Sticky mobile add-to-cart button with price: +3.9% add-to-cart
Test run byClean CommitCRO agency
Commentary byLiftArchiveOur analysis, not theirsMaking AFTCO's mobile add-to-cart button sticky, with the price and a small cart icon on it, lifted add-to-cart rate 3.9% and conversion rate 6.2%.
Clean Commit ran this test for AFTCO, an outdoor and fishing apparel brand, and published it in its A/B test library.
Clean Commit called it a winner, but no sample size or confidence level was shared.
- Add-to-cart rate: +3.9%, the metric the test targeted.
- Conversion rate: +6.2%, and orders rose 4.4%.
- Revenue per visitor: +3.6%, even though average order value fell 2.5%.
- Click-through rate: +0.8%, a small change.
The change
The variant keeps the add-to-cart button on screen, with price and a cart icon.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
The add-to-cart button on mobile product pages stayed in place and scrolled out of view as shoppers read further down.
Variant
The button stuck to the screen on mobile, showed the product price, and had a small cart icon.
Why it likely won
Our reading of the result, not the practitioner's claim.
- Shoppers who read long product content no longer had to scroll back up to buy.
- Showing the price on the button reminds shoppers of the cost at the moment they decide.
- The cart icon makes the button's job obvious at a glance on a small screen.
Caveats: No sample size, duration or significance level was shared. Three changes shipped together (sticky, price, icon), so each one's share of the lift is unknown.
Who ran it
Clean Commit ran this test for AFTCO and published the results (Clean Commit A/B test library). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Clean Commit →
How to run this test on your store
- Hypothesis
- If we make the mobile add-to-cart button sticky and show the price on it, then more shoppers will add to cart because the button is always in reach.
- Primary metric
- Mobile add-to-cart rate
- Guardrails
- Conversion rate
- Average order value
- Revenue per visitor
- Who should test it
- Stores with long mobile product pages full of specs, reviews or stories. On short pages where the button is always visible, the gain is likely small.
Questions
Does a sticky add-to-cart button increase sales on mobile?
It did here, with conversion rate up 6.2%.
It helps most when product pages are long and the main button scrolls out of view.
Should I show the price on the add-to-cart button?
It's worth testing. It keeps the cost visible at the moment of decision, though this test bundled it with other changes.
Why did order value fall slightly?
Average order value dipped 2.5%. A faster path to cart can mean fewer add-ons, but revenue per visitor still rose 3.6%.
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