shadcn/ui is not a traditional npm component library but a collection of copy-paste React components built on Radix UI primitives and styled with Tailwind CSS — developers copy the source directly into their own codebase rather than installing a package, which has made it extremely popular for AI-assisted and rapid-prototyping workflows since 2023. Our engine detects it through 1 HTML pattern matching its characteristic component class-naming and data-attribute conventions inherited from its Radix + Tailwind foundation. Because the code is vendored into each project, signal strength can vary more than with installed libraries. Documented at ui.shadcn.com.
Detect shadcn/ui Websites — Free Tool
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How we detect shadcn/ui — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect shadcn/ui Websites
HTML Patterns
3 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for shadcn/ui-specific patterns in the HTML.
4. Use AI Website Detector (Easiest)
Our automated scanner checks all these signals at once and gives you an instant confidence score. Just enter any URL above.
Frequently Asked Questions
Is this website built with shadcn/ui?
You can detect if any website was built with shadcn/ui 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 shadcn/ui was used — with a confidence score.
How to detect if a website was built with shadcn/ui?
There are several ways to detect shadcn/ui: (1) View the page source and look for shadcn/ui-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to shadcn/ui CDN domains, (3) Use our free tool — we check 3 detection signals automatically.
What websites are built with shadcn/ui?
shadcn/ui is used by thousands of websites worldwide. Our scanner has detected many shadcn/ui-built sites across different industries. You can scan any URL to check if it uses shadcn/ui.
How accurate is the shadcn/ui detection?
Our shadcn/ui detection engine checks 3 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
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Detection Info
- Category
- UI Library
- Signals Used
- 3 patterns
- Accuracy
- High
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