📄 On-Page SEO Tools

Moz's free browser toolbar overlays Page Authority and Domain Authority onto search results and individual pages, with additional on-page data available for Pro subscribers.

A sophisticated link intelligence platform with a browser toolbar component, built for link auditors and agencies that need deep backlink analysis and disavow management.

A comprehensive free browser extension from Semrush that shows SEO metrics, on-page audits, and keyword density analysis for any page you visit.

A now-discontinued free SEO tool by Patrick Sexton that checked pages against Google's speed, mobile, and accessibility guidelines. No longer available, but worth knowing about historically.