Compare software

W3Techs Site InfoWappalyzer
Free

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

 Freemium

The extension is free. Bulk lookups and the API are paid.

Web, Browser extension Browser extension
  • Identifies CMS, language, web server and hosting provider
  • Bookmarklet and Firefox and Chrome extensions for the current page
  • Immediate answer to what a site is built on, with no setup
  • Shows only what can be detected from outside the site
  • Website carries advertising
  • The extension became closed source and the company monetises technology data
  • Detection relies on fingerprints and is sometimes wrong
Web application, Browser extension Browser extension
Closed source Closed source
License not stated License not stated
No account needed Not stated if an account is needed
Needs internet Not stated if it works offline

Checked September 23, 2026

Checked September 22, 2026

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