Original Research

14 cookie banner A/B tests. Here's what actually moves opt-in rates.

6 months. 220 sites. 12 million banner impressions. The playbook that consistently lifted opt-in rates by double digits.

  • All 14 tests ranked by impact and statistical significance
  • Why bottom banners beat centre modals by 23%
  • The copy change that lifts opt-in by ~10%
  • What did NOT work (so you don't waste a sprint)

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