Fireshift

Fireshift reads what a website sends to Google Ads, GA4 and Meta from the outside, with no install and no account access.

It flags conversions that aren't funnel progress (page views, logins, clicks, tags on every page load), duplicate conversions, missing values and pixels that fire before consent, compares your setup with competitors' public tag containers, and alerts you when tracking breaks.

Free scan; paid teardown and monitoring.