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W3Techs Site Info vs Cloudflare Radar URL Scanner: catalog facts
W3Techs Site Info	Cloudflare Radar URL Scanner
Free The website lookup, bookmarklet and extensions are free to use; a separate API is offered.	Free Free to use.
Web, Browser extension	Web
Identifies CMS, language, web server and hosting provider Bookmarklet and Firefox and Chrome extensions for the current page	Reports technologies, security and performance in one scan Nothing to install
Shows only what can be detected from outside the site Website carries advertising	Proprietary hosted service Only checks public URLs one at a time
Web application, Browser extension	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is 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.