Fujitsu Application Transform for Legacy Systems

97%: That’s how much Fujitsu Application Transform powered by Fujitsu Kozuchi cuts the time required to generate design documents for legacy systems.1

Why legacy modernization can't wait in 2026

Modernization is urgent because legacy systems still run core operations in finance, healthcare, and public services.2 Generating accurate documentation has been a bottleneck, but with a 97% reduction in time, Fujitsu’s service is shifting the economics and expectations of legacy transformation.1 Fast, accurate documentation is now the expectation, not the exception.

Fujitsu Application Transform is redefining legacy system analysis

Fujitsu Application Transform powered by Fujitsu Kozuchi automates the generation of design documents for legacy code—especially COBOL—with a 97% reduction in time compared to conventional methods.1 This means what used to take days now takes minutes. Most people get this wrong: automation here is not about replacing experts, but about freeing them from grunt work so they can focus on real transformation.

The service analyzes legacy source code directly, producing documents that are 95% more comprehensive and 60% more readable than traditional approaches.1 The actionable takeaway: documentation ceases to be a painful, manual ordeal. The human role shifts from deciphering spaghetti code to steering modernization strategy.

The power behind the productivity: Fujitsu Kozuchi and generative AI

The data shows that Fujitsu’s proprietary Kozuchi AI platform is the engine driving these results.1 By combining Kozuchi with the Takane Large Language Model co-developed with Cohere Inc., and integrating Anthropic's Claude, Fujitsu Application Transform moves beyond simple code analysis. It delivers design documentation that is both accurate and context-aware—without expert intervention for every codebase nuance.2

This is not fluffy AI hype. The result is that organizations can attack modernization projects with confidence, knowing the grunt work is handled at machine speed while keeping humans in the loop for judgment calls. Here’s the thing nobody tells you: vendor lock-in is a real debate, since this power comes from Fujitsu’s proprietary stack.1

Document quality: Comprehensiveness and readability hit new highs

Most people get this wrong: speed isn’t enough. Poor documentation quality kills modernization before it starts. Fujitsu Application Transform improves comprehensiveness by 95% over conventional methods, ensuring a more nuanced understanding of legacy systems.1 Readability jumps by 60%—the difference between decipherable and dense technical jargon is now measurable.

This enhancement is more than academic. Better documents mean fewer failed handoffs, less time wasted in meetings, and fewer errors when rewriting or rehosting applications. The takeaway: invest in documentation quality, not just automation, if you want real progress.

Industry application: Finance, public services, healthcare lead adoption

Finance, public services, and healthcare are the sectors where legacy systems are most entrenched and risk-averse.2 Fujitsu Application Transform is designed to meet their needs, especially for COBOL-heavy mainframes where documentation gaps and brain drain are existential threats.

For these organizations, the service’s ability to generate accurate, readable documents in minutes translates into faster compliance, less risk, and a real shot at cloud migration. The actionable insight: you don’t need to be first, but you do need to move before your talent retires and your core systems become unmaintainable.

"We see this announcement as an initiative that realistically advances the modernization of our legacy systems by combining Fujitsu’s deep system development expertise built up over many years with generative AI." — Toshihiro Horiuchi, Managing Executive Officer, SMBC Nikko Securities Inc.1

Cloud modernization: The AWS partnership and the next wave

The data shows that Fujitsu and Amazon Web Services have teamed up to accelerate legacy application modernization on the cloud.3 This partnership targets not just assessment and migration, but also the broader modernization of mission-critical systems—think AWS Mainframe Modernization, but now with Fujitsu’s AI muscle behind it.

This is what actually works. Not the fluffy advice you see everywhere. The actionable takeaway is that cloud migration is no longer a leap of faith; it’s a calculated, supported process with AI-driven insights and automation underpinning every step.

Fujitsu's global ambitions: From Japan to the United States and beyond

Most people get this wrong: rollout is not global—yet. Fujitsu Application Transform launched in Japan in March 2026 and global expansion, including the United States, is planned but not yet realized.1 Organizations in other regions need to plan for availability in their local markets and assess the readiness of their teams for when the service arrives.

The future roadmap includes features for rebuilding and rewriting source code, and supporting ongoing operation and maintenance, starting in fiscal year 2026.1 The actionable step: keep modernization strategies flexible so you can adopt these enhancements as soon as they land in your region.

Comparing leading modernization solutions (2026)

FAQ: Fujitsu Application Transform for Legacy Systems (2026)

The real impact: Modernization is finally catching up with reality

Legacy modernization was always a slow-motion crisis waiting for a spark. Fujitsu Application Transform powered by Fujitsu Kozuchi looks like that spark, at least in Japan for now. The numbers—97% time reduction, 95% improved document quality—are not just impressive; they’re a sign that the old rules of modernization are breaking down. The world isn’t short of AI talk. But in this case, it’s the measured results that matter. If your organization is still treating documentation as an afterthought or waiting for a mythical “fully automated” solution, you’re already behind. This is the year modernization gets real—or gets left behind.