TL;DR Click a bookmark → paste four numbers → instantly know whether two conversion rates are meaningfully different.
No tools. No spreadsheets. No dashboards. Just your browser.
Why? Have you ever been in a meeting, a Slack thread, or staring at an A/B test dashboard and thought:
“2.3% vs. 2.7% — is that actually meaningful, or just noise?”
Well then this bookmarklet is for you! Other recipients include but are not limited to…
