A/B testing, also called split testing, compares two versions of a page, email or ad by showing each to a share of real visitors and measuring which does better against one goal, such as sales or sign-ups. Only one thing should differ between the versions, so the result can be explained.
In short
A fair test needs a clear goal, enough visitors to see a pattern, and a run time that covers a full cycle of weekdays. Stopping early because one version looks ahead is a common mistake. A site with few visitors may learn more from fixing obvious problems than from testing small changes.
Start where a change could matter most: the headline, the offer, the main button and the length of the form on your busiest pages. Record what you changed, why and what happened, including tests that showed no difference.
Testing is part of our conversion rate work.
A real person reads every message and replies.
