Alexander Serradilha
75% of stores have mediocre mobile UX — and paid traffic picks up the bill
Baymard assessed more than 150 stores on mobile in 2026: 75% landed in mediocre and not one scored top marks. The 10 points that most hurt conversion.
What you will learn here
- Mobile is roughly three quarters of retail traffic — and it is where the market average falls short.
- The 10 points Baymard measured are interface fixes, not a redesign.
- Before you raise budget, run the ten-question check on your own store.
Baymard Institute published its 2026 mobile UX benchmark in July. The sample: more than 150 stores assessed by hand, more than 71,000 interface elements scored one by one. The result is the kind of number that reorders an e-commerce business's priorities.
75% of stores landed in the "mediocre" band. Add the next band up and 95% of stores sit between "mediocre" and "decent". A single store in the entire sample scored "good". None scored top marks.
That matters because mobile is, according to the same study, roughly three quarters of retail traffic. The arithmetic is direct: most of a Brazilian e-commerce business's media investment arrives through an interface that, on the market average, is poorly resolved.
The most common misreading
When conversion drops, the first reaction is to touch the ad. Swap the creative, change the audience, raise the budget. It is the cheapest change to make and the easiest to measure.
But the ad delivers the session. What converts the session is the store. If the problem sits in navigation, in filtering or at checkout, more budget only buys more sessions for the same leaking funnel — and CAC climbs without anything in the ad having got worse.
The 10 points Baymard measured
The study lists the best practices and the share of stores that do not apply them:
| Practice | Stores not applying it |
|---|---|
| Adaptive error messages (that say what to fix) | 93% |
| Highlighting where in the catalogue the user is | 94% |
| Showing every colour variation on the listing item | 73% |
| Displaying the applied filters in a single overview | 66% |
| Browsing reviews through customer photos | 57% |
| Address validator or lookup | 54% |
| Grouping variations of the same product into one list item | 42% |
| A "view all" option at every catalogue level | 42% |
| Autocomplete that corrects a mistyped term | 28% |
| Submit button next to the search field | 27% |
Note the pattern: almost none of this is a redesign. These are interface behaviour fixes — most of them solved in the theme, without touching the backend.
Where to start
Three of the items above concentrate the impact and are the quickest to implement:
- Adaptive error messages at checkout. 93% of stores get this wrong. A generic "invalid data" on a card or postcode field is guaranteed abandonment on a phone, where the user cannot compare fields on screen.
- Address validator. 54% do not have one. In Brazil, with postcode lookup, it is cheaper still to solve — and it cuts delivery errors, which turn into support and reshipping costs.
- Visible applied filters. 66% do not show them. In a large catalogue, a user who does not know what they are filtering goes back to the start or leaves.
What to do with this
Before the next round of budget increases, open your own store on a phone and work through the ten items in the table. Each one is a yes-or-no question. The outcome of that check usually explains more about conversion than the campaign report does.
It is exactly this cross-check — what media delivers against what the store converts — that WIG runs in the diagnosis. When the problem is the store itself, the fix lives in website development — or in building the store on Shopify, when it is worth rebuilding rather than patching.
“The ad delivers the session. What converts the session is the store.”
