Cart drawer instead of add-to-cart banner: +16% conversion rate
Test run byConvertiblesCRO agency
Commentary byLiftArchiveOur analysis, not theirsReplacing a theme's add-to-cart notification banner with a full cart drawer lifted conversion rate from 0.382% to 0.444% (+16%) and revenue per visitor by 18%.
Convertibles ran this test for a high-ticket equipment brand with an average order value of about $700. The drawer was a bundle of four changes shipped together, and the result did not reach 95% confidence.
- Conversion rate: 0.382% to 0.444%, a 16% lift.
- Revenue per visitor: +18%. Average order value was flat overall (+1%).
- Probability to beat control was 86-92%, below the usual 95% bar, so treat this as directional.
- Mobile: conversion +26% but average order value -21%, so mobile revenue per visitor was flat.
- Desktop: conversion +6%, average order value +33% and revenue per visitor +41%, on only 78 orders.
The change
A brief add-to-cart banner is replaced by a full cart drawer with shipping bar, savings and trust signals.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
Adding an item showed the theme's default notification banner, which confirmed the item and then went away. Shoppers checked out from the separate cart page.
Variant
Adding an item opened a full cart drawer (full-screen on mobile) with editable items and a direct checkout button. It also had a $100 free shipping progress bar, savings shown per item, and three trust signals for service, warranty and after-sales support. No product recommendations were added.
Why it likely won
Our reading of the result, not the practitioner's claim.
- On mobile, the drawer removed the trip to the cart page. More people bought, but that trip may have been where they added more items.
- On desktop, the free shipping bar and savings display likely gave shoppers a reason to add items. The agency suspects the shipping bar most but could not isolate it.
- Even on a store where people buy one costly item, seeing the cart total and a shipping threshold seems to change basket size.
Caveats: Four changes were bundled, so the test can't say which one drove the lift. It ran 6 weeks on 84,005 visitors but only 347 orders, below 95% confidence, and the device splits rest on 109 and 78 orders.
Who ran it
Convertibles ran this test for a high-ticket equipment brand (~$700 AOV) and published the results (Convertibles case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Convertibles →
How to run this test on your store
- Hypothesis
- If we replace the add-to-cart banner with a cart drawer that shows the cart, a free shipping bar and a direct checkout button, then revenue per visitor will rise because shoppers see their total and have a reason to add more.
- Primary metric
- Revenue per visitor
- Guardrails
- Average order value by device
- Conversion rate by device
- Cart page clicks on recommendations
- Who should test it
- Stores still using a theme's add-to-cart banner, especially with desktop traffic and a free shipping threshold. If your cart page already converts well or sells add-ons, skipping it may cost you order value.
Questions
Is a cart drawer better than an add-to-cart notification?
Not always. Here it raised conversion 16%, but on mobile it shrank order value, so revenue per visitor there was flat.
Test it and watch order value by device.
Do cart drawers work for high-ticket stores?
In this test the gain came mostly from desktop, where order value rose 33%.
A free shipping threshold is easy to pass when items are expensive, which may encourage add-ons.
How long should a cart test run on a low-conversion store?
Plan around orders, not visitors. This test had 84,005 visitors but 347 orders after six weeks and still fell short of 95% confidence.
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