Heirloom Computing

What Heirloom Computing does

Heirloom Computing, founded in 2010 by former Micro Focus executive Gary Crook, is a privately held enterprise software company that modernizes IBM mainframe applications for Global 2000 customers. Its core product is a deterministic transpiler (compiler) that converts COBOL and PL/I source code into cloud-native Java with guaranteed byte-for-byte functional equivalence, rather than relying on probabilistic AI approaches. The platform handles the full mainframe subsystem stack (CICS, JCL, Db2, VSAM, IMS, RACF) and deploys output to any cloud (AWS, Oracle, Google Cloud, Azure), sovereign clouds (STACKIT, OVHcloud), on-premise infrastructure, or back to IBM Z, eliminating vendor lock-in. A complementary module, Heirloom/X, layers agentic AI with local LLMs trained on company IP to refactor transpiled Java into idiomatic Java over time, and Probe provides automated functional-equivalence testing.

Heirloom generates revenue through a combination of software licensing (recurring) and professional services delivered alongside global system integrators including Accenture, Capgemini, Cognizant, and CGI. The company also holds the AWS Mainframe Modernization ISV Competency and pursues joint go-to-market with AWS, Oracle, and Google Cloud. Headcount is 11-50 employees, dual-headquartered in Alamo, California and Dublin, Ireland, with active engagements across North America, Latin America, and Europe (USA, Ireland, Brazil, Finland, Norway). Customers include PHEAA, Riocard IT, Arek Oy, ACI Worldwide, Venerable, Vitec Autosystemer, Avon, and OCLC, spanning financial services, government, transportation, manufacturing, education, and retail.

The company is recognized as the highest-ranked independent modernization software vendor in ISG's 2026 Mainframe Application Modernization Software quadrant across U.S., U.S. public sector, and Europe, and has been named a CIO Review IBM Mainframe Migration Solution Company of the Year (2025) and a CEO Monthly Cloud Migration CEO of the Year (2024, Gary Crook). Its business model is enterprise project-based with subscription software elements, targeting mainframe-dependent incumbents facing rising maintenance costs, a shrinking COBOL/PL/I talent pool, and pressure to decommission legacy estates.

Name

Heirloom Computing

Legal name

Heirloom Computing, Inc.

Website

https://heirloomcomputing.com

Company type

Private

Founded year

2010

Operating status

Operating

Headcount range

11–50 employees

Short description

Heirloom Computing is a privately held enterprise software company founded in 2010 that transpiles IBM mainframe COBOL and PL/I applications into cloud-native Java for Global 2000 enterprises, serving financial services, government, manufacturing, education, and transportation customers through direct sales and a GSI channel.

Ownership category

akta.pro rank

Product category

Mainframe Modernization Software

NAICS

Computer Systems Design and Related Services (5415)

SIC

Services-Prepackaged Software (7372), Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

Hybrid Cloud Migration, Modernization & Integration (HDABAMAH)

akta.pro secondary industries

Cloud Application Modernization & Refactoring (BPAEACAC), Private Cloud Platforms (On‑Prem Cloud Stacks) (HDABABAA)

Keywords

• Mainframe modernization
• COBOL to Java migration
• Deterministic transpiler software
• Cloud-native application replatforming
• Legacy application refactoring

Headquarters

HQ city

San Francisco

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, Infrastructure

Revenue model

1. Software Licensing: The company licenses its mainframe modernization software platform to enterprise customers for mainframe application transformation projects. Revenue is generated through software licenses for the deterministic transpiler technology, Heirloom/X refactoring tools, and associated runtime components.
2. Professional Services: Implementation services delivered alongside partner ecosystem (Accenture, Capgemini, Cognizant, CGI) for complex mainframe migration projects. Services include assessment, migration execution, testing, and deployment support.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels6 records

Core offering

Heirloom Computing provides a deterministic transpiler platform that converts IBM mainframe COBOL and PL/I applications into cloud-native Java with guaranteed functional equivalence. The platform simultaneously delivers replatforming and refactoring outcomes, with Heirloom/X adding AI-driven progression to idiomatic Java and Probe providing automated equivalence testing. Customers can deploy migrated Java workloads on-premise, on any major cloud (AWS, Oracle, Google Cloud, Azure), sovereign clouds, or IBM Z with no vendor lock-in.

Product overview

Heirloom Computing offers a unified platform for IBM mainframe modernization consisting of the core Heirloom transpiler product and the Heirloom/X AI-powered refactoring module. The core Heirloom platform uses deterministic compilation to simultaneously deliver replatforming (transpiling COBOL and PL/I to Java for immediate cloud migration) and refactoring outcomes, giving customers unprecedented control over their transformation pace. The Heirloom/X module adds generative AI and autonomous agents to progressively modernize transpiled Java code into idiomatic Java. Probe provides automated testing to ensure functional equivalence validation. Together, these products enable enterprises to migrate from legacy mainframe stacks (COBOL, CICS, JCL, DB2, VSAM) to modern Java applications deployable on any cloud, on-premise, or IBM Z infrastructure.

