Campagne
A/B test your subject
Send 2 to 4 subjects to part of your list. The best one then goes to everyone else. Included in the Pro, Scale and Agency plans.
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What you can test
You test the subject, and the preheader if you want. The body stays the same.
Variant A is the issue's own subject. You add 1 to 3 other subjects: B, C and D. A variant without its own preheader uses A's.
Open the issue and turn on Test several subjects in the Subject A/B test card. Then click Save the test.
Test sample
The Test sample is 10% to 50% of the audience (20% by default). It is split evenly between the variants.
Each variant needs at least 100 recipients. If the list is too small, the card warns you. Raise the sample or remove a variant.
If the list shrinks below that by send time, the test is skipped and everyone gets A.
How the winner is picked
- Winner criterion: unique opens (default) or unique clicks.
- Automatic: the best rate wins. A tie goes to A.
- Manual: you click Choose this winner. If you don't choose within 24 hours after the wait, it is picked automatically.
Timing
- The sample goes out first.
- Nobody else gets the issue during the wait: 1 to 48 hours (4 by default).
- The winning variant goes to the rest of the list.
The test can't be changed once the send has started.
The stats page compares the variants on the sample. It shows a 95% range and says if the gap is significant or could be chance. See Read your stats.