Do social proof A/B tests work in E-commerce?

In line with both baselines. Social proof tests win 8% in E-commerce, against 9% for social proof tests generally and 14% for E-commerce generally. Neither the category nor the vertical is moving this much.

The strongest change type we can measure in E-commerce is CTA copy at 17% on 50+ tests.

Small winner set. Few of these tests cleared the bar. The 95% interval on that win rate runs 4% to 16%, so read the figure as directional.

The numbers

	E-commerce	all industries
Tests analysed	50+	100+
Beat control	8%	9%
No measurable difference	80%	—
Lost to control	12%	—
Median lift when it won	not reported	—

Median traffic per variant was 3998 visitors. Most ran on product pages (40), homepages (23), other pages (14).

Every change type we can measure in E-commerce

change type	win rate in E-commerce	tests
CTA copy	17%	50+
Layout	16%	100+
Styling	16%	500+
Hero image	15%	50+
Body copy	14%	100+
Price framing	12%	50+
Split URL	11%	250+
Headline	8%	100+
Social proof (this page)	8%	50+

The industry overview is at E-commerce benchmarks; rates across all industries are on the social proof benchmark.

What counts as a social proof test

Testimonials, star ratings, customer logos, user counts or review snippets are added, moved or removed.

Control on the left, variant on the right. Only the changed element is highlighted.

Social proof tests that won in E-commerce

Replaces the taking capsules info block with a subscription benefits list when one-time purchase is selected, restoring original content when subscription is chosen
Adds a new USP list block with icons and text (e.g. shipping/returns/guarantee) below existing content
Inserts a new Klarna buy now pay later USP message with checkmark icon above the app button
Reorders accordion groups, expands the second group by default, and adds a new Trustpilot rating list item to it

Social proof tests that did not

Inserts a new green in-stock/ships-today status message below the purchase options label
scarcity message stating the item is almost sold out with only a few remaining
Hides existing star rating/trust badge and inserts a new trust badge image with review score above the product gallery

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.

Who ran these tests

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.