Least often of anything we track — but the wins are among the biggest. Social proof changes — reviews, ratings, logos, counts — win 9% of the time, near the bottom of the table. 79% change nothing measurable. When one does land the median moves +25.8%, which is a large effect earned rarely.
The widest gap in this benchmark between how often something is recommended and how often it works. Add social proof because it is true and useful, not because you expect a lift.
| Tests analysed | 100+ |
| Beat control | 9% |
| No measurable difference | 79% |
| Lost to control | 12% |
| Median lift when it won | +25.8% |
Typical winning range: +14.5% to +37.7% for the middle half of winners. Median traffic per variant was 2122 visitors. Most ran on homepages (61), product pages (61), other pages (18).
Testimonials, star ratings, customer logos, user counts or review snippets are added, moved or removed.
Adjacent categories, and how often they win: layout (19%), hero image (17%), styling (15%).
| page type | win rate | tests |
|---|---|---|
| homepages | 15% | 50+ |
| product pages | 8% | 50+ |
Only page types with at least 30 social proof tests appear here.
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.
Social proof competes for attention with everything else on the page rather than replacing it. Adding a block of reassurance does not remove a reason to hesitate; it hopes to outweigh one. That is a weaker mechanism than removing friction or changing what gets seen first.
| change type | win rate | tests |
|---|---|---|
| Layout | 19% | 351 |
| Hero image | 17% | 160 |
| Form | 16% | 81 |
| CTA colour | 16% | 32 |
| Styling | 15% | 1414 |
| Price framing | 13% | 117 |
| CTA copy | 12% | 315 |
| Body copy | 11% | 337 |
| Split URL | 11% | 1164 |
| Headline | 10% | 918 |
| Social proof (this page) | 9% | 196 |
No — 9% is not zero, and the winners move more than most. It is that the expectation set by how universally it is recommended is far above what it delivers.
Not answerable from this data. Both appear on both sides.
Homepages carried the most tests in this set, which reflects where people put it more than where it works.
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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