The problem
How big is your target market, really? Most answers are guesses, and the tools that know charge you before you can even count.
What Claude Code did
Claude built a lightweight app over a consumer identity graph that only calls the free endpoints, so it can count all day without spending a cent. An AI planner maps plain English (coaches and consultants, 50 to 60, into golf) onto 350+ real data fields, runs the search, and even diagnoses which filter is strangling your audience when the count collapses.
The result
A 7-filter audience of 83,881 people resolved in 4 seconds. And one boolean-logic fix took Joe's Masterclass audience from 1 person to 369,560: audience collapse is usually an AND/OR bug, not missing data.