Geo Holdout Testing Tool
Looking for a geo holdout testing tool that measures Meta ads on Amazon? Spillmark matches US states, plans the holdout, and reports the range.
- States matched on your ship-to history
- Pre-test check at your size
- You approve before any pause
What you get
Spillmark runs geo holdout tests: ads pause in one group of states and stay on in the rest. It compares Amazon orders and reports caused sales with a range.
Free calculators help you plan. Paid Starter ($49/mo) runs the live test.
Sized before you pause
Spillmark checks your order history and shows whether a geo holdout can answer at your size. If a test cannot give a clear answer, it tells you before you approve a pause.
When this fits
Use geo holdouts when you can target Meta by location and read Amazon sales by ship-to state.
Questions
- Do I pick the states?
- Spillmark plans matched groups from your history. You review and approve before anything pauses.
- Is open-source GeoLift enough?
- You can run GeoLift yourself. Spillmark adds planning on your orders, a locked ledger, profit context and an approval flow.
- Trial?
- Yes. 7 days for $0.
Try Spillmark
Start for $0. Measure which Meta ads make you money on Amazon. You approve every move.
Start a 7-day trial for $0