# Sticky add-to-cart bar on desktop: +25.95% conversion rate

- Outcome: Won
- Page type: Product page (Ecommerce)
- Elements: Sticky add-to-cart bars
- Test run by: [Blend Commerce](https://liftarchive.com/practitioners/blend-commerce/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://blendcommerce.com/blogs/ab-tests-shopify/adding-a-sticky-add-to-cart-on-desktop
- Page: https://liftarchive.com/test/pertronix-desktop-sticky-atc/

Adding a persistent sticky add-to-cart bar to PerTronix's desktop product pages lifted conversion rate by 25.95%. Blend Commerce ran this A/B test for the automotive parts brand. Revenue per visitor rose 25% and total revenue 29.9%.

## Result

**+25.95% conversion rate**

- Conversion rate: +25.95%.
- Revenue per visitor: +25%. Total revenue: +29.9%.
- Add-to-cart clicks: +14.76%. Average products per visitor: +18.69%.
- Average order value: +6.3%.

## Control

Desktop product pages had a standard Add to Cart button that scrolled out of view as shoppers read down the page.

## Variant

A sticky add-to-cart bar stayed visible on desktop as shoppers scrolled through specs and install guides.

## Why it likely won (our reading)

- PerTronix shoppers read specs and installation guides before buying, so they scroll far from the original button.
- A bar that stays in view lets them buy the moment they are ready, without scrolling back up.
- User testing had already shown people noticed the button disappearing, so the fix targeted a known problem.

## Caveats

Sample size, duration and confidence were not shared.

## How to run this test

- Hypothesis: If we add a sticky add-to-cart bar on desktop product pages, then more shoppers will buy because the button stays in reach while they read long technical content.
- Primary metric: Desktop product page conversion rate
- Guardrail: Average order value
- Guardrail: Return rate
- Guardrail: Add-to-cart to checkout rate
- Who should test it: Stores with long, research-heavy product pages, such as parts, electronics or tools. Less useful if your product pages are short and the main button is always on screen.

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Credit: Blend Commerce ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/pertronix-desktop-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.