Four engines, one result model
Normalize axe-core, Siteimprove Alfa, IBM Equal Access, and HTML_CodeSniffer into EARL outcomes and Success Criterion tags.
WCAG audit scanner
Multi-engine accessibility scans that survive real crawls.
a11y-catscan crawls HTML pages with Playwright and runs axe-core, Siteimprove Alfa, IBM Equal Access, and HTML_CodeSniffer into streaming reports.
Playwright
Rendered HTML
axe
Alfa
IBM
HTMLCS
Streaming output
JSONL + HTML + Markdown
Built for long scans
Stream JSONL per page, flush final reports incrementally, save crawl state, and resume after interruption.
Useful after the scan
Search reports, check individual pages, group findings, generate LLM summaries, and diff against a baseline.
Documentation
Run it, tune it, and explain the results.
Getting started
Install dependencies, run a first scan, and read the generated reports.
OpenConfiguration
YAML settings, CLI overrides, engines, WCAG levels, URL filters, and output naming.
OpenScan workflows
Full crawls, single-page checks, URL lists, rescans, diffs, grouping, and resume.
OpenAuthentication
Login plugins, saved storage state, session recovery, and logout-trap handling.
OpenReports
JSONL, JSON, HTML, Markdown summaries, allowlists, and interpreting findings.
OpenTroubleshooting
Missing engines, browser launch failures, auth loops, robots.txt skips, and noisy reports.
Open