Shorter product gallery on mobile: +24% conversion, not significant
Test run byClean CommitCRO agency
Commentary byLiftArchiveOur analysis, not theirsShrinking the product image gallery so the title, price and add-to-cart button showed on the first mobile screen lifted conversion rate by 24.0%, but the test did not reach significance.
Clean Commit ran this test for an anonymized Shopify store and published it in its A/B test library.
The agency labels it a positive signal; we count it as inconclusive because of low power and a small sample.
- Conversion rate: +24.0%, with a 95.3% probability of beating the original across 4,788 visitors. Not statistically significant at 23% power.
- Add-to-cart rate: +15.0%, and orders +25.5%.
- Mobile only: conversion rate +11.2% and bounce rate -11.5%, a steadier but smaller gain.
- Revenue per visitor: +62.9%, but this leans on 586 desktop visitors and is not reliable.
The change
A shorter gallery brings title, price and add-to-cart into the first mobile screen.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
A tall product image gallery that pushed the title, price and add-to-cart button below the first screen on mobile.
Variant
A shorter, tighter gallery with the same zoom, swipe and lightbox features and image shape, so key purchase details appeared on the first screen.
Why it likely came out this way
Our reading of the result, not the practitioner's claim.
- Seeing price and the add-to-cart button without scrolling makes the next step obvious.
- Keeping zoom and swipe meant shoppers lost no way to inspect the product.
- The size of the lift is likely inflated by the small sample; the mobile figure of +11.2% may be closer to reality.
Caveats: Underpowered: 4,788 visitors at 23% power, so the result is a signal, not proof. The revenue lift relies on 586 desktop visitors, and duration was not shared.
Who ran it
Clean Commit ran this test for a Shopify store (anonymized) and published the results (Clean Commit A/B test library). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Clean Commit →
How to run this test on your store
- Hypothesis
- If we reduce the height of the product gallery on mobile, then conversion rate will rise because title, price and add-to-cart appear on the first screen and shoppers scroll less before deciding.
- Primary metric
- Mobile conversion rate
- Guardrails
- Add-to-cart rate
- Image interactions such as swipe and zoom
- Revenue per visitor
- Who should test it
- Mobile-heavy stores whose product gallery fills the first screen. If your price and button already show above the fold, there is little to gain; products that sell on detailed visuals may need the larger images.
Questions
Should the add-to-cart button be visible without scrolling on mobile?
Many stores test this. Here, a shorter gallery that brought the button onto the first screen showed a 24.0% conversion lift, though it was not significant.
Will smaller product images hurt sales?
Not in this test, where zoom, swipe and the lightbox were kept.
Removing those tools would be a different change.
Why is a 95.3% probability not counted as a win?
The test had only 23% power and 4,788 visitors, so large lifts like this are often overstated. The agency itself calls it directional.
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