# Image carousel and sticky Add to Cart on mobile: +9.78% cart clicks

- Outcome: Won
- Page type: Product page (Ecommerce)
- Elements: Product images & gallery, Sticky add-to-cart bars
- Test run by: [VWO](https://liftarchive.com/practitioners/vwo/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://wingify.com/success-stories/panduro/
- Page: https://liftarchive.com/test/panduro-mobile-pdp-carousel-sticky-atc/

Adding a swipeable image carousel and a sticky Add to Cart bar to mobile product pages raised Add to Cart clicks by 9.78% and ecommerce conversion rate by 1.68%. Wingify Services ran this 10-day test for Panduro, a hobby and craft retailer, and it was published as a VWO case study. The two changes shipped together, so the lift can't be credited to either one alone.

## Result

**+9.78% cart clicks**

- Add to Cart clicks: +9.78%, counting both the main and the sticky button.
- Ecommerce conversion rate: +1.68%.
- Variant 1 was rolled out to all traffic. Results for variant 2 were not shared.
- No confidence level was reported for either figure.

## Control

Shoppers had to tap each thumbnail to see more product images, as there was no carousel. The page was long, with product recommendations, so the Add to Cart button scrolled out of view.

## Variant

Images became a swipeable carousel, and a sticky Add to Cart bar appeared at the bottom whenever the main button was off screen. A second variant also showed savings in currency and a shortened description; the first variant won.

## Why it likely won (our reading)

- Click maps showed images got 60% of clicks on the page, so making them easier to browse met a clear need.
- A sticky button keeps the buying action in reach on a long page.
- Extra elements in variant 2, like savings and a cut description, may have added clutter without helping.

## Caveats

The carousel and sticky button were tested together, so their separate effects are unknown. The test ran 10 days with no sample size or significance shared, and the result is vendor-reported.

## How to run this test

- Hypothesis: If we add a swipeable image carousel and a sticky Add to Cart bar on mobile product pages, then more shoppers will add to cart because images are easier to browse and the button never leaves view.
- Primary metric: Mobile ecommerce conversion rate
- Guardrail: Add to Cart clicks
- Guardrail: Returns or cart removals
- Guardrail: Page load time
- Who should test it: Stores with long mobile product pages and several images per product. If your buy button already sits near the top of a short page, a sticky bar will add less.

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Credit: VWO ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/panduro-mobile-pdp-carousel-sticky-atc/).
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.