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WhatRuns vs W3Techs Site Info: catalog facts
WhatRuns	W3Techs Site Info
Free Free extension with no sign-up required.	Free The website lookup, bookmarklet and extensions are free to use; a separate API is offered.
Browser extension	Web, Browser extension
One-click technology detection Covers plugins, fonts, analytics and CDNs	Identifies CMS, language, web server and hosting provider Bookmarklet and Firefox and Chrome extensions for the current page
Proprietary Only a Chrome version is mentioned	Shows only what can be detected from outside the site Website carries advertising
Browser extension	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 24, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.