What is A/B Testing? Guide for Shopify Merchants

Let data, not guesswork, decide what converts best.

A/B testing (also called split testing) is comparing two versions of something — a page, popup, or button — by showing each to different visitors to see which performs better.

How does A/B testing work?

You create two variants that differ in one element — say, a popup offering "10% off" versus "free shipping." Traffic is split between them, and you measure which variant produces more conversions. The winner becomes your new default.

What can you A/B test on Shopify?

  • Popup offers and headlines
  • Call-to-action button text and colour
  • Product page layouts and images
  • Pricing and shipping messaging

How to run an A/B test

  1. Pick one element to test and form a hypothesis.
  2. Create two variants that differ only in that element.
  3. Split traffic and let the test run until you have enough data.
  4. Keep the winner and test the next element.

A/B testing your popups

Popups are ideal for testing because you can quickly compare offers, timing, and copy. Test one variable at a time — for example, a discount popup offering 10% off versus free shipping — and keep the higher-converting version.

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Frequently Asked Questions

What is A/B testing in simple terms?

It's showing two versions of something to different visitors to see which one performs better, so you can make data-driven decisions.

What should I A/B test first?

Start with your highest-impact element — often the offer or headline in your main popup or the call-to-action button.

How long should an A/B test run?

Long enough to collect a meaningful number of conversions for each variant, so the result isn't down to chance.

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