Sticky checkout button with order total: +9.98% purchases
Commentary byLiftArchiveOur analysis, not theirsA sticky checkout button showing the order total, plus a collapsed order summary, lifted purchase conversions by 9.98% on mobile for ethnic fashion store Utsav Fashion.
Wingify Services ran this A/B test, published as a VWO case study.
Three changes shipped together, so the result belongs to the set, not to the sticky button alone.
- Purchase conversions: +9.98%.
- Revenue: +8.95%, slightly less than the conversion lift.
The change
A sticky button with the total replaces the hidden one; the summary collapses.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
The mobile checkout had no primary button in view while shoppers filled in the form. The order summary sat in the page with an Edit link, and shoppers interacted with it a lot.
Variant
A button stuck to the bottom of the screen and showed the order total. The order summary was hidden behind a View Details link, and the Edit option was removed.
Why it likely won
Our reading of the result, not the practitioner's claim.
- US mobile visitors were abandoning the cart at a 67% rate. A button always in view made finishing the order the obvious next step.
- Showing the total on the button kept the cost visible without a full summary in the way.
- Removing Edit cut the chance that shoppers would go back and rethink their carts mid-checkout.
Caveats: Three changes were bundled, so none can be credited alone. The test ran for 16 days on US mobile traffic; sample size and significance were not shared, and the data dates from around 2020.
Who ran it
VWO ran this test for Utsav Fashion and published the results (VWO case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on VWO →
How to run this test on your store
- Hypothesis
- If we add a sticky checkout button with the order total and collapse the order summary, then more mobile shoppers will finish checkout because the next step is always visible and distractions are fewer.
- Primary metric
- Checkout completion rate
- Guardrails
- Revenue per visitor
- Average order value
- Customer service contacts about orders
- Who should test it
- Stores with long mobile checkout forms where the main button scrolls out of view. Removing the Edit option may frustrate shoppers who need to fix their cart, so watch support contacts and consider keeping an easy way back.
Questions
Should a mobile checkout button be sticky?
It is worth testing on long forms where the button scrolls out of view.
Utsav Fashion saw purchases rise after making it sticky, along with other changes.
Should I show the order total on the checkout button?
It keeps the cost clear without a full summary taking up space.
Shoppers know what they will pay before they tap.
Should I collapse the order summary on mobile checkout?
Collapsing it saves space and keeps focus on the form.
Keep it one tap away so shoppers can still check their order.
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