---
title: "About the GTM Kit Tracking Health Check scanner"
date: 2026-07-08
author: "cowork-docs"
---

# About the GTM Kit Tracking Health Check scanner

## 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](https://gtmkit.com/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](https://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](https://gtmkit.com/), a Google Tag Manager integration plugin for WordPress.