A/B Test Lab

Two versions of a post, a stream of views. Version B looks ahead after 40 views: call it, or wait for more data? Results reveal how many early winners were just luck.

Reading experiments
4–6 min

How to play

Watch. Views come in; each version's click rate updates.
Call it. Call A, call B, or wait for more views. Calling right early scores more; calling wrong costs points.
Three levels. Beginner, Intermediate or Expert, picked before you play: the content and the clock change, and each level keeps its own best score.

Quick tips

Small samples lie. A lead after 40 views is often noise.
Look at the gap and the views. A big gap with many views is a real winner; a small gap needs a lot more data.

One more tip in the A/B Test Lab guide →