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

# A/B tests

> Learn about testing different variations of your campaign.

# A/B tests

Learn about testing different variations of your campaign.

A/B testing allows you to compare different versions of your campaign to see which performs better. Test different subject lines, content, or send times to optimize your campaign performance.

## How A/B testing works

1. Create two or more variations of your campaign
2. Split your audience into groups
3. Send different variations to each group
4. Analyze the results to determine the winner
5. Send the winning variation to the remaining audience

## What to test

* **Subject lines**: Test different messaging approaches
* **Content**: Try different copy or images
* **Send times**: Find the optimal time to reach your audience
* **Call-to-actions**: Test different CTAs

**See also:**

* [Send a campaign →](/campaigns/quickstarts/send-a-campaign)