Prominent add-to-cart pop-up: +22.31% shoppers starting checkout
Commentary byLiftArchiveOur analysis, not theirsReplacing a small add-to-cart confirmation with a prominent pop-up raised the number of shoppers starting checkout by 22.31%.
Us, a Belgian marketing agency, ran this 14-day A/B test for fashion retailer e5, and it was published as a VWO case study.
Gains held through every checkout step and value per visitor rose from $1.91 to $2.32.
- Shoppers starting checkout: +22.31%.
- Move from the first checkout step to the second: +32.57%.
- Payment step completion: +19.39%.
- Expected value per visitor: $1.91 to $2.32, an increase of $0.41.
The change
A small confirmation box replaced by a prominent added-to-cart pop-up.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
After adding an item, shoppers saw only a small confirmation box. Session recordings showed many added items and then left without buying.
Variant
A prominent pop-up confirmed that the item had been added to the cart and gave a clear next step.
Why it likely won
Our reading of the result, not the practitioner's claim.
- The small box was easy to miss, so some shoppers may not have known the item was in their cart.
- A clear confirmation with a button turns the moment after adding into a prompt to check out.
- The pop-up keeps the cart contents simple, unlike a mini-cart where shoppers in a follow-up test removed more items.
Caveats: The test ran for 14 days, and no sample size or confidence level was shared. A follow-up mini-cart version raised conversion but lowered average order value, so the pop-up was kept; the best button also differed by device.
Who ran it
Us ran this test for e5 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 Us →
How to run this test on your store
- Hypothesis
- If we show a clear pop-up confirming the item was added to the cart, then more shoppers will start checkout because they know the add worked and see an obvious next step.
- Primary metric
- Share of product page visitors starting checkout
- Guardrails
- Average order value
- Items removed from cart
- Product page bounce rate
- Who should test it
- Stores whose add-to-cart feedback is subtle, like a small badge or brief notice, and whose data shows people adding but not checking out. Test the pop-up's main button by device: in this case checkout worked best on mobile and cart on desktop.
Questions
Pop-up or mini-cart after add to cart?
For e5, a mini-cart raised conversion but cut order value because shoppers removed items, so the pop-up won overall. Test both and watch order value.
Should the pop-up button go to cart or checkout?
It depended on device here. Go-to-checkout worked best on mobile, and go-to-cart worked best on desktop.
Won't a pop-up annoy shoppers?
This one appears only after a shopper chooses to add an item, so it confirms their action rather than interrupting them.
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