Sticky Add to Cart bar on product pages: +47.6% conversion
Test run byBlend CommerceCRO agency
Commentary byLiftArchiveOur analysis, not theirsA sticky Add to Cart bar on product pages lifted conversion rate by 47.61% for Jackson's.
Blend Commerce ran this A/B/C test, which also tried a sticky bar promoting 10% Subscribe & Save.
Both beat the control, but the plain Add to Cart bar won.
- Variant 1 (Add to Cart): conversion rate +47.61% and revenue per visitor +48.28%.
- Variant 1: average products per visitor +47.10%, with a slight fall in bounce rate (-0.41%).
- Variant 2 (Subscribe & Save): conversion rate +28.56% and revenue per visitor +31.36%, weaker than Variant 1.
- Variant 1 was made the default sticky bar.
The change
A sticky Add to Cart bar stays on screen while shoppers scroll.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
Shoppers had to scroll back up or down the product page to reach the buy button.
Variant
Variant 1 added a sticky Add to Cart bar for one-time purchase that stayed on screen while scrolling. Variant 2 used the same bar but promoted a 10% Subscribe & Save offer.
Why it likely won
Our reading of the result, not the practitioner's claim.
- A buy button that never leaves the screen removes the scroll back to act once a shopper has decided.
- A one-time purchase is a smaller commitment than a subscription, so more shoppers were ready to click it.
- The subscription bar asked shoppers to make an extra choice about repeat orders, which may have slowed some down.
Caveats: No significance level, sample size or duration was shared. Lifts this large are unusual and may shrink over time.
Who ran it
Blend Commerce ran this test for Jackson's 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 to product pages, then conversion will rise because the buy action is always in reach.
- Primary metric
- Conversion rate
- Guardrails
- Revenue per visitor
- Subscription share of orders
- Mobile bounce rate
- Who should test it
- Stores with long product pages where the buy button scrolls out of view. If your pages are short or already have a sticky button, expect less.
Questions
Does a sticky add-to-cart bar increase sales?
It often helps on long product pages. In this test it lifted conversion by 47.61%.
Should a sticky bar push subscriptions or one-time purchase?
Here the one-time Add to Cart bar beat the Subscribe & Save bar on conversion and revenue.
Subscription-first stores may still want to test both.
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