Stacy's Brain is a newsletter on evidence-based marketing and growth.

Its main goal is to provide marketers, founders, and solo builders with vetted insights from the latest research, independent experiments, and vendor reports.

What sets it apart from other newsletters is its emphasis on proof and transparency. Behind the newsletter is a database of insights, classified by how much you can trust them based on methodology, sample size, age, and vendor interest.

A must-read source for anyone who wants to build a growth strategy on evidence.