Mobile checkout testing,
for the breaks desktop tests miss.
Many shoppers buy on their phones, and a checkout can break on a phone while it still works on desktop. Tracefox replays your checkout on a schedule with mobile device emulation in Chromium (Pro and Business), so a mobile-only break shows up on the next scheduled run.
Test your mobile checkout freeWhy mobile checkout breaks more often
Mobile abandonment runs higher than desktop (85% vs 73% per Statista 2024, see our cart abandonment statistics). Part of that gap is behavioral (mobile shoppers are often in research mode). Part of it can be technical: mobile browsers handle JavaScript, cookies, and security policies differently, and many stores don't test the mobile flow with the same rigor as desktop.
Common silent mobile checkout failures. Some can be caught by a scheduled mobile-emulated test; ones rooted in Safari's own engine need a real Safari check, and each card says which.
Payment form fails to render on a phone
A theme update changes script loading order, or a payment SDK update interacts badly with Safari ITP. Mobile customers see a blank payment section, abandon. Desktop is fine, your dashboard shows nothing wrong. A mobile-emulated test can catch the script-ordering variant; a failure caused by Safari ITP itself only reproduces in real Safari.
Shop Pay / Apple Pay button disappears
Accelerated checkout buttons (Shop Pay, Apple Pay, Google Pay) are a fast path many customers rely on. When they silently stop loading on mobile, that path disappears. A scheduled test can check that the Shop Pay button renders. Apple Pay doesn't appear in Chromium, so a Tracefox test cannot confirm it: check it on a real iPhone.
Coupon input field gets hidden by mobile keyboard
A theme update changes the checkout layout. The promo code input now sits exactly where the on-screen keyboard appears, hiding it. (On-screen keyboard overlap is a real-device behaviour that emulation does not reproduce.) Customers can't see what they're typing, they give up. Desktop layout looks pristine.
Place Order button slips below the viewport
Wider fonts, different button sizes, or a new theme tweak push the Place Order button just below the visible viewport on a phone-sized screen, which a mobile-emulated test does show. Customers don't scroll, they assume checkout is broken, abandon.
3D Secure challenge doesn't complete on a phone
When a customer's bank asks for 3D Secure (common for UK and EU cards), they have to complete a challenge from their bank. If that challenge fails to open or return on a phone, the order never completes and the customer may assume their card was declined. Tracefox tests stop before payment and don't handle 3D Secure, so check this yourself on a real phone, using your payment provider's 3D Secure test cards in its test mode on a development store or a copy of your store (test mode stops real customers paying by card).
How Tracefox covers mobile checkout
Each saved test runs on one viewport you choose: desktop, mobile (375x812 phone emulation) or tablet (768x1024). Mobile and tablet are available on Pro and Business. To cover both, save the same flow twice, once on mobile and once on desktop. When the mobile test fails and the desktop one passes, you know the break is mobile-specific. All tests run in Chromium; mobile emulation is not real Safari.
- Mobile, tablet or desktop emulation, chosen per test
- A screenshot after each step at the test's viewport, so you can see how the page looked when it broke
- Pass/fail history per test, so a mobile test failing while its desktop twin passes stands out
- Email alerts on every plan, plus Slack on Pro and Business
Mobile checkout testing FAQ
Why is mobile checkout testing different from desktop?
Mobile layouts, touch input and mobile-only scripts differ from desktop, and Safari on iPhone handles cookies and cross-origin requests differently from desktop Chrome. Payment fields, Shop Pay, Apple Pay and Google Pay can all behave differently on a phone. A theme update that works on desktop can silently break the payment form on mobile, and many shoppers buy on their phones.
Can Tracefox test on real iPhone Safari?
No. Tracefox runs Chromium with mobile emulation: a phone-sized viewport (375x812), touch events, the page's mobile layout, and retina pixel density. That catches responsive layout breaks, mobile-only scripts and touch-targeted UI. It cannot catch bugs that only exist in Safari's WebKit engine, iOS-specific payment sheets such as Apple Pay, or real-device behaviour, so test on a real iPhone as well for anything Safari-specific.
Why can a checkout break in Safari on iPhone while it works elsewhere?
Safari's Intelligent Tracking Prevention (ITP), stricter SameSite cookie defaults, and tighter third-party storage restrictions mean payment SDKs and tracking scripts can need special configuration. When a theme update or plugin auto-update doesn't account for ITP's latest changes, it can break in Safari while other browsers still work.
What does a mobile-only checkout bug look like?
One example: the payment form fails to render on a phone. The customer sees a blank space where the payment fields should be, taps back, abandons. This can happen after a theme update changes script loading order, or after a payment SDK update that interacts badly with Safari ITP. A desktop-only manual test won't catch it.
Catch mobile checkout breaks before they cost you peak revenue.
Save a mobile test of your checkout and Tracefox replays it on your schedule, so a mobile-only break surfaces on the next run instead of in next week's conversion report.
Test your mobile checkout free