Headless UI is an unstyled, fully accessible component library from the Tailwind CSS team, providing interactive primitives (dropdowns, modals, menus) with all behavior and accessibility handled but no visual styling imposed — meant to be paired with Tailwind CSS. Our engine detects it through 1 script pattern and 1 HTML pattern tied to its ARIA-attribute conventions on interactive elements, which is a lighter signal than fully-styled libraries since there's no distinctive CSS class prefix to match against. Documented at headlessui.com.
Detect Headless UI Websites — Free Tool
Enter any URL to check if it was built with Headless UI. Instant results, no account required.
How we detect Headless UI — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Headless UI Websites
Script Patterns
1 patterns
HTML Patterns
1 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for headless ui-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Headless UI domains.
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 Headless UI?
You can detect if any website was built with Headless 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 Headless UI was used — with a confidence score.
How to detect if a website was built with Headless UI?
There are several ways to detect Headless UI: (1) View the page source and look for Headless UI-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Headless UI CDN domains, (3) Use our free tool — we check 2 detection signals automatically.
What websites are built with Headless UI?
Headless UI is used by thousands of websites worldwide. Our scanner has detected many Headless UI-built sites across different industries. You can scan any URL to check if it uses Headless UI.
How accurate is the Headless UI detection?
Our Headless UI detection engine checks 2 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
- 2 patterns
- Accuracy
- High
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