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W3Techs Site Info vs Netcraft Site Report: catalog facts
W3Techs Site Info	Netcraft Site Report
Free The website lookup, bookmarklet and extensions are free to use; a separate API is offered.	Free Free to use under Netcraft's fair use policy.
Web, Browser extension	Web
Identifies CMS, language, web server and hosting provider Bookmarklet and Firefox and Chrome extensions for the current page	Shows hosting, server and technology details in one report Includes hosting history and certificate details
Shows only what can be detected from outside the site Website carries advertising	Subject to a fair use policy Some features may not work in older browsers
Web application, Browser extension	Web application
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.