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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.

Get the free research report
We sent 50,000 emails. AI vs human ebook
Open rates
14.3%
higher open rates

AI subject lines got 14.3% higher open rates-with the right prompt

Open rate
14.3%
Open rate graph
21.8%
Surprising result

AI CTAs outperformed humans by 21.8% — the most surprising result

Performance increase
23.4%
Hybrid approach

The hybrid approach beat both by 23.4% and you can apply it this week

Hybrid approach

Feature Spotlight:

What's inside the report

Subject lines
Subject lines
When does AI actually hurt your open rates?

The answer is in chapter 3.

Body copy
Body copy
There's one scenario where AI body copy wins easily

See the data in chapter 4.

CTAs
CTAs
The highest-performing CTA in the study wasn't written by a human

Find out in chapter 5.

The workflow
The workflow
The 5-step process that beat both AI and human campaigns

It's in chapter 8.

What's Inside

8 chapters, Zero speculations

  • Ch. 01

    Subject line results

    Which wins on open rates — and the one mistake that flips the result entirely.

  • Ch. 02

    Body copy results

    Where humans lead, and the one condition where the gap completely disappears.

  • Ch. 03

    CTA results

    The result that surprised everyone on our team. We expected humans to win this one.

  • Ch. 04

    The surprising winner

    It's not AI. It's not human. Download to find out what beats both.

And more – Get Your Free Copy
We sent 50,000 emails. AI vs human ebook