Talk to a humanAFTCO tested a sticky mobile add to cart button to increase add-to-cart rates. Learn how this change impacted user behavior.
Sticky Mobile Add-To-Cart Button
Goal
Add-to-cart rate
Result
+3.9% Add-to-cart rate
Category
Product Page (PDP)
Outcome
Winner
Before
After
If a persistent Add to Cart button is shown, then the add-to-cart rate will increase because users won’t need to scroll back up after reading long-form content.
What We Changed
- Made the add-to-cart button sticky on mobile.
- Added price to the button.
- Included a small cart icon on the button.
The Results
How the new version compared with the original, across all devices.
+6.2%
Lift in conversion rate
+4.4%
Orders
+3.9%
Add-to-cart rate change
Key Learnings
- Persistent CTA increased visibility and accessibility.
- Showing price on the button reduced decision friction.
- Visual icon provided clear, instant action guidance.
- Simplified access enhanced mobile user experience.
Detailed results breakdown
Add-to-cart rate change
+3.9%
Average order value
-2.5%
Click-through rate change
+0.8%
Lift in conversion rate
+6.2%
Change in revenue per visitor
+3.6%
Free Trial
Start with 3 experiments.
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Get a taste of our service. We'll analyze your store, pinpoint low-hanging fruit, design, implement and test solutions to lift your conversion rate in 30 days.
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?
The best proof is results. Three real experiments show you exactly how we work and whether it drives revenue for your specific store. You keep everything - no strings attached.
Our bet
We're confident enough in our process to invest our time upfront. If the tests work, you'll see the value in continuing at $5,950/month. If not, you got free optimization work.
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Other experiments we've run
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Positive signal
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+18.99% (CTR) CTR
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
Cart
Positive signal
A Cart Scarcity Message Shows a 2.7% Conversion Rate Lift
The cart told shoppers their items were in high demand and couldn't be reserved. See how that urgency affected checkout over 18 days.
+2.7% Conversion rate