Dedicated setup modal
A focused screen for the test — name, variants, metric, pilot %, sample size, confidence, winner strategy. No accidental audience selection, no schedule fields, no clutter.
A/B testing
A/B testing that picks the winner for you
Pilot a slice of the audience, let Mailbase choose the winner by reply rate, roll the winner out to the rest in one click.
Most email tools either skip A/B testing or hide it behind a confusing wizard. Mailbase ships a dedicated A/B test setup modal — two to four variants, the metric you care about, the pilot %, the confidence threshold, the winner strategy. Save it as a draft; attach it to a campaign when you're ready.
Real statistical winners
Open, click, reply, or conversion as the metric. Confidence threshold defaults to 90% with a custom-set sample-size floor — Mailbase only calls a winner when the math is real.
One-click rollout
Manual override available, auto-rollout when thresholds clear. The winning variant goes out to the rest of the audience without you re-building the campaign.
What it ships with
- 2–4 variants per test, subject + MJML body each
- Metrics: open, click, reply, conversion
- Confidence: 80% · 90% · 95% · 99%
- Auto-winner or manual override
- Variants saved as a draft A/B campaign — attach to a campaign whenever
Try it in your workspace.
Free to start. No credit card. Self-hosted or managed sending.
Start free