Builder.io is a visual development platform and AI-powered app builder that enables developers and marketing teams to create, manage, and publish web experiences through a drag-and-drop interface backed by a headless CMS architecture. Sites built with Builder.io are identifiable through a combination of technical fingerprints, including 2 distinct script patterns tied to Builder's SDK and content rendering engine, 2 characteristic HTML patterns embedded in the page markup, 1 CDN domain used to serve Builder-hosted assets, and 1 meta tag pattern that signals Builder.io-managed content. These signals work in concert to give AIWebsiteDetector.com's engine a high-confidence identification, as Builder.io's integration style leaves consistent, recognizable traces across the DOM regardless of the underlying frontend framework — whether React, Next.js, or plain HTML. Builder.io operates as a SaaS platform with tiered pricing, from a free plan for small projects up to enterprise contracts, meaning its detection signature appears across a wide spectrum of site types, from marketing landing pages to full-scale e-commerce storefronts. One characteristic that makes Builder.io particularly distinctive to detect is its reliance on a dedicated CDN domain for content delivery, which remains consistent even when the visual components are deeply embedded within third-party frameworks, providing a reliable anchor for automated detection.
Enter any URL to check if it was built with Builder.io. Instant results, no account required.
How we detect Builder.io — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
Script Patterns
2 patterns
CDN Domains
1 patterns
HTML Patterns
2 patterns
Meta Tags
1 patterns
Open the website in your browser, right-click, and select "View Page Source". Search for builder.io-specific patterns in the HTML.
Check the Network tab in DevTools for JavaScript files loaded from Builder.io domains.
Network requests to these CDN domains indicate a Builder.io site:
cdn\.builder\.ioOur automated scanner checks all these signals at once and gives you an instant confidence score. Just enter any URL above.
You can detect if any website was built with Builder.io by using our free scanner above. Just enter the URL and we'll analyze HTML patterns, JavaScript files, CDN domains, and HTTP headers to determine if Builder.io was used — with a confidence score.
There are several ways to detect Builder.io: (1) View the page source and look for Builder.io-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Builder.io CDN domains, (3) Use our free tool — we check 5 detection signals automatically.
Builder.io is used by thousands of websites worldwide. Our scanner has detected many Builder.io-built sites across different industries. You can scan any URL to check if it uses Builder.io.
Our Builder.io detection engine checks 5 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
Builder.io is a leading ai app builder used by thousands of businesses and developers worldwide. Our detection engine can identify Builder.io-built websites with high confidence by analyzing multiple technical signals.
Whether you're a developer doing competitive research, a designer looking for inspiration, or just curious about how a website was built — AI Website Detector gives you instant, accurate detection.
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