> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gatrevo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# A/B testing

> Test two subject lines to find what resonates with your prospects.

Gatrevo supports A/B subject line testing on sequences. Half your enrolled contacts receive variant A, the other half receive variant B — helping you learn what resonates with your target audience.

## Setting up an A/B test

When creating or editing a sequence step, enter a second subject line in the **Subject line B** field. Gatrevo alternates between the two for each new enrollment.

## Viewing results

Go to **Sequences** → click a sequence → the stats panel shows enrolled, opened, and replied broken out by variant A and variant B.

Use this data to pick the winning subject line for future campaigns.