Resources
CRO tools and guides
Free tools and practical guides for running A/B tests that give clear answers. No sign-up needed.
Guides
How long should you run an A/B test?
Why the duration is decided before you start, why it's always in full weeks, and why you shouldn't stop at the first significant result.
Read the guide →A/B testingBayesian vs frequentist A/B testing, in plain words
What each method tells you, when to use which, and why neither lets you stop a test whenever it looks good.
Read the guide →PrioritisationICE, PIE or RICE: how to prioritise A/B test ideas
How each framework scores ideas, where each one falls short, and how to base confidence on evidence instead of gut feeling.
Read the guide →CRO auditWhat is a CRO audit, and what should it include?
The five parts of a good audit, what you should get at the end, how to prepare and the red flags to avoid.
Read the guide →HiringFreelance CRO consultant or agency: which do you need?
An honest comparison of cost, capacity and expertise, plus the questions to ask before you hire either.
Read the guide →ROIHow experimentation makes money, and how to prove it
How to value winning tests and the losses you avoided, work out the ROI of a testing programme, and report it honestly.
Read the guide →New guides are added regularly.