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