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Do styling A/B tests work in Professional Services?

In line with both baselines. Styling tests win 12% in Professional Services, against 15% for styling tests generally and 14% for Professional Services generally. Neither the category nor the vertical is moving this much.

The strongest change type we can measure in Professional Services is Layout at 25% on 32 tests tests.

The numbers

Professional Servicesall industries
Tests analysed100+1,000+
Beat control12%15%
No measurable difference78%
Lost to control10%
Median lift when it won +16.5%

Median traffic per variant was 1557 visitors. Most ran on homepages (107), category pages (12), product pages (10).

Every change type we can measure in Professional Services

change typewin rate in Professional Servicestests
Layout 25%32 tests
Headline 13%50+
Styling (this page) 12%100+
Split URL 12%50+
Body copy 11%36 tests

The industry overview is at Professional Services benchmarks; rates across all industries are on the styling benchmark.

What counts as a styling test

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.

Control and variant wireframe for a styling A/B test
Control on the left, variant on the right. Only the changed element is highlighted.

Styling tests that won in Professional Services

  • Adjusts hero H1 spacing/size and restyles the trust row, replacing award badge images with a star-rating/review-count badge (visual/layout change, no wording change).
  • Adjusts mobile spacing/padding on hero section and headline and reorders hero elements (headline, CTA, image, link box) without changing any text
  • Changes the CTA text color to blue (#3155A4) without altering wording
  • On mobile, reorders two child divs within a container and adjusts top padding, without changing any text

Styling tests that did not

  • changes the CTA text color to blue, no text change
  • Changes the text color of a footer navigation link to blue
  • Hides the second widget div on the page

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.

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.