By platform
Shopify Plus checkout design: what buyers hit
Your checkout looks right to you because you ordered from your own address and your usual market. Simulated buyers from other markets and payment paths show the step where each one stopped.
Which parts of Shopify Plus checkout design cost buyers?
Checkout design costs buyers most on the screens that ask for information: the address, the delivery method and the payment step. Check each path a buyer can take, which means the standard path, an express payment button and an address from another country. A simulated test runs each path and reports the screen where a buyer stopped, so you know which screen to fix first.
What this looks like in a report
“The total changed when I typed my address, and no delivery options appeared. I cannot tell if the shop does not ship here or if the form is wrong, so I am leaving.”
The fix. Check the delivery rules and the market settings for that country, then place a test order with an address there to confirm a delivery option appears. Remove or relabel any added field that asks for something the buyer cannot give, and check the total on each step.
An illustration. Run a test to see your own.See a real sample report
Your own order took the one path you already knew
A merchant tests checkout with their own address, their usual country and the payment method they keep on file. That path skips most of what a new buyer meets. A buyer from another country sees a different currency, different delivery rules and possibly duties, and an express payment button can carry them past the address form to a screen you have not checked. An app that adds a field to checkout can also change the order of the screens, so a path that worked last month can stop a buyer at a field you never placed.
- Place one order with an address in another country. Does every field fit that country?
- Start from an express payment button on the cart, then from the standard checkout. Do both reach the same screen?
- Read the total and the delivery line on each screen. Does the delivery choice change with the address?
- Open each field an app added. Does its label say what a buyer should type?
What the theme controls, and what checkout does not
Your theme shapes the cart and the product page, so an edit there is visible in the place you expect. Checkout is a page Shopify hosts, so its layout, its field labels and its branding come from the checkout settings, the apps you install and the countries you sell to, rather than from the theme code. A merchant who only edits the theme can finish a redesign and still find the checkout unchanged, or changed in a way they never reviewed. Check the checkout directly, and do not assume the theme work carried over.
Express buttons skip the screens you test
Express payment buttons on the product or cart page can take a buyer through a different path, sometimes with an address already saved in their wallet. The buyer may never see the address form you spent time on. If the express path reaches a screen the standard path never shows, such as a delivery choice you did not expect, that is a real stop for the buyer who chose it. Run both paths and compare the screens they reach, rather than assuming one stands in for the other.
Another market changes the screens after the address
A buyer in another country meets the store's rules for that country. The currency can change, the delivery options can be different or missing, and duties or taxes can appear on the payment screen as a line the buyer did not expect. Each of these is a setting in the store, not a bug in the form, so the fix is to find the rule for that country. Place one order from that country with a typed address, and read the total at the address, the delivery and the payment screens.
Each app that adds a field moves the stops
An app that adds a field, a checkbox or a note to checkout can change the order of the screens and how long the form runs. A field with a label written for the merchant, such as an internal code, can stop a buyer who has no code to give. Keep a list of every app that touches checkout, and after each install, run the standard path once more and read every new field as a buyer who has never heard of the app.
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What you get with Mimiq
- 01
Run it by hand, or on every pull request
Paste a link and a task in the app and watch the visitors work. Or run them on every preview deploy: the GitHub Action comments on the pull request, any other CI can call the MCP endpoint, and your coding agent can run it too.
- 02
Bugs and usability problems in one report
The browser records errors and failed or slow requests on the step they happened. The visitors say where the wording or the steps confused them, and where they left.
- 03
Visitors that behave like your audience
Each visitor is a different profile with a reason to be there, matched to who the page is for, described by you, or built from your own customers.
- 04
A prompt to fix each problem
Every problem comes with a fix to paste into Cursor, Claude Code, Lovable or any coding agent, and one prompt hands over the top problems at once. Then send the same visitors through again.
- 05
Follow every visitor
See each visitor's whole path, step by step with screenshots, and what it was thinking at every step. Ask any visitor a question.
The browser records relevant JavaScript errors and failed or slow app requests encountered during the run, attached to the step where they occurred. The visitors are simulated: they find problems, they do not predict how many real people will convert.
A new country or app next quarter can move the stop to another screen
A new shipping zone, a currency or an app that adds a checkout field changes the screens a buyer meets and the order they meet them in. After each of those changes, place one order from another country through the standard path, then once through an express button. Keep the screenshots, so a stop that moved is easy to spot.
Starter
Try it on one launch
About 4 tests of 5 visitors
- Visitors on your landing page, signup and checkout
- Where they left and why, with a fix to copy for each problem
- Run it in the app or on every pull request
- Ask any visitor a question, included
- Test accounts and protected previews
Builder
Test every build
About 20 tests of 5 visitors
- Everything in Starter
- Credits refill each month, and what is left rolls over once
- Cancel anytime
Pro
Test every release, as a team
About 60 tests of 5 visitors
- Everything in Starter
- Credits refill each month, and what is left rolls over once
- Cancel anytime
Scale
Test at scale, every day
About 240 tests of 5 visitors
- Everything in Starter
- Credits refill each month, and what is left rolls over once
- Priority support
- Cancel anytime
Questions
Can a simulated buyer complete a Shopify order?
No. The run stops at the payment step, because a simulated buyer cannot pay with a real card. It shows the total and the payment options on that screen. It does not show whether a particular payment succeeds.
Will this show whether I should sell in a new country?
No. It does not predict demand in any country. It shows whether a buyer from one country can reach the payment step with the delivery and total you set. Demand comes from your own sales and traffic data.
Does a run cover every app installed on my store?
Only the screens it reaches. An app that appears only for certain carts, customers or markets will not show up unless the run reaches that case, so set up each case you care about before you run it.
Should I test checkout after a theme update?
Yes. The cart and product page change with the theme, and an update can move the add-to-cart step or the express button. Run the standard path and the express path once each, from a phone, and compare the screens with your last run.
Can the run tell me which setting to change?
It can show the screen, the field and the message where a buyer stopped. The setting is yours to find, because the same screen can be controlled by a shipping rule, a country setting or an app.
Keep reading
Send visitors and see what breaks first.
Your first test is free: sign in with Google and it starts right away. Last checked 2026-11-02.