Find out exactly what's installed on your site, spot tracking issues, and get a complete diagnosis with a score and prioritized quick wins.
We simplify the technical audit so you get insights in seconds — without having to open GTM manually.
Type in the container ID (e.g. GTM-XXXX). The system fetches the published version automatically.
Select the site type — Landing Page or E-commerce — to calibrate the audit criteria.
A 0–100 score, platform inventory, prioritized quick wins, and a complete map of the container.
A 360° analysis of your tagging environment, with a clear diagnosis and prioritized actions.
A 0-to-100 rating based on best practices, event coverage, and implementation quality.
A list of High/Medium/Low improvements to fix the issues with the biggest impact on measurement.
Automatic detection of installed pixels: GA4, Meta, Google Ads, TikTok, and many more.
A structured view of all active or paused tags, triggers, and variables.
Identification of present, missing, and incomplete-payload events for e-commerce.
Alerts about consent mode, unknown scripts, and security risks in the container.
Access your previous audits anytime and track how your tracking evolves.
Generate a professional report to present to clients, your team, or managers.
GTM Audit is 100% free. There's no paid plan, we don't ask for a credit card, and there are no hidden charges. We built this tool to help the analytics community keep healthier tracking environments.
Castilho Marketing develops GTM Audit as an authority tool in the digital tracking niche — and App Tracker for those who need to go beyond auditing.
Everything you need to know before getting started.
Create your free account and get a complete diagnosis of your tracking in seconds.
No credit card. No trial. No charge.