Free Tools
Inspect, validate, and debug your Google Tag Manager, GA4, and consent stack. Free and no login required.
Available
Upload your GTM container JSON or connect via API. Inspect tags, triggers, and variables, map dependencies, detect unused or broken elements. Export full docs as CSV.
Compare two GTM container exports side by side. See exactly which tags, triggers, and variables were added, removed, or modified between versions.
Run a live audit on any URL. Get an email report on GA4, GTM, Facebook Pixel, consent mode signals, and more — tested in a real headless browser.
Audit Google Consent Mode v2 and Microsoft UET Consent Mode. Verify tags respect consent choices, detect bypass patterns, and validate GDPR compliance — for Google, Bing, Clarity, Meta, and more.
Coming soon
Connect to your GA4 property to validate event schemas, explore dimensions and metrics, and audit your measurement configuration against best practices.
AssertionHub offers three free tools: a Google Tag Manager auditor (upload your container JSON to inspect tags, triggers, variables, and dependencies), a live website tracking audit (enter any URL to get an email report on GA4, GTM, consent mode, and more), and a GA4 explorer (coming soon). No account or login required for any of them.
The most reliable way is to run two checks: use the GTM Auditor to inspect your container for unused tags, missing consent configuration, and broken trigger dependencies, and use the Website Tracking Audit to run a live test on your site and verify what is actually firing, including GA4 events, consent signals, and duplicate tracking.
The GTM Auditor works from your container configuration and analyses structure, dependencies, and governance without visiting your live site. The Website Tracking Audit actually loads your URL in a headless browser and intercepts real network requests, so it shows you what is firing in production rather than what is configured.
No account or login is required. The GTM Auditor works entirely in your browser from a JSON export. The Website Tracking Audit only needs a URL and an email address to deliver your report.
A GTM container audit is a review of your Google Tag Manager setup to find unused tags and triggers, missing consent mode configuration, broken dependencies between elements, and governance issues. It helps you keep your container clean, compliant, and reliable without manually checking every element.