Free tool · Testing
Is your test a winner, or just noise?
Paste your visitors and conversions for both variants. Get the conversion rates, uplift and a proper two-tailed significance check before you roll anything out.
Your numbers
Variant A (control)
Variant B (challenger)
Results
How it works
This runs a standard two-proportion z-test (two-tailed). At 95%+ confidence the difference is very unlikely to be random luck; below 90% you genuinely don’t know yet.
Three rules I hold clients to: decide the sample size before the test, never peek-and-stop the moment it flips green, and run at least one full business cycle (7 days minimum) so weekday and weekend behaviour are both in the data.
Want the full picture, not just the maths?
My AI Ad Audit tears down your actual Meta or Google account and hands you a prioritised fix list.
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Performance marketing consultant for clinics and DTC brands across Dubai and the UK. Paid media, landing pages, tracking and creative, accountable to revenue.