16 KB. That's the full install size. SEObolt SEO Checker is 60 to 300 times smaller than MozBar, SEOquake, SEO Minion, and every other major SEO extension on the Chrome Web Store. One click runs an instant on-page audit covering meta tags, Open Graph, Twitter Card, JSON-LD schema, heading hierarchy, image alt text and dimensions, and the internal/external link profile. Every check returns pass, warn, or fail with a specific fix. No account. No paywall. Runs entirely locally in your browser.