Ship better legacy code, every commit.
The code quality platform for the legacy languages modern tools forgot — Delphi, Free Pascal and VB6. Static analysis in CI, baselines so builds fail only on new findings, debt trends per commit and release, and a report that shows how far your Delphi code is from a clean migration.
Three languages, one quality pipeline
Scan a mixed repository in a single run — findings share the same dashboard, baselines, quality score and PR comments regardless of language.
Delphi & Object Pascal
145 rulesFrom Delphi 7 to current: with-blocks, try/finally leaks, the Unicode and Win64 traps that bite during upgrades, deprecated units, and security checks built for Pascal idioms.
Free Pascal & Lazarus
Same engine
The Object Pascal engine understands FPC dialect directives and Lazarus
projects, so .pas, .pp and .lpr files
get the full rule set with dialect-aware analysis.
Visual Basic 6
47 rules
On Error Resume Next, implicit Variants, SQL concatenation, error-handler
fall-through, unclosed recordsets — plus the maintainability layer that makes
the quality score and debt trend meaningful for .bas,
.cls and .frm files.
Why LegacyLint?
Legacy codebases deserve modern tooling. LegacyLint understands Object Pascal and VB6 idioms — the with-blocks, the On Error Resume Next, the implicit Variants — and catches the patterns generic linters miss.
Track progression, not just problems
Quality trends, deltas between scans, regression detection. See what changed since last scan and track improvement over time.
Comments on every pull request
Inline annotations and a summary comment on your GitHub and Azure DevOps pull requests — right where you review. Set quality budgets and fail the build on error-severity findings.
Security-aware analysis
Detect hardcoded credentials, SQL concatenation, command injection, insecure protocols, and format string vulnerabilities.
Findings where you review them
LegacyLint annotates each finding on the exact line of your pull request, adds a summary comment, and can fail the build on error-severity issues — on GitHub and Azure DevOps.
Rules built for legacy languages
190+ rules across Object Pascal (Delphi and Free Pascal) and VB6, each targeting real failure modes in the codebases that actually run businesses.
Long methods, god classes, deep nesting, too many parameters, magic numbers
Hardcoded credentials, SQL injection, command execution, insecure protocols, format strings
Empty except blocks, create without try/finally, exit without result, absolute variables
String concatenation in loops, FindComponent in loops, expensive lookups
Class/interface naming conventions, boolean comparisons, nil checks, deprecated patterns
AnsiString usage, Variant types, goto, with statements, deprecated units, global state
Up and running in minutes
Three steps to start tracking code quality — for Delphi, Free Pascal and VB6 alike.
Install the CLI
Single binary, no dependencies. Download for Windows or Linux.
Scan your code
Point it at your source directory. Results in JSON or SARIF format.
Track & enforce
Upload results to the dashboard. Set quality budgets. Fail CI on regressions.
Works with your stack
GitHub Actions
Azure DevOps
SARIF
JSON Export
Simple, transparent pricing
Start free for 14 days. No credit card required.