Free A/B testing tools
Calculators and checkers for planning and reading split tests. They run in your browser: no signup, nothing to pay, and your numbers never leave your screen.
Work out how many visitors each version of your A/B test needs, from your conversion rate and the smallest lift you care about. Free, no signup.
Paste your visitors and conversions to see the lift, the chance version B beats A, the p-value and a confidence interval. Free, no signup.
Find out how many days your A/B test needs from your daily traffic, conversion rate and the lift you want to detect, rounded to full weeks. Free.
Compare two versions on revenue per visitor, not clicks. See when more signups or orders actually means less money. Free, no signup.
Find the smallest lift your traffic can reliably detect in a set number of weeks. Tells you whether a test is worth running before you start.
Check whether your A/B test's traffic split is broken. Enter visitors per version and the split you expected; get a chi-square test in one click.
See what split testing is worth: extra revenue a month and a year from the tests you run, how often they win and how big wins are.
More than 100 specific A/B test ideas for landing pages, pricing, checkout, onboarding, paywalls, cancel flows, ads and SEO. Filter by page and business.
Let Outtest run your split tests
AI agents read your analytics and payments, find where you lose the most money, build the fix and test it. Every test is judged on revenue, not clicks. Plans from $29 a month.