Tools
Free calculators for people who run experiments, each linked to the guide that explains it and the experiments that need it, with no registration wall.
What these are
Each tool does one piece of the arithmetic an experiment needs, in the browser, from the numbers you type, with its formula, assumptions and limits under the result. Nothing is stored or sent anywhere. The sample size calculator says how many visitors a test needs; the feasibility checker asks the same arithmetic the other way round, before a quarter is committed. Six more are planned, each listed here the day it ships.
Shipped
Give us one funnel.
Twenty five minutes, about how you run experiments today. No access, no commitment.