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W3Techs Site Info vs WhatCMS: catalog facts
W3Techs Site Info	WhatCMS
Free The website lookup, bookmarklet and extensions are free to use; a separate API is offered.	Free Checking a single URL on the website is free; reports and batch detection are separate…
Web, Browser extension	Web
Identifies CMS, language, web server and hosting provider Bookmarklet and Firefox and Chrome extensions for the current page	Detects about 1,540 website technologies Reports framework, language, hosting and CDN alongside the CMS
Shows only what can be detected from outside the site Website carries advertising	Detection relies on visible artifacts and can miss customised sites Lead generation features go beyond simple site checks
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.