Free tool · No signup
See what any website is built with.
Detect the CMS, framework, hosting, analytics, and libraries behind any URL.
Questions
- How does the detector figure out what a site uses?
- It fetches the page and reads the public signals every site exposes: HTTP headers, meta generator tags, cookie names, script and asset paths, and known file patterns. Nothing intrusive — the same evidence a browser already receives.
- Why does it miss some technologies?
- Server-side languages, databases, and anything behind a CDN or reverse proxy often leave no public fingerprint. Sites can also strip headers and generator tags deliberately. Treat empty results as unknown rather than absent.
- Is it legal to check a competitor's tech stack?
- Yes. The tool only reads what a site publicly serves to any visitor, which is the same information available from your browser's developer tools. It is a standard part of competitive and technical research.