Spot the CMS, framework and server software powering any site.
Detection is based on visible HTML markers and response headers — it can miss technologies that don't leave a public fingerprint, and can't see server-side languages that produce no distinguishing trace.
Website Technology Checker scans a page's HTML markup and HTTP response headers for recognizable fingerprints left behind by common content management systems, JavaScript frameworks, CSS frameworks, CDNs and analytics platforms — the same general approach tools like Wappalyzer and BuiltWith use, applied here to a focused, common set of the most widely used web technologies.
Different platforms leave distinctive, detectable traces in what they send to the browser. WordPress sites almost always reference /wp-content/ or /wp-includes/ paths for their assets. Shopify stores load scripts from cdn.shopify.com. React apps typically include a data-reactroot attribute or bundle references. Next.js apps serve static assets from a distinctive /_next/static path. This tool fetches the page's HTML through a CORS relay and tests it against a set of pattern matches for these and other common technologies, while separately checking the Server and X-Powered-By response headers for web server and backend hints.
Front-end frameworks, popular CMS platforms, CDNs and widely used analytics scripts are generally detectable this way because they load recognizable public assets. What this approach fundamentally cannot see is server-side-only technology that produces no client-visible trace — a custom backend written in any language, using a database with no public fingerprint, will show nothing here regardless of what it's built with. Some sites also deliberately minify, obfuscate, or strip identifying markers for security-through-obscurity reasons, which will reduce detected results even for otherwise well-known platforms.
Agencies use this as a quick first look at a prospective client's current site before a redesign quote. Developers use it to understand roughly what stack a site they're integrating with or referencing is built on. Competitive researchers use it to see which e-commerce platform, page builder, or analytics stack competitors have standardized on.
Some WordPress sites use security plugins that specifically hide default WordPress paths and headers to reduce their attack surface — this can cause a false negative here.
Only indirectly, and only if the server header or a powered-by header discloses it — many production servers deliberately omit or genericize this information.
Yes — this only reads publicly served HTML and headers that any visitor's browser already receives; it doesn't access anything private or bypass any access control.
Next.js is a framework built on top of React, so sites using it will typically show fingerprints for both — that's expected and correct, not a duplicate detection error.
No — it means the site is using Cloudflare's CDN/security proxy in front of its actual origin server, which is extremely common and separate from who actually hosts the underlying application.
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