Kindlefish's own book market data: hundreds of thousands of books, reader search phrases, and category sales measurements (those land in weekly batches). Fee only states numbers it has looked up or measured for you — never a guess from memory.

Category sales measurements land in weekly batches, and the exact 'as of' date travels with the data Fee shows you. When history is still building for a category, Fee says so.

Fee never guarantees sales or income, never invents a number ('not measured' beats a guess), and never recommends gaming the store — no category stuffing, no review schemes. Honest research only.

Talking with Fee is free — free accounts get 2 conversations each month, and Pro gets plenty more. You only use a Pro credit or pay the $7.99 one-report unlock when you generate the full report. Pro includes 3 report credits monthly, and Pro credit top-ups are $4.99.

The report at the end is the same trusted Publish-Ready report. The conversation is how you and Fee align on strategy first, so the report lands pre-loaded with your decisions.