Sticky add-to-cart bar on desktop: +25.95% conversion rate
Test run byBlend CommerceCRO agency
Commentary byLiftArchiveOur analysis, not theirsAdding 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%.
- 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%.
The change
The variant adds a sticky add-to-cart bar that stays on screen on desktop.
Simplified mockup drawn by LiftArchive from the shared screenshots.
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 of the result, not the practitioner's claim.
- 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.
Who ran it
Blend Commerce ran this test for PerTronix and published the results (Blend Commerce A/B test). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Blend Commerce →
How to run this test on your store
- 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
- Guardrails
- Average order value
- Return rate
- 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.
Questions
Does a sticky add to cart work on desktop?
It did for PerTronix, lifting conversion rate by 25.95%.
The gain is likely larger on long pages where the main button scrolls away.
Can a sticky add to cart lower order value?
Not here. Average order value rose 6.3% and products per visitor 18.69%.
What should a sticky add-to-cart bar show?
At least the buy button. Many also show the product name, price and selected option so shoppers can confirm before adding.
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