Checkout: Sticky Call To Action
Hypothesis
If we implement Sticky Call To Action on checkout pages, then conversion rate will improve because this is a repeatedly validated UX pattern.
Test Results
Key Learning
Problem: Key actions on the checkout disappear as users scroll, creating a gap between intent and the ability to act.
What worked: has been validated across multiple real A/B tests. The evidence (3.0) suggests it is Very Likely better. Use this as a high-priority test hypothesis backed by industry meta-analysis. (+4.0% lift)
Takeaway: Even small lifts compound — across thousands of sessions, this adds up. CTA changes are fast to iterate — test variations of copy, color, size, and placement independently to maximize this.
How to Apply This to Your Site
This experiment demonstrated that checkout: sticky call to action can produce a +4.0% improvement in conversions. The test was run on a checkout page in the cross-industry industry.
Before you test: Consider that cta tests typically require adequate traffic to reach statistical significance. Run your test for at least 2 full business cycles to account for weekly traffic patterns.
What Was Tested
Testing whether Sticky Call To Action improves conversion performance. Based on 3.0 evidence points, version B is Very Likely better. Applicable to checkout, content, global, home-landing, listing, product, shopping-cart page types.
Methodology
Build On These Learnings
Save your own experiments, spot winning patterns across your test history, and stop repeating what's already been tried.
Related Experiments
Listing: Visible Payment Options
Context: The primary call-to-action on the listing isn't converting at its potential — design, copy, or placement may be the bottleneck.
Product: Single Or Alternative Buttons
Context: The primary call-to-action on the product isn't converting at its potential — design, copy, or placement may be the bottleneck.
Listing: Filled Or Ghost Buttons
Context: The primary call-to-action on the listing isn't converting at its potential — design, copy, or placement may be the bottleneck.
Checkout: Above The Fold Call To Action
Context: The first screen of the checkout must immediately communicate value — if it doesn't, users bounce before scrolling.