Split Test Email Subject Lines in GoHighLevel to Boost Open Rates
By Marnix Geerkens. Published 2025-11-21. Updated 2026-06-02.
Subject lines decide whether an email gets opened or ignored, and GoHighLevel lets you test two of them against each other inside a single campaign. A portion of your list sees variant A, another portion sees variant B, and the platform automatically sends the winner to everyone else after the test window closes. You get real data from your actual audience without running a separate tool.
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Summary. GoHighLevel's built-in A/B testing for email campaigns works directly inside the email editor. Toggle on AB Testing, choose subject line as the test variable, write two variants, set the percentage distribution and the test duration, then schedule or send. When the test period ends, GoHighLevel tracks which subject line produced more opens and delivers that version to the remaining contacts automatically.
Steps
Create or open an email campaign
Go to Marketing, Emails, and click Create Campaign. Choose a template or start from blank to open the email editor.
Enable A/B testing
In the top left of the editor, click the AB testing button and toggle it on.
Set test parameters
Choose Email Subject as the test variable. Set the duration (8 hours is the default) and the number of variations. Enter a different subject line for each variant.
Adjust the audience split and send
Use the slider to set what percentage of your list each variant receives. The remainder goes to the winner after the test. Click Send or Schedule when ready.
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Frequently asked questions
Can I test email content instead of just the subject line?
Yes. Toggle AB testing on and choose email content as the variable instead.
Where do I see which subject line won?
Open the email campaign reports after the test ends to view performance by variant.