Free · Open source · Runs in your browser

Know what CTV really drives

Plan a fair geo-lift test, lock it before launch, and read incremental orders, iCPA and iROAS with honest ranges. Your files are processed on your computer and never uploaded.

Vendor vs. vendor
Each vendor runs in its own set of markets. Find out which one really drives sales.
Split the country
Vendors share the country, say 40% each, and a no-CTV group of about 20% shows what happens without it.
National campaign, small holdout
Keep CTV running almost everywhere and leave about a tenth of the country dark to measure what it adds.

For Claude users

Let Claude run the test for you

The FOSIT skill turns Claude into your incrementality analyst. It uses the same open-source engine as the tool above.

• Checks your sales data and finds a fair design: vendor vs. vendor, a vendor split, or a national holdout
• Locks the plan with a fingerprint and drafts the email to send every vendor before launch
• Reads the results and writes a CFO-ready summary, with honest ranges

Works in Claude Code. Unlike the tool above, Claude reads the files you give it: FOSIT only needs daily sales totals by market, never customer data.