Firebase Authentication is Google's hosted identity service, offering email/password, phone, and social-provider login as part of the broader Firebase platform — widely used on mobile-first apps and smaller web projects that want a fast, free-tier-friendly auth backend without managing servers. Our engine detects it through 3 script patterns and 2 HTML patterns tied to the Firebase SDK's initialization and auth-state markup, the same signal family used to detect Firebase's database product, since both load from the same core SDK. Documented at firebase.google.com/products/auth.
Detect Firebase Auth Websites — Free Tool
Enter any URL to check if it was built with Firebase Auth. Instant results, no account required.
How we detect Firebase Auth — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Firebase Auth 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 firebase auth-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Firebase Auth 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 Firebase Auth?
You can detect if any website was built with Firebase Auth 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 Firebase Auth was used — with a confidence score.
How to detect if a website was built with Firebase Auth?
There are several ways to detect Firebase Auth: (1) View the page source and look for Firebase Auth-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Firebase Auth CDN domains, (3) Use our free tool — we check 5 detection signals automatically.
What websites are built with Firebase Auth?
Firebase Auth is used by thousands of websites worldwide. Our scanner has detected many Firebase Auth-built sites across different industries. You can scan any URL to check if it uses Firebase Auth.
How accurate is the Firebase Auth detection?
Our Firebase Auth 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
- Auth Provider
- Signals Used
- 5 patterns
- Accuracy
- High
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