E-books/we sent ...
We sent 50,000 emails. AI vs human. Here's who won.
Mailercloud ran a 6-month A/B test across 200 real campaigns — AI-written vs human-written subject lines, body copy, and CTAs. The results changed how we think about email. One finding surprised everyone.
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AI subject lines got 14.3% higher open rates-with the right prompt
AI CTAs outperformed humans by 21.8% — the most surprising result
The hybrid approach beat both by 23.4% and you can apply it this week
Feature Spotlight:
4 Numbers that will change how you write emails
but only with audience context in the prompt.
except in emails under 120 words, where AI matches exactly.
except in emails under 120 words, where AI matches exactly.
The exact workflow is in chapter 7 of the report.
What's Inside
8 chapters, Zero speculations
- Ch. 01
Subject line results
Which wins on open rates and the 3 patterns AI uses that humans don't.
- Ch. 02
Body copy results
Where humans lead and the one condition where AI wins by 55.8%.
- Ch. 03
CTA results
Why AI CTAs feel less like advertising — and perform better because of it.
- Ch. 04
The surprising winner
Neither AI nor human won. The hybrid model that beat both.