In-depth architectural comparison of the A11ymcp and MCP Accessibility Scanner MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.
At a Glance & Executive Verdict
A11ymcp
Browser Automation · Local stdio
Quality: 52/100 (Good) | Auth: No auth required
MCP Accessibility Scanner
Browser Automation · Local stdio
Quality: 61/100 (Good) | Auth: No auth required
Verdict Summary: Choose A11ymcp if you need specialized Browser Automation tools running via a local process. Choose MCP Accessibility Scanner if your workspace requires Browser Automation integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.
Which MCP Server Should You Choose?
Choose A11ymcp when:
You need dedicated capabilities in the Browser Automation domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
Primary tools included: Accessibility testing of URLs and HTML strings, Supports WCAG 2.0, 2.1, and 2.2 compliance levels, Customizable viewport dimensions for testing.
Web accessibility testing MCP server that analyzes URLs and HTML for WCAG 2.0/2.1/2.2 compliance using axe-core. Tools for color contrast, ARIA validation, and orientation lock detection.
MCP server for automated web accessibility scanning with Playwright and Axe-core.
A11ymcp is categorized under Browser Automation and uses a local stdio subprocess. In contrast, MCP Accessibility Scanner belongs to Browser Automation using local stdio subprocess. Select A11ymcp when you need capabilities focused on browser automation and MCP Accessibility Scanner when you require tools for browser automation.
Performs a comprehensive accessibility scan on the current page using Axe-core.
audit_site
Crawls and scans multiple internal pages, then aggregates violations across the site.
scan_page_matrix
Runs Axe scans on the same page across viewport/media/zoom variants and compares deltas against baseline.
audit_keyboard
Audits real keyboard focus behavior by pressing Tab (and optional Shift+Tab) with practical heuristics.
audit_screen_reader
Audits what a screen reader actually announces, using the browser's own accessibility tree (`page.ariaSnapshot`) plus element geometry. No screen reader is installed or driven; this is a static reading of the exposed tree.
browser_navigate
Navigate to a URL.
browser_navigate_back
Go back to the previous page.
browser_navigation_timeout
Set default navigation timeout for existing tabs.
browser_default_timeout
Set default operation timeout for existing tabs.
browser_snapshot
Capture accessibility snapshot of the current page (better than screenshot for analysis).
browser_find
Search the current page accessibility snapshot without returning the full snapshot.