How geo testing works
Split regions into test (channel suppressed) and control (unchanged), run for several weeks, and attribute the sales gap to the channel. Done cleanly, it is close to a true experiment.
Where geo testing breaks down
Regions are rarely comparable, you sacrifice real revenue in the suppressed geos, you need enough volume to detect an effect, and you wait weeks for one answer about one channel. For most DTC brands, that is too slow and too expensive to run routinely.
Find your wasted ad spend in 5–10 minutes.
Watch the model work on a sample store first, no signup. Then upload your last 40–90 days of GA4 sessions and get incremental ROAS with confidence intervals. No pixel, no SDK. €99 per read.
Prefer to talk it through? Book a 20-min call, or read how it works.
A faster alternative
Causal modeling reads the natural experiments already in your sales history - weeks you spent more or less, channels that paused - to estimate incrementality without suppressing anything, in minutes, with confidence intervals.
Frequently asked questions
Is geo testing the gold standard?
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It is rigorous, but its cost and fragility mean most brands cannot run it often.
Can I avoid the revenue loss of a holdout?
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Yes - causal modeling on historical data needs no suppression.