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Mega Menu or Simple Horizontal Menu A/B Test Example

A mega menu exposes subcategories in one panel, while a horizontal menu emphasizes top-level sections and may require another step to reach subcategories.

  • UI elements
  • Purchase conversion rate (CR)

Option A vs Option B

Two alternatives; neither is the incumbent.

Changed
Options
Page
UI elements
Difference
changed

Hypothesis

If the navigation hierarchy differs, the experiment measures all of those structural changes. Keep category destinations fixed and assess reaching them and making a purchase.

How to run this test

Primary metric

Purchase conversion rate (CR)

Compare purchases among eligible assigned visitors who encounter the navigation.

Other metrics

  • Time to reach a categoryMeasure arrival at the category, not just the first menu click.
  • Navigation stepsCount interactions required to reach a target category.
  • Bounce rateCompare exits without further interaction using one consistent definition.
  • Category page visitsCompare visits to category pages.

What to check before and during the test

  • StructureCompare a multi-column mega menu with a one-row horizontal navigation that has no mega panel; submenu interactions are a separate variable.
  • DestinationsKeep category names, order and destination pages the same.
  • TimeUse the same start and arrival events to measure navigation time.
  • Key destinationsReview access to important destinations, not total menu clicks alone.
  • MobileAnalyze only real mobile differences; exclude devices that render the same layout.

Setup mistakes to avoid

  1. 1Keep menu labels and order unchanged.
  2. 2Do not overload the mega menu with categories.
  3. 3Prevent horizontal scrolling problems in the mobile menu.
  4. 4Keep mega-menu columns easy to scan.
  5. 5Avoid animations that slow the menu.