# Making One Service Icon Larger: Mobile App A/B Test

Page: https://alidemirbas.com.tr/en/lab/ab-test-library/tests/making-one-service-icon-larger-mobile-app-ab-test

## Hypothesis

If the priority service's icon is larger than the others, it may be the first thing visitors notice on the mobile screen and the easiest one to head for. The featured service completion rate could rise as a result, though attention may shift away from the other services.

## When to run this test

A heatmap with clicks scattered across equal-size icons is the first clue that the priority service gets lost on mobile; visitors reaching its target page through search or long detours, and support requests from people who could not find it, back that up. If the larger icon draws the eye, visitors reach the priority service in fewer steps and finish what they start there. If visitors find the service but drop out partway, the problem is the service flow rather than the icon, so look there first; and set the enlargement so the icon never starts to look like a banner.

## Primary metric

**Featured service completion rate**: Compare completed actions for the featured service per assigned visitor.

## Other metrics

- **Icon click-through rate (CTR)**: Check whether a larger icon receives more clicks.
- **Category entry rate**: Measure visits to the service's target page.
- **Clicks on other services**: Make sure other services are not overshadowed.
- **Navigation efficiency**: Check whether visitors reach the target page in fewer steps.

## What to check before and during the test

- **Size**: Increase one predefined service icon by a fixed amount.
- **Appearance**: Keep color, position, label and destination unchanged.
- **Other services**: Do not change other icons or access paths.
- **Placement**: A different order or screen position requires a separate test.
- **Selection**: Do not change the featured service or add another service during the test.

## What to watch when reading the result

- A lift in icon clicks is not a win on its own. The featured service completion rate should make the call; if clicks rise while completions stay flat, the larger icon may only be drawing curiosity.
- Read clicks on other services and category entries together: if the featured service gains while access to other categories slips, the larger icon is overshadowing them. In that case, revisit the enlargement and whether the icon reads as a banner before you ship.
- This result covers only this service, this enlargement and this mobile layout. Featuring a different service, or changing the icon order or screen position, calls for a separate test.
- A longer run may be needed when no clear gap shows, because completed service actions are rarer than icon clicks. Enter the current featured service completion rate into the [sample size calculator](https://alidemirbas.com.tr/en/calculators/sample-size-calculator) to get the sample per variant, divide it by daily visitors per arm to set the run length up front, and do not decide before it is over.

## Frequently Asked Questions

### Does more icon clicking make the variant a winner?

Use completion of the promoted service action as the primary outcome. More clicks without completion do not establish additional successful use.

### Can a larger icon harm other services?

Yes. Attention can shift away from other paths. Monitor their access and actions, and avoid making the icon dominate the page like an unrelated banner.