Website Builder Detector: Find Out What Any Site Was Built With

Analyzes script sources — CDN domains are strong builder signals. framerusercontent.com = Framer. cdn.shopify.com = Shopify.

Reads HTML attributes — data-framer-*, data-wf-*, shopify-checkout-api-token are platform-injected

Checks response headers — some platforms announce themselves: X-Powered-By: Squarespace

Examines CSS patterns — builder-specific class names and design tokens appear in stylesheets

Calculates confidence — multiple matching signals = high confidence; single match = medium confidence

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Accuracy and Limitations

High accuracy (95%+):

Sites actively hosted on the builder's infrastructure (e.g., Framer site on framerusercontent.com CDN)

Sites with generator meta tags

Sites with obvious CDN or script fingerprints

Medium accuracy (75–90%):

Sites that have customized or partially masked their stack

Older sites that may have migrated without cleanup

Lower accuracy:

Sites that export their builder (Webflow → Netlify export) and strip platform metadata

Vibe-coded custom sites with no platform fingerprint

Sites behind aggressive CDN proxies

Even in harder cases, AIWebsiteDetector.com returns an AI probability score so you have something actionable — not just a blank result.

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Using the Detector for Your Workflow

Quick check: Just paste a URL — no account needed.

Bulk checking: The Developer API supports programmatic access for building your own workflows. Check multiple domains, build prospect lists by technology, or integrate detection into your tools.

Monitoring changes: Check a competitor's site monthly to see if they switch builders — often a signal of a redesign or technology migration.

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Frequently Asked Questions

Can a website builder detector tell the difference between similar builders?

Yes — the fingerprints for each builder are distinct. Framer and Webflow both use modern HTML, but their CDN domains, attribute patterns, and JavaScript globals are completely different.

What if the site uses multiple builders?

Some sites mix platforms — a WordPress blog combined with a Shopify store, or a custom landing page with an embedded Typeform. The detector reports all detected technologies, not just the primary builder.

Is the website builder detector free?

Yes. AIWebsiteDetector.com is completely free for single-site scans. No account required.