Bugsnag (now part of SmartBear) is an error-monitoring and stability platform that captures and aggregates JavaScript exceptions and crashes in production, used by engineering teams that want visibility into client-side errors affecting real users. Our engine detects Bugsnag through 2 script patterns and 1 HTML pattern tied to its client-side error-reporting SDK's initialization code. Documented at bugsnag.com.
Detect Bugsnag Websites — Free Tool
Enter any URL to check if it was built with Bugsnag. Instant results, no account required.
How we detect Bugsnag — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Bugsnag Websites
Script Patterns
2 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 bugsnag-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Bugsnag 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 Bugsnag?
You can detect if any website was built with Bugsnag 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 Bugsnag was used — with a confidence score.
How to detect if a website was built with Bugsnag?
There are several ways to detect Bugsnag: (1) View the page source and look for Bugsnag-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Bugsnag CDN domains, (3) Use our free tool — we check 3 detection signals automatically.
What websites are built with Bugsnag?
Bugsnag is used by thousands of websites worldwide. Our scanner has detected many Bugsnag-built sites across different industries. You can scan any URL to check if it uses Bugsnag.
How accurate is the Bugsnag detection?
Our Bugsnag 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
- Monitoring
- Signals Used
- 3 patterns
- Accuracy
- High
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