Shoppers who reach your cart have already decided to buy, so this is where small changes recover the most revenue. CustomFit tests the cart, the way into checkout, and the checkout itself, including one-click checkouts like GoKwik and Razorpay Magic Checkout, and judges every variant on completed orders.
Buy-now on the PDP against add-to-cart, and the cart drawer against the cart page.
Free-shipping progress bars, upsells, trust badges and the order of what shoppers see before paying.
Delivery dates, COD availability and prepaid incentives, shown before checkout opens.
A one-click checkout against Shopify's native checkout, and where the express-pay button sits.
Which methods appear and in what order: UPI, wallets, cards, pay later.
Checkout UI Extension blocks such as trust messages and upsells, on Plus stores.
Shopify keeps its checkout pages locked down. On every plan you can test everything that leads into checkout and which checkout shoppers use. Changing blocks inside Shopify’s own checkout pages needs Shopify Plus and Checkout UI Extensions. Most of the revenue is decided before that point anyway.
Checkouts like GoKwik and Razorpay Magic Checkout take the order out of Shopify’s native checkout, so tools that rely on Shopify’s checkout events never see the purchase. CustomFit receives orders and revenue from these checkouts directly.
Choose where carts are lost: the cart, the way into checkout, or the checkout itself.
Change it in the no-code editor, or pick the checkout each group gets.
Each shopper stays in one variant for the whole visit, through to payment.
Pick the winner on completed orders and revenue per visitor, with AOV as a guardrail.
Partly, and it depends on your plan. On every plan you can test everything that leads into checkout (the cart, the cart drawer, buy-now buttons, shipping and COD messaging) and which checkout shoppers use. Changes inside Shopify's checkout pages themselves need Shopify Plus, through Checkout UI Extensions.
Start where carts are lost: the checkout entry point (buy-now vs add-to-cart, cart drawer vs cart page), delivery and COD messaging before checkout, and, if you use one, your one-click checkout against Shopify's native checkout.
Completed orders and revenue per visitor, with AOV and margin as guardrails. Add-to-cart and checkout starts are early signals, not the verdict.
Yes. Those checkouts bypass Shopify's native checkout events, so most testing tools only see add-to-cart. CustomFit receives orders and revenue from these checkouts directly and writes the variant onto each Shopify order.
Each shopper is kept in one variant for the whole visit, so flows never mix mid-session, and you can stop a test and revert at once if completion dips.
No for cart, entry-point, messaging and checkout-choice tests, which you build in the no-code editor. Checkout UI Extension changes on Shopify Plus may need a one-time developer setup.
Related: checkout optimization playbook · cart abandonment recovery · shipping A/B testing · discount A/B testing
We’ll look at where your carts drop and set up your first checkout test on the call.