Where A/B testing compares two versions differing in one thing, multivariate testing examines several elements at once and how they interact — revealing the winning combination, not just the winning variable.

How does multivariate testing work?

You vary multiple elements (say, subject line, hero image, and CTA), generate combinations, and measure which combination performs best. It requires a large audience to reach reliable results.

Multivariate testing vs. A/B testing

A/B testing isolates one variable and needs less traffic; MVT tests many variables and their interactions but demands a much larger sample for statistical significance.

When should you use multivariate testing?

Use it when you have high volume and want to optimize several elements together. For most senders and quick wins, A/B testing is more practical.