Talk to a humanMobile product pages got a sticky add-to-cart bar with a size dropdown and a find-my-size link. See how it changed orders, add-to-cart and order value.
Sticky Add-to-Cart Bar With Size Selector Shows a 9.6% Conversion Rate Lift on Mobile
Goal
Add-to-cart rate
Result
+9.6% Conversion rate
Category
Product Page (PDP)
Outcome
Positive signal
Before
After
If we add a sticky add-to-cart bar with a size selector and a preselected size, then add-to-cart rate will increase because shoppers can buy without scrolling back up or picking a size first.
What We Changed
- Added a sticky add-to-cart bar that stays visible as shoppers scroll product pages.
- Put a size selector dropdown and a "Find my size" link inside the bar.
- Preselected a size where possible, so the add-to-cart button was always active.
The Results
How the new version compared with the original, across all devices.
+9.6%
Conversion rate
+8.3%
Orders
+2.2%
Add-to-cart rate
Key Learnings
- Conversion rate rose 9.6% and orders 8.3%, but the test didn't reach significance. Treat it as a signal, not proof.
- Add-to-cart rate, the metric the test targeted, rose 2.2%, with a 65.8% probability of beating the original.
- Bounce rate fell 10.4%, in line with key buying options staying in reach.
- Average order value fell 6.9%, so revenue per visitor rose only 2.3%.
Detailed results breakdown
Conversion rate
+9.6%
Orders
+8.3%
Add-to-cart rate
+2.2%
Revenue per visitor
+2.3%
Average order value
-6.9%
Free Trial
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30,000+ Monthly sessions.
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Running on Shopify or Shopify Plus.
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Our bet
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Other experiments we've run
Product Page (PDP)
Positive signal
A Sticky Add-to-Cart Bar After Scroll Shows a 3.7% Conversion Rate Lift
Once shoppers scrolled past the main add-to-cart button, the sticky product image turned into a sticky add-to-cart bar. See how sales moved on mobile and desktop.
+3.7% Conversion rate
Cart
Positive signal
Trust Signals on Cart Page
Adding trust signals on the cart page led to an increase in conversions. Discover how these changes impacted user behavior.
+10.97% (CVR) CVR
Product Page (PDP)
Inconclusive
A Simpler Custom Text Input on Product Pages Shows Mixed Results on Conversion and Revenue
Product pages got clearer prompts and error messages for adding custom text. Conversion rate rose, but revenue per visitor and add-to-cart rate slipped.
+4.2% Conversion rate