How the detector works
It loads the one page you enter, the way a browser would, and reads four kinds of evidence. It never goes by the page's words: a page that mentions Wix or Elementor isn't built with them.
The generator tag
Many builders and CMSs write their name into a meta tag: Framer, Webflow, Wix, WordPress, Elementor, Ghost, HubSpot, Hugo, Astro and more.
Response headers
Some platforms answer with their own server or request-id header: Framer, Squarespace, Wix, Shopify, Vercel, Netlify and GitHub Pages.
Where files load from
A builder's own CDN is a strong sign when a page loads several files from it, such as framerusercontent.com, wixstatic.com or cdn.shopify.com. A single hotlinked image doesn't count.
Markup fingerprints
Attributes and comments only a platform writes: data-wf-site for Webflow, data-framer-* for Framer, Squarespace's HTML comment, Next.js's hydration data.
What it can detect: 38 platforms
Website builders
- Framer
- Webflow
- Wix
- Squarespace
- Carrd
- Tilda
- Weebly
- Strikingly
- Duda
- Gamma
- systeme.io
- Jimdo
- GoDaddy Website Builder
- Hostinger Website Builder
- Google Sites
- Elementor
CMS and publishing
- WordPress
- Ghost
- HubSpot CMS
- Drupal
- Joomla
- Substack
- Notion
- Super (Notion sites)
Stores and app builders
- Shopify
- Bubble
- Lovable
Frameworks
- Next.js
- Nuxt
- Gatsby
- Astro
- Hugo
- Jekyll
- SvelteKit
Hosting
- Vercel
- Netlify
- Cloudflare Pages
- GitHub Pages
Questions
How can I tell what website builder a site uses?
Look at what the page itself carries. Most builders leave fingerprints: a generator meta tag ("Webflow", "WordPress 7.0"), a response header (Framer and Squarespace sites are served with their own server header, Wix adds a request id), the CDN its images and scripts load from (framerusercontent.com, wixstatic.com, cdn.shopify.com), and builder-specific attributes such as data-wf-site. This detector checks all of these in one go and shows which ones it found.
Does it work on custom domains?
Usually, yes: generator tags, headers and asset CDNs don't change when a site moves to its own domain. A few builders leave almost no trace on a custom domain; Carrd and Gamma, for example, are only recognised on their own carrd.co and gamma.site addresses.
Why does it say no website builder was found?
Either the site is custom-built (it will still show the framework and host it found, such as Next.js on Vercel), the builder hides its fingerprints, or the site blocked the check: some sites answer automated visits with a challenge page, which tells the detector very little.
Is the detector free to use?
Yes. The detector needs no account and costs nothing. FNJ's converters and AI website builder, which it can point you to, are paid products.
Does it store the sites I check?
No. The detector fetches the one page you enter, reads it and answers. The address isn't saved; the answer is kept in memory for ten minutes so repeat checks are quick, then dropped.
Can I get the code of a site built with Framer, Webflow or Wix?
For a site you own or are allowed to convert, yes. FNJ converts a published Framer site into a Next.js project or static HTML, and captures the public pages of 11 other builders, Webflow and Wix among them, as editable static HTML. Forms, stores and other platform features need replacements.
Found the builder? Take the site with you
If it's your own site, FNJ can turn it into code you host yourself. For any site you like the look of, the AI builder can design a new one in its style.