Sample Size is a Chrome extension aimed at providing users with a straightforward method to determine the necessary sample size for A/B testing. By entering essential metrics such as baseline conversion rate, minimum detectable effect, statistical power, and significance level, users receive a precise estimate of the subjects required per variation to ensure statistically significant outcomes.

This free tool is particularly beneficial for marketers, researchers, and data analysts who need to make informed decisions based on A/B test results. The user-friendly interface facilitates quick calculations, making it easier to plan experiments effectively and optimize conversion rates in various projects.