Committing to a segment and discovering afterwards that it contains four hundred contactable people is an expensive way to learn a cheap fact.
The number that actually matters
Not how many companies exist in a sector. How many people you can reach, at the titles you need, in the geography you sell to, after the filters your ICP actually implies. That number is routinely a fraction of the first one and it is the only one that tells you whether a campaign can run for a quarter.
Why preview rather than build
Providers will tell you how many records match a query without charging you to retrieve them. Almost nobody asks, because the interface makes building feel like the natural next step. Asking first turns a segment decision into a five minute question instead of a budget line.
What you get back
A written ICP and persona brief for the campaign, and the availability read alongside it. The brief is the useful artefact even when the answer is no, because it states precisely which definition produced that number, which is what you revise when you want a different one.
Runs well with
Skills compound. These are the ones we usually install alongside it.