A/B testing means showing two versions of a page, ad or email to similar people and keeping the one that performs better. It replaces guesswork with evidence.
What to test first
Start with changes likely to make a big difference:
- Headline and offer.
- Form length or type (form vs WhatsApp).
- Main image or video.
- Call-to-action text.
- Price presentation.
Small details like button colour rarely matter unless you have huge traffic.
How to run a test
- Choose one change and write down what you expect to happen.
- Split traffic evenly between version A and version B.
- Run the test for full weeks, to include weekdays and weekends.
- Wait until you have enough visitors and conversions.
- Check whether the difference is statistically reliable.
How many visitors do you need?
It depends on your conversion rate and how big an improvement you want to detect. Small sites often need several weeks. Our sample size calculator tells you the number.
Is the result real?
A difference after two days is often luck. Use our A/B test calculator to check confidence; aim for 95% before declaring a winner.
Testing ads
Meta’s A/B test feature and simply running several ads in one ad set both let you compare creatives. Judge on cost per lead or customer, not clicks.
Common mistakes
- Stopping a test too early.
- Changing several things at once.
- Testing tiny details on low traffic.
Want the full picture? This article is part of Landing pages: the complete guide, our in-depth guide with everything in one place.
