Chrome extension that audits SEO metadata on any webpage with instant scoring, structured data validation, and AI-friendly copyable reports for Claude Code and Cursor.
I built this because every existing SEO auditor is a cloud dashboard that wants an account and a paid plan. SEO Lens runs in the browser — open any page, click the extension, get a score out of 100 with categorized findings. Every finding is copyable as structured plain text, ready to paste into Claude Code or Cursor.
The audit engine is a separate seo-rules Effect-TS package — runtime-agnostic so the same rules can run in the extension, a CLI, or an MCP server later. A background service worker fetches the raw HTML (matching what crawlers see), not the JS-rendered DOM.
Free, open source, Manifest V3. Install from the Chrome Web Store or see the full project breakdown.