Preact is a JavaScript Framework that powers thousands of websites. Our detection engine uses multiple signals to identify Preact-built sites with high accuracy.
Detect Preact Websites — Free Tool
Enter any URL to check if it was built with Preact. Instant results, no account required.
How we detect Preact — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Preact Websites
Script Patterns
1 patterns
CDN Domains
2 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for preact-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Preact domains.
3. Check CDN Domains
Network requests to these CDN domains indicate a Preact site:
cdn\.jsdelivr\.net\/npm\/preactunpkg\.com\/preact4. 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 Preact?
You can detect if any website was built with Preact 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 Preact was used — with a confidence score.
How to detect if a website was built with Preact?
There are several ways to detect Preact: (1) View the page source and look for Preact-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Preact CDN domains, (3) Use our free tool — we check 3 detection signals automatically.
What websites are built with Preact?
Preact is used by thousands of websites worldwide. Our scanner has detected many Preact-built sites across different industries. You can scan any URL to check if it uses Preact.
How accurate is the Preact detection?
Our Preact 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
- JavaScript Framework
- Signals Used
- 3 patterns
- Accuracy
- High
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