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Marketing's collective memory

checked and graded so you can build on evidence

Publishers and sources we grade

Cards — All tiers

883

Each card
has a reliability tier

Because not every insight
is worth an action

Stacy's Brain exists because a vendor survey and a peer-reviewed experiment get quoted with the same confidence — and they shouldn't be. Vendor reports, case studies, and academic papers all use different methods and samples; we grade the difference so you don't have to guess it.

Browse our evidence-based collections
Claude

Rated marketing evidence, inside Claude

Ask any assistant for a marketing benchmark
and you'll get a number.

You won't get the part that matters: that it came from a company selling the thing the number promotes, that the sample was their own clients, and that it's two years old.

Connect Stacy's Brain and every marketing number Claude gives you comes back with a reliability tier, the study behind it, and what that study doesn't cover.

Stacy’s brain newsletter

For people who want to know what a stat means,
not just what it says

  • Bi-weekly newsletter interpreting the latest data and what is actually worth trying
  • Our own experiments, run and measured in-house — the kind of primary data vendor reports don't have
  • The claims everyone's reposting — and whether it'd actually survive our tier formula
coming soon

Turn our stats into
a plan you can defend

Browse, save, share – for free

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