AI-powered mainframe modernization

Finally understand
your COBOL codebase

LegacyLens automatically parses, maps, and documents your COBOL and JCL programs. Dependency graphs, AI-generated docs, and plain-English explanations — no mainframe expertise required.

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ACCTPRC01.cbl — dependency graph

Source

IDENTIFICATION DIVISION.
PROGRAM-ID. ACCTPRC01.

ENVIRONMENT DIVISION.

DATA DIVISION.
  COPY ACCTBAL.
  COPY CUSTMSTR.

PROCEDURE DIVISION.
  CALL 'CALCLATR'
  CALL 'AUDITREC'

AI Analysis

Purpose

Account processing orchestrator. Handles balance calculation and audit trail recording for customer accounts.

Copybooks (2)

ACCTBAL, CUSTMSTR

Calls (2)

CALCLATR → AUDITREC

COBOL

& JCL support

100%

automated parsing

generated docs

Zero

mainframe expertise needed

Everything you need to tame legacy code

From raw COBOL source to interactive dependency maps and plain-English documentation.

COBOL & JCL Parsing

Deep parsing of COBOL programs and JCL job streams. Handles copybooks, nested CALL chains, PERFORM hierarchies, and file definitions.

Dependency Graphs

Interactive maps of every program, copybook, and job relationship. Understand blast radius before making changes.

AI Documentation

Auto-generated, plain-English documentation for every program. Ask questions about your codebase in natural language.

Resource Inventory

Complete catalogue of files, datasets, programs, and their types across your entire mainframe estate.

GitHub Integration

Connect your source repositories via GitHub webhooks. Re-index automatically on every push — always up to date.

Analytics & Stats

Metrics on program complexity, dead code detection, most-called modules, and modernization readiness scores.

Up and running in minutes

No agents to install. No mainframe connectivity required.

Upload your source

Drag and drop a ZIP of your COBOL and JCL source files, or connect a GitHub repository. LegacyLens handles EBCDIC-to-UTF-8 conversion automatically.

Automatic analysis

LegacyLens parses every program, maps copybook relationships, traces CALL chains, and identifies data flows — all in the background.

Explore & document

Browse interactive dependency graphs, read AI-generated documentation, and ask plain-English questions about what your programs actually do.

Built for teams dealing with legacy code

🏦

Banks & Financial Institutions

Decades of undocumented COBOL powering core systems. LegacyLens makes it legible before a critical outage — or a modernization project — forces the issue.

🔄

Modernization Teams

Know exactly what you're rewriting before you start. Dependency graphs and complexity metrics let you prioritize and de-risk migrations to Java, Python, or cloud services.

👩‍💻

New-to-Mainframe Developers

Onboarding to a 40-year-old codebase? AI documentation and plain-English explanations get you productive without years of COBOL experience.

Ready to see your codebase clearly?

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Finally understand your COBOL codebase