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W3Techs Site Info vs BuiltWith: catalog facts
W3Techs Site Info	BuiltWith
Free The website lookup, bookmarklet and extensions are free to use; a separate API is offered.	Freemium Free single-site lookups with paid plans for reports and bulk data.
Web, Browser extension	Web, Browser extension
Identifies CMS, language, web server and hosting provider Bookmarklet and Firefox and Chrome extensions for the current page	Identifies CMS, analytics, CDN and hosting from a single domain Free lookups for individual sites
Shows only what can be detected from outside the site Website carries advertising	Detailed reports and bulk data require paid plans Detection is inference-based and can miss or misreport technologies
Web application, Browser extension	Hosted service, Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	Needs internet
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.