What is this website built with? How to check any site's platform

What is this website built with? The answer is usually in three places: the page source, the generator tag and the response headers. Content management systems, shop platforms, site builders and frameworks all leave their names in at least one of them. This guide shows where to look and lists the tells for the platforms you'll meet most.

1. Search the page source

Open the source with Ctrl+U on Windows or Option+Command+U on a Mac, then search it with Ctrl+F. Most platforms serve files from paths or domains with their name in them:

Platform	Search the source for
WordPress	/wp-content/, /wp-includes/
Shopify	cdn.shopify.com, Shopify.theme
Wix	static.wixstatic.com, wix.com
Squarespace	static1.squarespace.com
Webflow	data-wf-page, website-files.com
Framer	framerusercontent.com
Ghost	ghost in the generator tag, /content/images/
Next.js	/_next/static/, __NEXT_DATA__
Lovable	gptengineer.js, /lovable-uploads/, data-lov-id
Bolt	bolt.new/badge.js, Made with Bolt
v0	A generator tag naming v0, v0 App title

If the source is almost empty, the page is built by JavaScript after it loads. Press F12 and search the Elements panel instead, which shows the finished page.

2. Read the generator tag

Many platforms announce themselves in a meta tag near the top of the source:

<meta name="generator" content="WordPress 6.8">

Search the source for generator. WordPress, Wix, Squarespace, Webflow, Ghost, Hugo, Framer and several AI builders use it. Some site owners remove it, so a missing tag proves nothing.

3. Check the response headers

Open the developer tools, go to Network, reload, and click the first request. Under Response Headers, look at:

• server: the web server or host, such as Vercel, Netlify, cloudflare or nginx
• x-powered-by: sometimes the platform itself, for example Next.js, PHP or Bolt.new
• Platform-specific headers, such as Shopify's x-shopid or Wix's x-wix-request-id

Headers tell you about the hosting, which is useful when the page itself has been tidied up.

4. Or let a tool do it

Technology checkers automate all of the above:

• Wappalyzer and BuiltWith are browser extensions and websites that list the platform, framework, analytics and other services a site uses. As read on October 10, 2026, Wappalyzer's public directory has entries for AI builders such as Lovable and Base44, and BuiltWith has a Lovable page. We did not find Bolt or v0 in Wappalyzer's directory.
• Detectors built for AI builders answer a narrower question: was this made with Lovable, Bolt or v0? Seven are compared in best AI-generated website detectors.
• Your browser's developer tools remain the most reliable option when an extension isn't sure.

Keep in mind that extensions and lookup sites see the addresses you check. For anything private, the manual method keeps it on your computer.

What about AI builders?

Technology checkers answer "what is this built on?", and for an AI-built site the answer is often just "React, Tailwind CSS and Vite". That's accurate but misses the more interesting part: whether an AI builder generated the site, and which one. The builder's own fingerprints, such as its hosting domain, runtime script or response header, answer that. Our guides cover Lovable, Bolt, v0 and Base44, and the fingerprint reference covers the rest. For the fingerprints builder by builder, see how to tell if a website was built with an AI builder.

Kitsuvo focuses on that question. It reads the source, the loaded scripts and the hosting of every page you open, scores it from 0 to 100 for signs it was built with AI, names the builder when it can, and shows the evidence. It runs on your computer and is free.