A free Chrome extension for anyone who builds or checks websites. Measure any element and the gap between two, edit CSS live, and test phone, tablet and desktop side by side. The new Audit tab lists what's wrong with the page, worst first: contrast, missing labels, slow images, typos, security headers, trackers before consent, broken links and SEO, each pointing at the exact spot. No account. Bonus: an MCP bridge lets Claude Code and Cursor use it all in your browser.