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/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/mo) and Scale. First 200 emails on us to start.

Start free →See pricing