Sticky add-to-cart button on mobile: +5.1% revenue per visitor
Commentary byLiftArchiveOur analysis, not theirsAdding a sticky add-to-cart button to mobile product pages raised mobile revenue per visitor by 5.1% for the skincare brand Ursa Major.
The agency UN/COMMON ran the test, and it was published as a Shoplift case study.
The result reached statistical significance, and Ursa Major rolled it out site-wide.
- Mobile revenue per visitor: +5.1%, statistically significant.
- The team then shipped the sticky button across the site.
- No sample size, duration or desktop result was shared.
The change
The variant adds a sticky add-to-cart bar on mobile.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
Mobile product pages had an add-to-cart button only in its normal spot near the top of the page.
Variant
A sticky add-to-cart button stayed on screen as mobile shoppers scrolled the product page.
Why it likely won
Our reading of the result, not the practitioner's claim.
- On mobile, the main button scrolls out of view quickly. A sticky button means shoppers never have to scroll back up to buy.
- Skincare pages tend to be long, with ingredients and reviews, so many shoppers read far down the page.
- The button is a steady reminder that buying is one tap away.
Caveats: No sample size, duration or confidence level beyond 'statistically significant' was published.
Who ran it
UN/COMMON ran this test for Ursa Major and published the results (Shoplift case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on UN/COMMON →
How to run this test on your store
- Hypothesis
- If we keep an add-to-cart button fixed on screen on mobile product pages, then revenue per visitor will rise because shoppers can buy at any point while scrolling.
- Primary metric
- Mobile revenue per visitor
- Guardrails
- Mobile add-to-cart rate
- Return rate
- Page speed on mobile
- Who should test it
- Stores with long mobile product pages and mostly mobile traffic. It matters less if your pages are short and the main button is always close by.
Questions
Does a sticky add-to-cart button help on mobile?
It did for Ursa Major, raising mobile revenue per visitor 5.1%. Results vary with page length and design.
Should a sticky add-to-cart show on desktop too?
This test only covered mobile. Desktop screens show more at once, so test it there separately.
What should a sticky add-to-cart include?
The source does not describe its design. A clear button, and often the price or variant, is a common starting point.
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