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About the GTM Kit Tracking Health Check scanner

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What is this?

You are probably here because you found this line in your server logs:

Mozilla/5.0 ... Chrome/131.0.0.0 Safari/537.36 GTMKitChecker/1.0 (+https://gtmkit.com/tracking-health-check/about)

That request came from the Tracking Health Check, a free tool by GTM Kit that analyzes how well tracking works on a web page: whether Google Tag Manager loads, how cookies behave, whether consent mode is configured, and how tracking scripts affect page speed. Someone (usually the site owner, their agency, or a developer working on the site) entered your URL and requested a scan.

What the scanner does

  • Loads one page, once, in a standard headless Chrome browser, the same way a normal visitor’s browser would.
  • Records which tracking scripts and cookies the page itself uses, then produces a report for the person who requested the scan.
  • Identifies itself honestly with the GTMKitChecker user agent on every request. It never pretends to be a regular visitor.

What the scanner does not do

  • No crawling. It never follows links or visits more than the one URL that was submitted.
  • No interaction. It doesn’t click, fill in forms, log in, or accept cookie banners.
  • No scraping. It doesn’t store your page content, only technical metadata about tracking scripts and cookies.
  • Strict limits. A scan aborts after 300 requests or 25 MB of transfer, and never runs longer than two minutes.

How often does it scan?

Only when a person requests it. Results are cached for 24 hours, so repeated requests for the same page within a day do not trigger new scans, and each requester is rate limited.

How do I block it?

Block the user agent GTMKitChecker in your server or firewall configuration. The scanner does not attempt to circumvent blocks; if your site refuses the request, the scan simply fails.

Report removal

Scan reports live at unlisted URLs, are excluded from search engines, and are deleted automatically after 12 months. If a report about your site exists and you want it removed, contact us at gtmkit.com/contact with the report URL or your domain name, and we will delete it.

Who runs this?

The Tracking Health Check is operated by TLA Media, the company behind GTM Kit, a Google Tag Manager integration plugin for WordPress.