A/B test your subject lines

Not sure which subject line will get more opens? Now you can find out. Subject line A/B testing for email campaigns lets you send two subject line variations to a portion of your audience—then automatically delivers the winning subject line to the rest of your list.

Here's what's new

• Built into the send flow: no separate setup required. Click Add A/B test in the subject line step of any email campaign send flow to add a second variation.
• Automatic winner selection: after 24 hours, the subject line with the higher open rate is sent to your remaining recipients. No manual follow-up needed.
• Audience split preview: once recipients are added, click See details to see exactly how your audience will be divided between variations and how many recipients are waiting for the winner.
• Works for both send now and scheduled campaigns: the test runs for 24 hours from whenever your campaign sends.
• Results in Email analytics: open rates and click rates for both subject lines appear side by side, with the winner clearly marked.
• Email notifications: you'll get an email when your test starts and another when results are in.

Learn more

Learn more about subject line A/B testing in our help center