Calculator
Is this result real?
Put in visitors and conversions, or revenue per user, for control and variant. You get the uplift, the p-value and whether it clears your confidence level.
Free statistics tools
The A/B test statistics toolkit
Check whether a result is real, work out how long a test needs, see what parallel testing does to your pace, and model what a year of testing is worth. Four calculators, one place.
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Four tools, four questions
Each tab answers one question you'll have at some point in a testing program.
Test planning
How long does this test need?
Set your baseline, the smallest effect worth finding and your daily traffic. You get the sample per variant and the days it takes, with tests running in parallel if you want.
Simulation
What does parallel testing do to my pace?
Compare confidence levels and numbers of parallel tests over the years: how many winners you find, how many false ones slip through, and what that earns.
Forecasting
What is a testing program worth?
Model a year of testing from your traffic, conversion rate, order value and margin, with the real cost of building and QA'ing every test.
The math tells you whether a result is real. It can't tell you what to test next. That's the part we predict, before anything gets built.
How the method works
The math is the easy part.
Knowing what to test isn't.
Book a call and bring the numbers you just worked out. We'll look at where your shop stands and what testing could realistically add. If it doesn't add up for you, we'll tell you.
See if your shop is a fit
A free 30-minute call with the team. That's it.
The guarantee, in full
At least 10% more revenue in under six months, or month seven onward is free.
When you can predict what wins, you can promise the outcome. What counts as uplift, how it's measured, and what happens if we miss is written down in plain language.
We can promise it because we know our numbers: more than 50% of our A/B tests win, across 4,000+ documented experiments. That's when a guarantee stops being marketing and becomes underwriting.