Most A/B tests call a winner off a blip in open rate, days too early. This one waits for real statistical confidence on what actually matters — genuine positive replies — then promotes the winner automatically.
No guessing. No calling it early because someone's impatient. Just a confident answer, once there's actually enough data to have one.
A subject line that gets opened more isn't a winner — it's just curious. The only test that matters is whether the email underneath actually gets a real reply.
No manual tracking, no spreadsheet, no deciding when to call it. It runs itself, with discipline.
What: Every reply is classified. Only genuine interest and meeting requests count toward a "win." Opens and clicks never do.
Why it matters: A subject line can get opened by everyone and still sit on a dead offer. Replies are the only signal that someone actually cared.
What: No variant gets crowned off 20 sends and a lucky morning. The test runs until both arms clear a minimum send count and a minimum number of days.
Why it matters: Calling a winner early is the single most common A/B testing mistake. Noise looks like a pattern until you have enough data to tell the difference.
What: Instead of a binary yes/no significance check, it tracks a Bayesian confidence read — how sure the data makes it that B genuinely beats A — and only acts once that certainty is high.
Why it matters: A test that's 51% likely to be right isn't a result. One the engine is genuinely confident about is.
What: Once confident, the winning copy is promoted automatically and the losing variant retires. The result is saved as a lesson for future campaigns, and the engine keeps watching the winner afterward in case performance drifts.
Why it matters: A test result that disappears the moment the test ends has no compounding value. This one doesn't disappear.
A/B testing comes with every Compass campaign — no separate setup, no extra toggle to find.