GTM Helper is a Chrome add-on developed by mbaersch that allows users to inspect GTM containers, inject container codes, dataLayer pushes, and script code on selected domains. This tool is particularly useful for testing Google Tag Manager (GTM) tags and triggers.

With GTM Helper, users can easily check the GTM container setup on analytrix.de for a quick verification. However, it's important to note that the user interface is only available in German.

The latest version, 1.25, includes added support for consent managers such as Kick Consent Manager, Cookie Information, and TrustArc. Previous versions, like 1.24, also introduced support for consent managers like Cookie Law Info, Cookie Notice & Compliance, Borlabs Cookie (alternative version), Axeptio, and Compilanz.

In addition to consent manager support, GTM Helper has also made UI improvements and fixes in versionVersion 1.22 introduced a new function to reset localStorage and cookies for consent tools of various consent managers.

Overall, GTM Helper is a valuable tool for GTM container testing and offers convenient features for injecting and inspecting GTM-related code on selected domains.