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Cold Email A/B Test Planner
Plan statistically valid A/B tests for your cold email campaigns. Enter your variants and list size to get sample sizes, timelines, and methodology recommendations.
We'll calculate sample size per variant and how many contacts remain for the winning send.
FAQ
Frequently Asked Questions
Related guides
Going deeper on cold email testing
The planner sets the math. These guides explain what the metrics mean, why deliverability changes results, and how testing fits the broader cold email stack.
Guide
What Counts as a Good Open Rate in Cold Email?
Benchmark your subject-line tests against real cold email open rates. The numbers behind a winning variant.
Guide
Cold Email Bounce Rate Explained
Bounces skew test results. Understand what an acceptable bounce rate looks like before you trust your A/B numbers.
Guide
Email Deliverability Test: How to Validate Your Setup
If your emails aren't landing in inbox, A/B test results are meaningless. Verify deliverability first.
Pillar
Cold Email Deliverability: The Complete Guide
A/B tests are one lever. Authentication, reputation, blocklists, and warmup are the others — full stack explained.
A/B Test Automatically with ColdRelay
ColdRelay has built-in A/B testing that automatically splits your campaigns, tracks results, and sends the winning variant to the rest of your list. No manual work required.
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