Flutter Web compiles Google's cross-platform Flutter framework (normally used for iOS/Android apps) down to a browser-renderable target, letting teams ship the same Dart codebase to web, mobile, and desktop. It produces one of the most unmistakable fingerprints in this database: rather than ordinary HTML, Flutter Web renders into a `<flt-glass-pane>` custom element bootstrapped by `flutter.js` — a rendering approach unique enough that AIWebsiteDetector treats it as a near-certain, high-confidence signal whenever present.
Detect Flutter Web Websites — Free Tool
Enter any URL to check if it was built with Flutter Web. Instant results, no account required.
How we detect Flutter Web — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Flutter Web Websites
Script Patterns
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 flutter web-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Flutter Web 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 Flutter Web?
You can detect if any website was built with Flutter Web 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 Flutter Web was used — with a confidence score.
How to detect if a website was built with Flutter Web?
There are several ways to detect Flutter Web: (1) View the page source and look for Flutter Web-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Flutter Web CDN domains, (3) Use our free tool — we check 5 detection signals automatically.
What websites are built with Flutter Web?
Flutter Web is used by thousands of websites worldwide. Our scanner has detected many Flutter Web-built sites across different industries. You can scan any URL to check if it uses Flutter Web.
How accurate is the Flutter Web detection?
Our Flutter Web 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.
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Detection Info
- Category
- Mobile / Cross-Platform
- Signals Used
- 5 patterns
- Accuracy
- High
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