◫ FREE SEO TOOL

What is this website built with?

Identify the CMS, framework, analytics and CDN behind any site — with the evidence for every answer, not a guess.

25 checks per day · Results cached for 6 hours · Reads only the public page, exactly as a browser would.

Evidence, not guesswork

Most detectors match a single string and call it a day. That is how a site gets reported as Shopify because it mentions Shopify once in an integration script.

This one scores several independent signals per platform — asset paths, generator tags, runtime globals, response headers — and only reports a match when the evidence is structural. Every result shows what it found and why.

Why it matters

Your platform decides which SEO problems are a checkbox and which need a developer. It also decides whether content tools can publish into your site automatically, or whether someone has to paste every article by hand.

That second point is the one people discover too late — after they have already bought a writing tool that stops at a draft.

FAQ

How does a CMS detector work?

It requests the page exactly as a browser would and reads the HTML and response headers for fingerprints the platform leaves behind — asset paths like /wp-content/, generator meta tags, runtime globals, and CDN hostnames. Nothing is guessed from the domain name and no AI estimate is involved. This tool scores several signals per platform and only reports a match when the evidence is structural, so a single passing mention of a brand name is never enough.

Why does it say the CMS is unknown?

Three common reasons. The site may be custom-built or statically generated, which leaves no fingerprint at all. It may be headless, where the CMS runs behind the scenes and never touches the public HTML. Or it may be behind a proxy or bot protection that serves a stripped page to non-browser requests. Unknown is an honest answer — naming a platform without evidence would be a guess.

Can it detect headless WordPress or a decoupled CMS?

Usually not, and that is expected. In a headless setup the content is delivered through an API and rendered by a front-end framework, so the public HTML shows the framework — Next.js, Nuxt, Astro — rather than the CMS behind it. If you see a framework reported with no CMS, a headless backend is a likely explanation.

Is checking a competitor's CMS legal?

Yes. The tool only reads the page a site already serves publicly to every visitor and search engine. It does not log in, bypass anything, or access private data. It is the same information you would see using View Source in your browser.

Why does the CMS matter for SEO?

It determines what you can change and how quickly. Platforms differ enormously in how they handle canonical tags, structured data, image formats, redirects and page speed — and in whether tools can publish into them automatically. Knowing the platform tells you which SEO fixes are a settings change and which need a developer.

Can Serpling publish to whatever CMS I am running?

Serpling publishes natively to WordPress, Shopify, Next.js and Framer, and reaches anything else through a signed webhook. Webflow and Ghost native publishing are on the roadmap. If the detector reports one of the native targets, Serpling can write and publish articles into that site without you copying anything by hand.