Differentiator

Problem solved

Functional benefit

Products and services

• Heirloom

Quantifiable outcome

• 60-85% operational cost reduction (OpEx)
• +7 more outcomes

Named customers8 records

Segments6 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability6 records

Feature6 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• AccenturecoreImplementation/ SI/ Consulting PartnerAccenture is a key implementation partner for Heirloom mainframe modernization projects. Accenture and Heirloom worked together on the Arek Oy pension system modernization, where Accenture provided implementation services alongside Heirloom's technology.
• AWScoreTechnology or IntegrationAWS-certified Mainframe Modernization ISV Competency partner. Heirloom's platform runs natively on AWS infrastructure including EC2, ECS, EKS, Beanstalk, Fargate, App Runner, and Lambda. AWS has featured Heirloom in their Partner Network case studies (Venerable, Arek Oy) and blog content.
• CapgeminicoreImplementation/ SI/ Consulting PartnerCapgemini is a global system integrator partner for Heirloom mainframe modernization engagements. Partner logo appears in the About page partner section.
• CGIcoreImplementation/ SI/ Consulting PartnerCGI is a global IT consulting and systems integration firm that partners with Heirloom for mainframe modernization delivery. Partner logo appears in the About page partner section.
• CognizantcoreImplementation/ SI/ Consulting PartnerCognizant is an implementation partner for Heirloom projects. Cognizant teams worked with Heirloom on Venerable and Avon mainframe migrations, providing delivery expertise alongside Heirloom's technology.
• Google CloudcoreTechnology or IntegrationGoogle Cloud is a cloud platform partner for Heirloom migrations. The Arek Oy pension system was migrated to Google Anthos (Google's managed Kubernetes). Google features this case study in their cloud customer stories.
• HexawareminorImplementation/ SI/ Consulting PartnerHexaware is a global IT consulting firm that partners with Heirloom for mainframe modernization delivery. Partner logo appears in the About page partner section.
• OraclecoreTechnology or IntegrationOracle is a cloud infrastructure partner. Riocard IT's migration to Oracle Cloud Infrastructure was featured at Oracle AI World as a showcase implementation - the world's first IBM mainframe migration to Oracle Cloud. Oracle provided cloud infrastructure while Heirloom provided the modernization technology.
• TietoevrycoreImplementation/ SI/ Consulting PartnerTietoevry was an implementation partner alongside Accenture and Heirloom for the Arek Oy pension system modernization in Finland. Nordic IT services provider with local expertise.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Modern Systems: Modern Systems provides automated COBOL/RPG modernization and is now part of Capgemini Engineering. It competes with Heirloom on mainframe-to-modern transformations for large enterprises, particularly in financial services and industrial verticals.
• CloudFrame: CloudFrame specializes in converting legacy COBOL and mainframe applications to modern Java-based stacks. It is a niche direct competitor targeting the same COBOL-to-Java modernization use case that Heirloom addresses with its deterministic transpiler.
• Astadia: Astadia is a mainframe and midrange modernization specialist acquired by Accenture in 2023. It offers tooling and services for COBOL/PL/I migration and competes directly with Heirloom on Global 2000 modernization deals, increasingly as part of Accenture's broader transformation portfolio.
• OpenText (Micro Focus): OpenText acquired Micro Focus in 2022, gaining Visual COBOL, COBOL development tools, and server modernization IP. Micro Focus is the most established incumbent in COBOL-to-modern tooling and competes head-to-head with Heirloom in mainframe application modernization for Global 2000 enterprises.
• Skytap: Skytap provides a cloud platform purpose-built for lifting legacy and mainframe workloads into AWS or Azure environments. It addresses the same hybrid-cloud modernization buyer as Heirloom, with an emphasis on rehosting versus Heirloom's transpile-to-Java approach.
• TmaxSoft: TmaxSoft offers OpenFrame, a rehosting/replatforming solution that migrates mainframe workloads to Linux/x86 environments. It competes directly with Heirloom in converting legacy mainframe applications to run on modern infrastructure, particularly across Asian and European enterprise markets.
• mLogica: mLogica offers mainframe migration services and tooling under the MAINFRAME2CLOUD brand and was recognized by ISG as a CX Star Performer in mainframe modernization. It directly competes with Heirloom in COBOL/PL/I replatforming engagements for mid-to-large enterprises.

Broad incumbents

• IBM: IBM owns the IBM Z mainframe platform and offers Watsonx Code Assistant for Z and related modernization tooling. As the incumbent mainframe vendor, IBM competes with Heirloom both by promoting stay-on-IBM-Z migrations and through AI-assisted modernization paths.
• AWS Mainframe Modernization Service: AWS offers a managed mainframe modernization service with both replatforming and refactoring paths on its own cloud infrastructure. As a hyperscaler incumbent with bundled cloud economics, it competes with Heirloom for the same AWS-bound enterprise mainframe workloads.
• Infosys: Infosys operates a large mainframe modernization practice and has its own tooling and reference architectures for COBOL/PL/I migration. As a top-tier global SI with packaged modernization offerings, it competes with Heirloom on enterprise modernization deals and on partner-led delivery engagements.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/heirloomcomputing
• Xx.com/heirloomcc

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Funding overview

Funding rounds1 record

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 Heirloom Computing