Heirloom Computing
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.
- Company typePrivate
- Founded2010
- HeadquartersSan Francisco, United States
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
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.
Heirloom Computing firmographics
Firmographics- 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
Heirloom Computing industry classification
Industry- 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
Where Heirloom Computing is headquartered
LocationHeadquarters
- HQ city
- San Francisco
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Heirloom Computing business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure
Revenue model
- 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.
- 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
Heirloom Computing product offering
Product offeringCore 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
Companies that use Heirloom Computing
Customer profileNamed customers8 records
Segments6 records
Ideal customer profiles3 records
Heirloom Computing technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
AI capability6 records
Feature6 records
Heirloom Computing partnerships and signals
Strategic signalPartnerships
Nine partnerships are on record, tiered core and minor.
- AccenturecoreAccenture 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.
- AWScoreAWS-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.
- CapgeminicoreCapgemini is a global system integrator partner for Heirloom mainframe modernization engagements. Partner logo appears in the About page partner section.
- CGIcoreCGI 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.
- CognizantcoreCognizant 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 CloudcoreGoogle 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.
- HexawareminorHexaware is a global IT consulting firm that partners with Heirloom for mainframe modernization delivery. Partner logo appears in the About page partner section.
- OraclecoreOracle 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.
- TietoevrycoreTietoevry 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
Heirloom Computing competitors and assessment
Company assessmentDirect 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
Heirloom Computing social profiles
Digital presenceHeirloom Computing financial estimates
Financial estimateRevenue estimate
Valuation estimate
Heirloom Computing leadership team
Management profileNumber of profiles
Profiles9 records
Heirloom Computing funding detail
Funding detailFunding overview
Funding rounds1 record
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Heirloom Computing M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Heirloom Computing
What does Heirloom Computing do?
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.
Is Heirloom Computing a public or private company?
Heirloom Computing is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Heirloom Computing founded?
Heirloom Computing was founded in 2010. It employs 11 to 50 people.
Where is Heirloom Computing based?
Heirloom Computing is headquartered in San Francisco, United States, in the North America region.
How does Heirloom Computing make money?
Two revenue lines are on record. Software Licensing is the primary driver. The others are professional Services.
Who are Heirloom Computing's main competitors?
Direct peers on record are Modern Systems, CloudFrame, Astadia, OpenText (Micro Focus), Skytap, TmaxSoft and mLogica. Broad incumbents are IBM, AWS Mainframe Modernization Service and Infosys.
Does Heirloom Computing have an API?
No public API is recorded for Heirloom Computing.
What industry is Heirloom Computing in?
Heirloom Computing's product category is Mainframe Modernization Software. Its primary akta.pro industry code is HDABAMAH, Hybrid Cloud Migration, Modernization & Integration, with a secondary code of BPAEACAC, Cloud Application Modernization & Refactoring. Its NAICS code is 5415 and its SIC code is 7372.