What Can Happen By Chance?

This simulates A/B tests where B turns out to be no better (= A/A tests). Any measured difference is due to pure chance, based on your actual site stats.

% of visitors who act after landing on page to be improved (conversion rate)

Number of unique visitors per month to the page to be improved

See how your test on this page can unfold by pure chance

Effects seen so far help you gauge what is likely

By running this many times, you can better understand how much your A/B test will be influenced by pure chance. Then you can run your real tests for a duration that minimizes false results to the level you want.