# Heirloom Computing: Mainframe Application Modernization on Every Platform

> IBM Mainframe migration solution with 5X faster modernization to Java\. Delivers cloud\-native apps with no disruption and 65\-85% cost savings\.

Generated by Yoast SEO v27.7, this is an llms.txt file, meant for consumption by LLMs.

## Pages
- [Heirloom/X](https://heirloomcomputing.com/heirloom-x/)
- [Heirloom Computing](https://heirloomcomputing.com/)
- [Insights](https://heirloomcomputing.com/insights/)
- [Case Studies](https://heirloomcomputing.com/case-studies/)
- [About](https://heirloomcomputing.com/about/)

## Posts
- [ISG Mainframe Report 2026](https://heirloomcomputing.com/isg-mainframe-report-2026/): ISG has named Heirloom Computing the multi\-platform Global Leader for Mainframe Application Modernization Software in its 2026 Quadrant Report\. Our technology modernizes mainframe workloads to native Java applications deployable on every cloud platform—on\-premise, any cloud, or IBM Z\.
- [The Abstraction Tax](https://heirloomcomputing.com/abstraction-tax/): Every decade, mainframe modernization gets a new savior\. Rules extraction, lift and shift, model\-driven generation, and now behavioral observation\. The technology changes\. The failure mode doesn't\. Every abstraction between source and target silently destroys critical information, and no observation window can capture what it cannot see\.
- [LLMs and COBOL Modernization](https://heirloomcomputing.com/llms-and-cobol-modernization/): Anthropic, Thoughtworks, AWS, and a growing number of startups are positioning AI as the answer to mainframe modernization\. LLMs are genuinely transformative for parts of the journey — and structurally unsuited to the part that matters most\. Here's where deterministic transpilation and AI each belong\.
- [The CLOUD Act Problem: Why Mainframe Modernization Must Avoid Vendor Lock\-In \- Part 2](https://heirloomcomputing.com/cloud-act-2/): AWS's CLOUD Act defense inadvertently reveals they can access customer data when technically feasible\. Despite sovereignty agreements, 20,000\+ surveillance requests and academic research show "sovereign" clouds offer limited protection, making platform\-independent modernization essential for regulatory flexibility and business resilience\.
- [Accelerating Mainframe Modernization to Sovereign Clouds – Part 2](https://heirloomcomputing.com/sovereign-clouds-2/): European organizations need data sovereignty and mainframe modernization, but platform\-dependent solutions prevent migration to sovereign clouds\. Heirloom's proven mainframe application modernization technology enables rapid, low\-risk deployment to every platform including sovereign platforms like STACKIT, OVHcloud \& Tietoevry, achieving compliance and cost reduction\.

## Floating Elements
- [Home Page Banner](https://heirloomcomputing.com/e-floating-buttons/home-page-banner/)

## Portfolios
- [Arek Oy](https://heirloomcomputing.com/portfolio/arek-oy/)
- [Avon](https://heirloomcomputing.com/portfolio/avon/)
- [OCLC](https://heirloomcomputing.com/portfolio/oclc/)
- [Venerable](https://heirloomcomputing.com/portfolio/venerable/)
- [Vitec Autosystemer](https://heirloomcomputing.com/portfolio/vitec/)

## Categories
- [TECHNICAL](https://heirloomcomputing.com/category/technical/)
- [MIGRATION](https://heirloomcomputing.com/category/migration/)
- [CLOUD](https://heirloomcomputing.com/category/cloud/)
- [SEMIOTICS](https://heirloomcomputing.com/category/semiotics/)
- [SECURITY](https://heirloomcomputing.com/category/security/)

## Portfolio Categories
- [Case Study](https://heirloomcomputing.com/portfolio_category/case-study/)

## Optional
- [Sitemap index](https://heirloomcomputing.com/sitemap_index.xml)