Collection
Honest analytics
Opens, clicks and A/B tests that only count humans
Why your open rate is lying to you, how to read the real funnel, and when to trust a subject-line winner. Lower numbers — better decisions.
6 resources in this collection
Everything else
Free tool
A/B Test Calculator
Two-proportion z-test on replies — stop calling winners on noise.
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Cold email benchmarks for 2026
Delivery, replies and why the open rate is mostly fiction.
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Cold email math: 1,000 sends
Work the funnel backwards with honest numbers at every stage.
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The blog
Full archive — deliverability, strategy and outreach craft.
Read moreReady to put this into practice?
Connect a mailbox and run the same checks on your own domain.