Stacy’s Brain

Stacy's Brain is a database of marketing and growth statistics, built as marketing's collective memory. It helps marketers, founders, and solo builders find numbers they can base a strategy on, with 750+ insights from 80+ studies, experiments, and vendor reports. Each insight shows its source, sample, and a reliability tier from S to D based on methodology, sample size, age of evidence, and vendor interest, so you can judge how much to trust it before use. The platform also offers research reviews, answer collections for common marketing questions, paid media benchmarks, and a weekly newsletter.