Bootstrap is a CSS Framework that powers thousands of websites. Our detection engine uses multiple signals to identify Bootstrap-built sites with high accuracy.
Detect Bootstrap Websites — Free Tool
Enter any URL to check if it was built with Bootstrap. Instant results, no account required.
How we detect Bootstrap — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Bootstrap Websites
Script Patterns
1 patterns
CDN Domains
3 patterns
HTML Patterns
2 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for bootstrap-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Bootstrap domains.
3. Check CDN Domains
Network requests to these CDN domains indicate a Bootstrap site:
cdn\.jsdelivr\.net\/npm\/bootstrapstackpath\.bootstrapcdn\.commaxcdn\.bootstrapcdn\.com4. 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 Bootstrap?
You can detect if any website was built with Bootstrap 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 Bootstrap was used — with a confidence score.
How to detect if a website was built with Bootstrap?
There are several ways to detect Bootstrap: (1) View the page source and look for Bootstrap-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Bootstrap CDN domains, (3) Use our free tool — we check 6 detection signals automatically.
What websites are built with Bootstrap?
Bootstrap is used by thousands of websites worldwide. Our scanner has detected many Bootstrap-built sites across different industries. You can scan any URL to check if it uses Bootstrap.
How accurate is the Bootstrap detection?
Our Bootstrap detection engine checks 6 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
- CSS Framework
- Signals Used
- 6 patterns
- Accuracy
- High
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