# Sticky add-to-cart button on mobile: +5.1% revenue per visitor

- Outcome: Won
- Page type: Product page (Ecommerce)
- Elements: Sticky add-to-cart bars
- Test run by: [UN/COMMON](https://liftarchive.com/practitioners/un-common/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://www.shoplift.ai/case-studies/ursa-major
- Page: https://liftarchive.com/test/ursa-major-mobile-sticky-add-to-cart/

Adding 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.

## Result

**+5.1% revenue per visitor**

- 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.

## 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)

- 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.

## How to run this test

- 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
- Guardrail: Mobile add-to-cart rate
- Guardrail: Return rate
- Guardrail: 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.

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Credit: UN/COMMON ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/ursa-major-mobile-sticky-add-to-cart/).
Usage: Free to use, quote and build on, with credit and a link: name the practitioner or organization that ran the test and link to its LiftArchive page. The results belong to the practitioners who ran and shared them; the summaries and commentary are LiftArchive's.