How long should an A/B test run?

Long enough to cover complete weekly cycles and collect enough data for a reliable result. Stopping early because it looks good often leads to wrong conclusions.

Does Shopify have built-in A/B testing?

Shopify does not offer general-purpose A/B testing for storefront pages on its own, so stores typically use a dedicated testing tool.

What should I A/B test first?

Start with high-traffic pages and changes backed by evidence, such as clarity of the offer, product page content, and the cart or checkout experience.

Shopify A/B Testing Guide: How to Run Tests You Can Trust

1. Check whether you have enough traffic

Tests need enough visitors and conversions to detect a difference. If your store has low traffic, changes that are clearly good ideas may be better implemented directly, while you focus tests on high-traffic pages and bigger changes.

2. Start with a hypothesis

Base it on evidence: analytics, recordings, surveys or support questions.
State the change, the reason, and the metric you expect to move.
Prioritise ideas by potential impact and effort.

3. Design the test

Change one important thing at a time so you know what caused the result.
Pick a primary metric in advance, such as conversion rate or revenue per visitor.
Split traffic randomly and keep the split stable.
Use a dedicated testing tool, since Shopify does not provide storefront A/B testing on its own.

4. Run it long enough

Cover complete weekly cycles, since behaviour differs by day.
Wait for enough data before drawing conclusions.
Do not stop the moment the result looks good.
Avoid running the test during unusual periods such as major sales unless you are testing those.

5. Learn from every test

Implement winners, and record what you learned from losers too.
Check that the gain holds after rollout.
Feed the insight into the next hypothesis.

Our A/B testing service runs this process end to end. For ideas on what to test first, use the CRO checklist.

Frequently asked questions

How long should an A/B test run?: Long enough to cover complete weekly cycles and collect enough data for a reliable result. Stopping early because it looks good often leads to wrong conclusions.
Does Shopify have built-in A/B testing?: Shopify does not offer general-purpose A/B testing for storefront pages on its own, so stores typically use a dedicated testing tool.
What should I A/B test first?: Start with high-traffic pages and changes backed by evidence, such as clarity of the offer, product page content, and the cart or checkout experience.