Website Technology Detector
What a site is built with.
- Free
- No sign-up
- Instant results
Response headers
Find out what any website is built with
Curious which CMS a competitor runs on, which analytics a client already has installed, or which CDN serves a fast site? Enter a URL and the detector lists the technologies it finds, grouped into clear categories: content management systems and shop platforms, JavaScript frameworks and static site generators, CSS frameworks and libraries, analytics and tag managers, advertising, CDN and hosting, web servers and languages, payments, security, fonts and marketing widgets.
Evidence, not guesses
Every result shows what it was based on, such as a /wp-content/ path, a cdn.shopify.com script, a generator meta tag, a server: nginx header or a laravel_session cookie. That makes the results easy to verify and explains why a technology appears. Versions are shown when the page reveals them.
What it can and cannot see
- Visible: anything in the HTML of the first response and its HTTP headers, including script and stylesheet addresses, meta tags and cookies set by the server.
- Not visible: tools loaded later by a tag manager or by user interaction, back-end databases, and software hidden behind a CDN or proxy that removes headers.
Common uses
Sales and agency teams qualify leads by platform, developers check how a site they admire is built, SEO specialists confirm that analytics and tag managers are installed on every template, and site owners audit what third-party scripts their pages load. Download the result as JSON to keep a record or compare sites side by side.
Frequently asked questions
How does the detector know what a site uses?
Every platform leaves fingerprints: file paths such as /wp-content/ or /_next/, script addresses such as cdn.shopify.com, a generator meta tag, server and CDN headers, or cookie names. The detector matches the page against a table of these patterns and shows the evidence for each match.
Why is a technology I know the site uses missing?
Only the first HTML response and its headers are checked, without running JavaScript. Tools loaded later by a tag manager, server-side languages hidden behind a CDN and back-end databases cannot be seen from outside. Some sites also remove version numbers and generator tags on purpose.
Are the version numbers reliable?
Versions are shown when the page states them, for example in a generator tag or a file name like jquery-3.7.1.min.js. They are usually right, but a site may serve an older file than the one in its name, so treat them as a strong hint.
Is this like BuiltWith or Wappalyzer?
It answers the same question for a single page: which CMS, framework, analytics, CDN, server and libraries are in use. It is free, needs no extension and shows exactly why each technology was detected.
Can a site hide its technology?
Partly. Removing generator tags, renaming asset folders and stripping server headers hides some signals, but most platforms still leave recognisable paths and scripts. A clean result with few matches often means a custom build or heavy caching.