Free tool
GA4 vs Shopify: what's the real gap?
Enter both revenue numbers for the same period. This tells you how big your gap is and whether it's normal — not whether it's broken. Only a real audit can tell you that.
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Start with an audit →Why this calculator can't tell you everything
This is a single comparison of two totals — it can tell you the size of your gap, but not the cause. The same percentage can mean a perfectly healthy setup for one store and a broken tag for another, depending on consent geography, mobile traffic, and audience. An audit is the only way to know which one you have, and what — if anything — is actually worth fixing.