What is CrumbTrail?

Most websites embed third-party scripts from analytics providers, advertising networks, and behavior tracking tools. These scripts silently observe how visitors interact with pages and follow users across different sites — leaving a trail of digital crumbs.

CrumbTrail helps you visualize those external services. Enter any URL and CrumbTrail will fetch the page, extract all third-party resource references, and show you which tracking companies are present — grouped by category and scored by privacy impact.

How the scan works

1. 1User enters a URL into the CrumbTrail scanner.
2. 2The server securely fetches the raw HTML of the target page.
3. 3Cheerio parses the HTML to extract resource references.
4. 4Script sources, iframe embeds, and link hints are collected.
5. 5Each external domain is compared against a known tracker dataset.
6. 6Trackers are categorized and a privacy score is computed.

Limitations

• –Does not access or read private cookies from any website.
• –Does not execute JavaScript — only static HTML is analyzed.
• –Detects known services based on embedded resources, not behavior.
• –Dynamically loaded trackers (injected after page load) may not appear.
• –Scanner results reflect a single page fetch, not full site behavior.