defense, and complex systems industries, supporting the full diagnostic engineering lifecycle from design influence through run-time troubleshooting.

Differentiator

Problem solved

Functional benefit

Products and services

• eXpress Comprehensive model-based diagnostics engineering software application providing an environment for the design, capture, integration, evaluation and optimization of complex or large-scale system diagnostics, prognostics health management (PHM), systems testability engineering, FMECA and system safety analysis. Sold to defense, aerospace, and complex systems engineering organizations.
• ISDD Tool Suite Integrated System Diagnostic Design tool suite providing a comprehensive start-to-finish solution for meeting all diagnostic needs of system design, enabling influence on diagnostic development for new designs and exploitation of diagnostic challenges in legacy systems.
• STAGE (Diagnostic Simulation) Simulates aspects of Diagnostic, PHM and ISHM Engineering, showing the support capabilities of a System during its useful lifetime. Supports Testability, System Reliability & Mission Success, Sustainability, and Logistics Resource Allocations analysis.
• Run-Time Authoring Tool Solution for publishing eXpress diagnostic design data and integrating and deploying system diagnostic and prognostic designs within real-world troubleshooting environments.
• DSI Workbench Allows deployment of eXpress or user-supplied diagnostics within production and maintenance troubleshooting environments.
• DSI Training Courses Paid formal, on-site, and online training courses covering eXpress, DiagML, eXpressML, and diagnostic engineering workflows, delivered to enterprise customers and engineers.
• Maintenance & Time-Block Consulting Support Tiered software maintenance and consulting support services providing updates, enhancements, and blocks of engineering consulting hours at discounted rates for enterprise customers.
• Custom Engineering & Proposal Support Services Professional engineering services including custom interface development, diagnostic design and testability analysis support, modeling and analysis support, software support, and assistance in proposal development for diagnostic and prognostic programs.

Quantifiable outcome

• Reduces or eliminates NFF (No Fault Found), CND (Could Not Duplicate), and RTOK (Retest OK) events
• +4 more outcomes

Named customers16 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature9 records

Partnerships

Two partnerships are on record, tiered core.

• MBSE Tool PartnerscoreTechnology or IntegrationDSI eXpress integrates with popular MBSE (Model-Based Systems Engineering) tools to support sustainment-engaged 'Digital Thread' solutions. The company has performed real-time collaborative demonstrations of robust digital threads shared by industry partners using IEEE Standard data structures.
• IEEE Standards EcosystemcoreTechnology or IntegrationDSI supports IEEE Standard data structures for diagnostic data interoperability. DiagML (Diagnostic Markup Language) is based on open XML standards. The platform supports ATML (Automated Test Markup Language) for test and diagnostic tool integration.

Scale indicators4 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Isograph: Isograph offers fault tree analysis, reliability, and maintainability software widely used in aerospace, defense, and nuclear industries. Its IAM (Integrated Availability Management) and FaultTree+ products directly compete with DSI's FTA Module and FMECA Plus capabilities.
• ReliaSoft (part of Hottinger Brüel & Kjær / HBK): ReliaSoft provides reliability, maintainability, and RAMS software (Weibull++, ALTA, Xfmea) used by aerospace and defense engineering teams. It directly overlaps with DSI's FMECA Plus, FTA, and reliability engineering modules and serves the same reliability engineering buyer.
• Item Software (now Bentley Systems): Item Software's ITEM ToolKit is a well-established FMECA/FTA platform for aerospace and defense. After Bentley's acquisition, it competes inside a much broader asset and infrastructure platform—directly overlapping with DSI's core reliability engineering capabilities.

Broad incumbents

• Dassault Systèmes (3DEXPERIENCE): Dassault Systèmes provides the 3DEXPERIENCE platform with Model-Based Systems Engineering, reliability, and safety modules for aerospace and defense. It is a broad incumbent MBSE platform into which DSI's eXpress integrates rather than directly competes.
• Siemens Digital Industries Software (Teamcenter): Siemens Teamcenter is a leading PLM/MBSE platform with reliability and diagnostics-adjacent functionality. As a broad incumbent, it competes with DSI at the systems engineering layer where MBSE consolidates reliability analysis functionality.
• PTC (Windchill + Creo): PTC's Windchill and Creo platforms serve aerospace and defense with PLM, requirements, and reliability features. As a broad incumbent, PTC competes for the same systems engineering budget that drives DSI deployments.
• GE Digital (Predix / APM): GE Digital's asset performance management (APM) and Predix analytics platform competes in adjacent reliability and prognostics territory. As a broad industrial incumbent, it overlaps with DSI's prognostics and PHM capabilities for complex systems.
• Honeywell Forge (Honeywell Connected Enterprise): Honeywell Forge provides aerospace predictive maintenance and health monitoring analytics. As a broad incumbent with deep aerospace customer relationships, it competes with DSI's PHM and run-time diagnostic deployment value proposition.

Emerging players

• ALD (Applied Logistics & Design): ALD provides diagnostic and prognostic engineering services and tools to defense and aerospace programs. As a smaller emerging specialist, it competes with DSI's engineering support services and ISDD methodology offering.
• SLD Software (now PTC): SLD Software provided reliability and safety analysis tools (HAZOP, FTA) for aerospace and defense. Now part of PTC, it competes with DSI's FMECA Plus and FTA modules within a larger platform offering.

Market position

Strengths1 record

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/DSI_Intl
• YouTubeyoutube.com/user/DSIInternational?feature=mhee
• Facebookfacebook.com/dsiintl
• LinkedInlinkedin.com/company/dsi-international-inc-

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 DSI International