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Free CRO and A/B testing tools
Free tools to plan, read and price your tests.
The calculators I use myself: what a conversion lift is worth, how long a test must run, whether a winner is real and whether the traffic split is broken. Free, private and in your browser.
CRO ROI calculator
See what a conversion lift is worth per month and per year for your store or lead gen site.
Open the toolA/B test sample size calculator
How many visitors and how many days your test needs before you can trust the result.
Open the toolA/B test significance calculator
Is your winner real or just noise? Get the p-value, the lift and its confidence interval.
Open the toolSRM checker
Check if your traffic split matches what you set. A mismatch means the test can’t be trusted.
Open the toolLet’s talk
Let’s make your next test a winner.
Tell me about your funnel. I’ll point out quick wins, tell you what I’d test first, and say honestly whether I’m the right fit.