Test every campaign and let the winner win
A/B Test Copilot sends variants to a sample, detects the statistically significant winner, and auto-promotes it to the rest of your list mid-send, no babysitting the dashboard required.
How it works
Most teams pick a winner by hand hours after the test window closes, wasting the bigger half of the list on a loser. A/B Test Copilot sends competing variants to a sample, watches results in real time, and the moment one variant clears the confidence threshold it promotes automatically to everyone else. It's built into the campaign builder, so any send can become a test in one click.
Auto-promote mid-send
The winning variant is rolled out to the remaining list the instant it reaches statistical significance.
- 95% confidence threshold by default
- Real-time significance detection
- No manual monitoring window
- Fallback rules if no clear winner
Test what matters
Split-test subject lines, body content, CTAs, sender name, or send time, individually or together.
- Subject line and preview text
- Body copy and layout blocks
- Call-to-action variants
- Send-time optimization
Clear result readouts
See exactly which variant won, by how much, and why, with confidence and lift spelled out.
- Open, click, and conversion lift
- Statistical confidence per variant
- Per-segment result breakdown
- Learnings saved for next time
Where teams use it
Built for real revenue work.
Subject line showdowns
Pair with Subject Line Studio: take its top two scored lines and let real recipients decide the winner automatically.
Offer and CTA testing
Compare two offers or button copy on a sample, then blast the higher-converting version to the full audience without lifting a finger.
Send-time optimization
Test morning versus afternoon delivery on a slice of the list and auto-promote the window that drives more opens.
“The auto-promote feature is the whole game. We used to lose half the list to the losing version because nobody was watching at 11pm. Now the Copilot just ships the winner. Conversions are up a quarter.”
FAQ
Questions, answered.
What can I A/B test?
Subject lines, preview text, body copy and layout, calls to action, sender name, and send time. You can test a single element or run multivariate tests with up to five variants, and results break down by segment so you learn what works for whom.
How does auto-promotion decide the winner?
Variants go to a defined sample of your list. The Copilot tracks your chosen success metric, opens, clicks, or conversions, in real time. Once one variant clears the 95% confidence threshold, it's automatically sent to the remaining recipients. If no variant wins clearly, a fallback rule you set decides.
How is this different from Mailchimp's A/B testing?
Many ESPs promote a winner only after a fixed timer, and often only on opens. A/B Test Copilot promotes on true statistical significance across opens, clicks, or conversions, and it runs on live CRM segments with no per-contact fee, all inside the same platform as your data.
Does testing slow down my campaign?
No. The sample phase runs in minutes to hours depending on your list size and settings, and promotion happens the moment a winner emerges. For most sends the full audience still receives the campaign the same day, just with the better-performing version.
Stop sending the losing version
Let A/B Test Copilot find and ship your winner automatically, every send.