Talk to a humanOn mobile product pages, the add-to-cart button stayed on screen instead of appearing only in one section. See what changed across 10,753 mobile visitors.
A Sticky Mobile Add-to-Cart Button Shows a 6.5% Conversion Rate Lift
Goal
Add-to-cart rate
Result
+6.5% Conversion rate
Category
Product Page (PDP)
Outcome
Positive signal
Before
After
If we add a sticky add-to-cart button on mobile product pages, then add-to-cart rate will increase because shoppers can add items without scrolling back to the button.
What We Changed
- Made the add-to-cart button sticky on mobile product pages.
- Kept it 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.
+6.5%
Conversion rate
+9.3%
Revenue per visitor
+6.0%
Orders
Key Learnings
- Conversion rate rose 6.5% and revenue per visitor 9.3% across 10,753 mobile visitors.
- Neither reached significance in 17 days, so this is a signal worth acting on, not proof.
- Add-to-cart rate, the metric the test targeted, barely moved (-0.5%), with a 46.9% probability that the variant beats the original on it.
- Shoppers didn't add to cart more often, yet more of them completed a purchase.
Detailed results breakdown
Conversion rate
+6.5%
Revenue per visitor
+9.3%
Orders
+6.0%
Add-to-cart rate
-0.5%
Average order value
+2.6%
Free Trial
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Who qualifies?
30,000+ Monthly sessions.
Minimum traffic needed to run statistically significant tests.
Running on Shopify or Shopify Plus.
Our specialty - we don't work with other platforms.
Investing in paid traffic.
We work with stores committed to growth, not hobbyists.
Ready to invest in systematic CRO.
You understand testing takes time - no magic bullets.
Why free?
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Our bet
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Other experiments we've run
Cart
Positive signal
A Decluttered Mini-Cart Shows a 7.5% Conversion Rate Lift
The mini-cart overlay was rebuilt mobile-first, with less room for promotions and more for the path to checkout. See how it changed sales across 35,480 visitors.
+7.5% Conversion rate
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