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Detailed SEO Extension vs SEOquake: catalog facts
Detailed SEO Extension	SEOquake
Free Free, with no paid tier according to the developer.	Free The extension is a free download; the linked web checker allows three free checks a day.
Browser extension	Web, Browser extension
Heading structure shown at a glance Checks X-Robots headers as well as meta tags	On-page SEO audit directly in the browser Internal link inspection and URL comparison
Closed source Page-level insights only, not a full site crawl	Homepage now redirects to a Backlinko page that promotes Semrush Deeper site-wide audits are pushed toward paid Semrush tools
Browser extension	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.