Capabilities
One extension.
Replaces six.
WCAG-First Scanning
axe-core plus 73 custom heuristic rules covering gaps like aria-hidden visibility conflicts, overflow clipping, label-in-name mismatches, autoplay media, and more. Results mapped to WCAG, not cryptic rule IDs.
Browse all rules →Guided Manual Review
53 WCAG criteria that can't be automated presented as a checklist with Pass/Fail/N/A toggles. Filtered by page relevance.
Visual Overlays
Toggle violation highlights, numbered tab order badges, and focus gap outlines directly on the page. Movie mode animates through tab order in real time.
Multi-Viewport Scanning
Scan at mobile, tablet, and desktop widths in one click. Catch responsive-only issues like overlapping buttons and hidden content.
Depth-First Site Crawl
Crawl an entire site page by page with backtracking. Pause to interact with the page, resume when ready. Skips nofollow links. Handles auth and redirects.
Observer Mode
Auto-scan every page you visit and build a local history of accessibility results over time. Combine with Site Crawl for full-site coverage — all data stays local.
AI-Ready Reports
Export to PDF, HTML, or JSON with WCAG mappings and fix suggestions. Optionally enrich JSON with DOM context, CSS styles, framework hints, and file path guesses for AI agent workflows.
Why this exists
Compliance deadlines
are approaching.
The DOJ ADA Title II rule mandates WCAG 2.1 AA for all state and local government digital content. The EU Accessibility Act took effect June 2025. Enterprise audit tools cost $15K–$250K/year. Free tools are fragmented across 4–5 separate extensions.
A11y Scan combines automated scanning, guided manual review, visual overlays, and exportable reports in a single free extension.
How it works
Three steps.
No accounts.
Install the extension
Load the extension from GitHub. No Chrome Web Store account or payment required. One click to add.
Choose scan mode and start
Pick a mode — Site Crawl for multi-page audits, or just a standard scan. Check Multi-Viewport for responsive testing. Controls adapt to your selection. Results appear in seconds, grouped by WCAG criterion.
Review, overlay, export
Toggle violation overlays on the page. Walk the manual review checklist. Export JSON for AI agents, HTML for sharing, or PDF for stakeholders.
Under the hood
Built on proven open-source foundations.
A11y Scan is in beta
The core scanning engine, manual review, ARIA validation, visual overlays, site crawl, and report export are all functional and actively used. We are refining the experience — improving accuracy, adding features, and polishing the UI based on real-world usage.
Start scanning today.
Free. No sign-up. No data collection.
Just install and scan.