lo-eyes

Visual frontend accessibility inspector MCP server. WCAG contrast checking, touch target validation, heading hierarchy audits, responsive screenshots, and S+ grading across mobile and desktop viewports.

Built by Like One Foundation (501(c)(3) nonprofit). Works with any site by changing BASE_URL.

Tools

Tool	Description
eyes_screenshot	Viewport-sized screenshot at any device preset
eyes_scan	Auto-chunk full page into readable viewport pieces with RAG manifest
eyes_audit	Responsive + accessibility audit with S+ grading
eyes_devices	List available device presets

Device Presets

Name	Viewport	Type
iphone-se	375x667	Mobile
iphone-14	390x844	Mobile
ipad	768x1024	Tablet
laptop	1280x800	Desktop
desktop	1440x900	Desktop

Audit Checks

• Overflow: Elements exceeding viewport width (respects scroll parents)
• Font size: Text below 12px minimum
• Touch targets: Interactive elements below Apple HIG 44px minimum
• Heading hierarchy: Skipped heading levels (h1 -> h3)

Grading

Grade	Criteria
S+	Zero issues
A	1-5 medium, zero high
B	6+ medium, zero high
C	1-2 high
D	3-5 high
F	6+ high

Setup

cd lo-eyes
python3 -m venv .venv
source .venv/bin/activate
pip install playwright mcp
python3 -m playwright install chromium

Usage

As MCP Server (Claude Code)

Add to .mcp.json:

{
  "mcpServers": {
    "lo-eyes": {
      "command": "/path/to/lo-eyes/.venv/bin/python3",
      "args": ["/path/to/lo-eyes/server.py"]
    }
  }
}

As CLI

./lo-eyes audit /                           # Audit homepage
./lo-eyes screenshot /blog/ --device ipad   # iPad screenshot
./lo-eyes scan / --device iphone-14         # Full-page chunked scan
./lo-eyes responsive /academy/              # All 5 viewports

Stack

• Python 3
• Playwright (headless Chromium)
• MCP SDK (FastMCP, stdio transport)

License

MIT

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