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

A website builder detector is a tool that analyzes a website's code and tells you what platform or builder it was built with. Whether you want to know if a competitor uses Shopify, if a beautiful site was built with Framer, or if a startup's app was vibe-coded with Lovable — a good detector gives you the answer in seconds.

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Why You'd Want to Detect a Website Builder

Competitive research: Your competitor just launched a beautiful new site. Knowing they used Framer tells you they're investing in design quality, probably have a small team (Framer is fast for small teams), and might have limited CMS capabilities.

Before hiring an agency: Ask an agency to show you their portfolio sites. Run each one through a detector. If they claim to build custom sites but their portfolio is all Squarespace — you know.

Learning from good design: Found a site you want to emulate? Detect its builder, then learn that builder. Trying to replicate Framer's animations in WordPress is frustrating when you could just use Framer.

Sales intelligence: If you sell a product to Shopify stores or WordPress sites, a builder detector helps you identify prospects by platform.

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The Best Website Builder Detector: AIWebsiteDetector.com

AIWebsiteDetector.com is the most accurate and comprehensive free website builder detector available. It detects:

AI-native builders:

Framer, Lovable, Bolt, Durable, v0 (Vercel), Replit AI, Gamma, Dorik, Mixo, 10Web, Hostinger AI, Base44, and 50+ more

Traditional builders:

Webflow, Wix, Squarespace, Carrd, Tilda, Duda, Bubble, Softr, Glide, and more

E-commerce:

Shopify, WooCommerce, Magento, PrestaShop, BigCommerce, Ecwid

CMS:

WordPress, Ghost, Strapi, Drupal, Joomla, Contentful

Frameworks:

React, Next.js, Vue, Angular, Svelte, SvelteKit, Nuxt, Astro, Gatsby, Remix, and more

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How Builder Detection Works

When you submit a URL, the detector:

Fetches the page HTML — the raw markup reveals script sources, meta tags, class names, and HTML attributes

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.