Ali Demirbaş - Lab
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Cart & Checkout

One-Page vs Multi-Step Checkout A/B Test

A single-page checkout may reduce navigation between steps but feel denser at first glance.

  • Checkout
  • Order completion rate

Option A vs Option B

Two alternatives; neither is the incumbent.

Changed
Options
Page
Checkout
Difference
changed

Hypothesis

A multi-step flow may make progress easier to follow while adding more points where shoppers can leave. Compare completed orders and review results by device and cart value at checkout start.

How to run this test

Primary metric

Order completion rate

Compare completed orders among visitors who start checkout.

Other metrics

  • Step abandonment rateIdentify the checkout step where visitors leave.
  • Checkout completion timeMeasure time from checkout start to order confirmation consistently in both arms.
  • Form error rateCheck whether errors increase in the single-page layout even though fields and validation rules are unchanged.
  • Checkout-related support contactsCompare checkout-related support contacts over the same period.

What to check before and during the test

  • ChangeCompare the same checkout content in a single-page flow and a multi-step flow.
  • Keep constantKeep fields, payment methods, shipping information and validation rules unchanged.
  • CompletionUse order completion rate to assess the outcome.
  • SegmentsReview device and cart value at checkout start; do not segment on final cart value, which the test may affect.
  • Separate testsTest collapsible sections or a progress indicator separately.

Setup mistakes to avoid

  1. 1Keep the available payment methods unchanged during the test.
  2. 2Keep the single-page layout readable; do not add progressive disclosure in this test.
  3. 3Do not remove step guidance and leave visitors unsure where they are.
  4. 4Make sure the order summary does not cover the CTA when the keyboard opens.
  5. 5Do not hide shipping costs until the final step.