Symfony is a mature PHP framework and component library used by enterprises, agencies, and open-source projects (it also powers large chunks of Drupal and Laravel internally) for building complex, long-lived web applications. Its most distinctive fingerprint is the Web Debug Toolbar and profiler that Symfony renders in development mode — recognizable by the `sfwdt`-prefixed element IDs and `/_profiler/` routes — alongside the `X-Debug-Token` response header its profiler bundle sets. Because these markers only appear when debug mode is left on, Symfony detection is strongest on staging environments, internal tools, and freshly-scaffolded projects that haven't yet been locked down for production — incidentally also the environments most likely to reveal whether a project was AI-scaffolded in the first place.
Detect Symfony Websites — Free Tool
Enter any URL to check if it was built with Symfony. Instant results, no account required.
How we detect Symfony — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Symfony Websites
HTML Patterns
3 patterns
HTTP Headers
1 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for symfony-specific patterns in the HTML.
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 Symfony?
You can detect if any website was built with Symfony 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 Symfony was used — with a confidence score.
How to detect if a website was built with Symfony?
There are several ways to detect Symfony: (1) View the page source and look for Symfony-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Symfony CDN domains, (3) Use our free tool — we check 4 detection signals automatically.
What websites are built with Symfony?
Symfony is used by thousands of websites worldwide. Our scanner has detected many Symfony-built sites across different industries. You can scan any URL to check if it uses Symfony.
How accurate is the Symfony detection?
Our Symfony detection engine checks 4 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
Rate this Builder
No ratings yet — be the first!
Detection Info
- Category
- PHP Framework
- Signals Used
- 4 patterns
- Accuracy
- High
Similar Builders
Recently Analyzed Symfony Websites
User Reviews
No reviews yet. Be the first to review Symfony.