Tech stack detector
Paste a URL and see what it is built with — the CMS or site builder, the front-end framework, hosting and CDN, analytics, pixels, chat widgets, fonts and payment scripts — read from the page source and the response headers.
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How it works
- We fetch the page once and keep the response headers (Server, X-Powered-By, CDN and cache headers).
- The HTML is matched against a list of signatures: generator tags, script and stylesheet paths, class names, cookie names.
- Findings are grouped: platform, framework, hosting/CDN, analytics, marketing, widgets, fonts, payments.
- A signature match is evidence, not proof — a site that mentions a tool in text is not using it, so we only match code, not prose.
Questions people ask
How accurate is it?
Good for platforms and popular scripts — those leave fingerprints in every page. Custom-built sites show fewer results, and a site behind a CDN may hide its real server.
Why do you want to know a competitor's stack?
To judge how fast they can change things, what it costs them, and which integrations they rely on. Shopify plus Klaviyo is a different business from a custom Next.js app.
Can it see the database or the programming language?
Only when the server admits it in a header (X-Powered-By: PHP) or the platform implies it (WordPress means PHP and MySQL). Nothing behind the web server is visible from outside.
Does it detect plugins?
On WordPress, yes — the plugin folder paths in the HTML give them away. On other platforms the equivalents are apps and embeds, and the common ones are in the list.
Is this the same as a security scan?
No. It reads what is public. Knowing the stack is the first step of both a competitive analysis and a security review, but this tool stops at the inventory.
Free, no signup. Runs on our servers, nothing is installed. Want all of it at once? The full site check runs 30+ tests in one go.