Talk to a humanOn mobile product pages, the add-to-cart button stayed fixed at the bottom of the screen. More shoppers added to cart, but fewer went on to buy.
A Mobile Sticky Add-to-Cart Button Shows Mixed Results on Conversion and Add-to-Cart Rate
Goal
Add-to-cart rate
Result
-7.7% Conversion rate
Category
Product Page (PDP)
Outcome
Inconclusive
Before
After
If we make the add-to-cart button sticky on mobile, then conversion rate will increase because shoppers can add items without scrolling back to find the button.
What We Changed
- Made the add-to-cart button sticky at the bottom of mobile product pages.
- Kept the button visible while shoppers scroll, instead of only in one section of the page.
The Results
How the new version compared with the original, across all devices.
-7.7%
Conversion rate
+6.8%
Add-to-cart rate
-22.1%
Revenue per visitor
Key Learnings
- Conversion rate fell 7.7% while add-to-cart rate rose 6.8%, so the button pulled the two metrics in opposite directions.
- Add-to-cart rate was the metric the test targeted, and the variant had only a 50.6% probability of beating the original on it.
- Revenue per visitor fell 22.1% as average order value dropped 15.5%, but on 7,948 mobile visitors over 15 days, nothing reached significance.
- If the pattern holds, an easier-to-reach button makes adding simpler without helping shoppers decide to buy.
Detailed results breakdown
Conversion rate
-7.7%
Add-to-cart rate
+6.8%
Revenue per visitor
-22.1%
Average order value
-15.5%
Orders
-6.1%
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Other experiments we've run
Product Page (PDP)
Positive signal
Updated Product Page Design on Desktop
The desktop product page was redesigned to improve navigation and engagement. See how the updated design lifted conversion rate by 8.5% and RPV by 17.6%.
+8.5% Conversion Rate
Cart
Inconclusive
A Free Shipping Progress Message in the Mini Cart Shows Mixed Results on Conversion and Revenue
The mini cart started showing how close shoppers were to free shipping, right above the checkout button. Fewer shoppers converted, but those who did placed bigger orders.
-5.9% Conversion rate
Collection Page (PLP)
Inconclusive
Sale Percentage on Product Cards Makes No Clear Difference to Conversion Rate
Sale items showed their percentage price reduction inline on product cards. See what changed across 8,260 visitors in 19 days.
+1.0% Conversion rate