Worse here than elsewhere. Styling tests win 6% of the time on checkout pages, against 11% across all page types. The category is not the problem; this page is.
It is also the strongest change type we can measure on checkout pages — nothing else we track wins more often there.
Small sample. Few of these tests cleared the bar. The 95% interval on that win rate runs 2% to 17%, so read the figure as directional.
| checkout pages | all page types | |
|---|---|---|
| Tests analysed | 47 tests | 1,000+ |
| Beat control | 6% | 11% |
| No measurable difference | 81% | — |
| Lost to control | 13% | — |
| Median lift when it won | not reported | — |
Median traffic per variant was 1904 visitors.
| change type | win rate on checkout pages | tests |
|---|---|---|
| Styling (this page) | 6% | 47 tests |
Only change types with at least 30 tests on checkout pages appear here.
A win rate only means as much as the thing being counted, so this is what these tests were actually optimising for.
| measured outcome | share of tests |
|---|---|
| Purchase / order complete | 88% |
Outcomes below 5% of the set are not listed, so these do not sum to 100. How the outcome was measured moves the win rate a lot — see the methodology.
These rates are not like-for-like. How often a test wins depends partly on what it chose to measure: a goal that records a soft signal — a click, a scroll — clears the bar more often than one that records a purchase. Across this data, tests measured against a proxy goal win 13%, against 9% for tests measured against a business outcome.
Categories differ a lot in that mix — proxy goals account for anywhere from 2% to 41% of a category's tests.
Hold the metric fixed and the spread narrows sharply. Comparing only tests measured against a business outcome, the gap between the highest and lowest category falls from 9 points to 6 — at which point the intervals overlap and the categories are not statistically distinguishable.
So read the table as a description of what happened, not as a ranking of what works. If you want the comparison to mean something, compare categories that were measured the same way. The methodology page has the full breakdown.
Visual treatment shifts — spacing, weight, borders, colour, shadows — with the same content in the same order. Move the content and it is a layout test. Rewrite it and it is a copy test.
It hid one test class, showed another, widened the basket block, and centered a static-block widget with a flex layout.
The bump-stl element was hidden before and was changed to display as a block.
The payment note text kept the same wording but had its font size, color, spacing, and line height adjusted.
A basket icon was added to the checkout progress bar step and an arrow icon to the discount block, while the discount section was made collapsible by default and the cart totals and progress bar were restyled.
The loading spinner was hidden, and the next-step button faded in so it became visible and clickable.
The loading spinner was hidden, and the existing next-step button was faded in and enabled.
These are individual tests, not rules. Each ran on one site, with one audience, against one page we are not showing you. They are picked to be illustrative rather than sampled at random, and a change that won here can lose on your page for reasons none of this captures. Read them as prompts for what to test, not as findings to copy.
This is every Mida account that ran a readable test — in-house marketers, founders, product teams, and agencies working on client sites. Nothing here is filtered by who ran the experiment or how experienced they are.
Low win rates are normal in experimentation, including at the top end. Microsoft's experimentation team, reporting on its own platform, found that only about one third of ideas improve the metric they were designed to improve — and that roughly another third actively hurt it. That is a dedicated experimentation organisation with research, prioritisation and review behind every test.
A mixed population like this one runs below that. The gap is roughly what disciplined practice buys you: ideas grounded in research rather than opinion, one variable at a time, and tests built so the result can actually be read.
So treat these as a general base rate, not a target. If you would rather not close that gap the slow way, find a CRO agency in the United States, the United Kingdom, the Netherlands or Australia — or browse every region.
A win is a variant that beat its control on that test's primary goal with a statistically significant result. Tests that never got enough traffic to say anything either way are excluded. The methodology has the full detail, including what these numbers cannot tell you.
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