porterzip is a small US team that reads a brand's own customer data and finds where it is growing on its own. We publish the math and measure the lift on your own campaigns. That is the whole company.
The market around offline marketing runs on stories. Where your brand is loved. A score with a confident decimal. A case study about word of mouth with no holdout behind it. A marketer deserves better than a number they cannot check.
So we built the opposite. We score the residual, not the level. We show you the misses, not only the wins. And we prove every claim on your own data before a dollar changes hands. If the signal is not there, we say so.
We measure acceleration that population and spend cannot explain. We never quote a word-of-mouth percentage, because there is no honest one.
Where you already sold is not where you are catching on. We score the difference.
We never run your ads or print your mail. We are the targeting layer, and the decision is always yours.
Proof beats belief. The backtest is the demo, the holdout is the renewal.
We are new, and we are honest about that. We do not have a wall of logos yet, and we would rather earn your trust with a backtest on your own data than borrow it from someone else's. porterzip is built in the US by 3rdrock dev.
Founder and team bios go here once you put names to it.
Bring us your next campaign and we will show you where to point it, then measure what it returned.