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Seobility SEO Checker vs Detailed SEO Extension: catalog facts
Seobility SEO Checker	Detailed SEO Extension
Freemium Free account with 5 checks per day; paid plans start at $69.90 per month.	Free Free, with no paid tier according to the developer.
Web	Browser extension
Scored report with clear recommendations Considers AI answer engines as well as search engines	Heading structure shown at a glance Checks X-Robots headers as well as meta tags
Strict daily check limits on the free tier Paid plans are fairly expensive for individuals	Closed source Page-level insights only, not a full site crawl
Web application	Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	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.