Subject lines. You define two variants, a test percentage, and a wait window; the winner sends to the rest of the list.

Can I A/B test with a scheduled send?

Yes. Schedule the campaign and attach an A/B test so the experiment starts when the job fires.

Growth plan and up

Subject lines, settled by data.

Stop guessing. Send two variants to a test cohort, wait for the signal, then let Hatched Send deliver the winner to the rest of the list.

Start sending free →See pricing

How a test runs

Attach a subject-line A/B test to a campaign send. Choose the test percentage and how long to wait. We send variants A and B to that slice, measure performance, then send the winning subject to everyone who was held back.

Same templates, same audience, same deliverability stack. Only the subject changes.

In the campaign

Configure once per send

Two subjects

Variant A and B. Clear contrast beats tiny word tweaks.

Test size

Pick what % of the list gets the experiment first.

Wait window

Hours for opens to land, then the winner goes wide.

← Scheduled sends All capabilities Automations →

Before you commit

Questions about a/b testing

Growth ($29 USD/mo) and Scale. Free and Starter can still send campaigns, upgrade when you want subject tests.

Ready when you are

Ship smarter subjects.

A/B testing on Growth ($29 USD/mo) and Scale. First 200 emails on us to start.

Start free →See pricing