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W3Techs Site InfoWhatRuns
Free

The website lookup, bookmarklet and extensions are free to use; a separate API is offered.

 Free

Free extension with no sign-up required.

Web, Browser extension Browser extension
  • Identifies CMS, language, web server and hosting provider
  • Bookmarklet and Firefox and Chrome extensions for the current page
  • One-click technology detection
  • Covers plugins, fonts, analytics and CDNs
  • Shows only what can be detected from outside the site
  • Website carries advertising
  • Proprietary
  • Only a Chrome version is mentioned
Web application, Browser extension Browser extension
Closed source Closed source
License not stated License not stated
No account needed No account needed
Needs internet Needs internet

Checked September 23, 2026

Checked September 24, 2026

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