Data Study · CRO

    Only 3.2% of Websites Run an A/B Testing Tool on Their Homepage

    Matt SuffolettoWritten by Matt Suffoletto
    Published Sept. 24, 2026 4 min read
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    Only 3.2% of websites, 502,427 in all, load an A/B testing tool on their homepage, fewer than one in thirty. Adoption peaks at 8.2% among websites ranked 1,000 to 10,000 by popularity, and falls to 4.9% among the 1,000 most visited websites.

    Analysis of 15,470,478 website homepages · the public HTTP Archive crawl and Google's Chrome UX Report, September 2026

    Key Findings

    1. 1.Only 3.2% of websites, 502,427 in all, run an A/B testing tool on their homepage, fewer than one website in thirty.
    2. 2.A/B testing tools peak at 8.2% of websites ranked 1,000 to 10,000 by popularity, against 4.9% of the 1,000 most visited websites.
    3. 3.Websites outside the 10 million most visited run an A/B testing tool 2.8% of the time.
    4. 4.WordPress websites run A/B testing tools at 6.5%, B2B websites at 5.4%, online stores at 4.2% and Shopify stores at 2.2%.
    5. 5.Spanish (.es) websites run A/B testing tools at 11%, the highest of any country domain, against 1.8% for .us websites.

    Summary

    A marketing team argues about a homepage headline. One version promises speed, the other promises savings. Without a test, the loudest voice or the most senior person wins. With an A/B test, half the visitors see each version and the numbers decide.

    A/B testing is the core method of conversion rate optimization: show two versions of a page to comparable visitors and keep the one that produces more sales or leads. It turns opinions about design and copy into measured results, and small wins on a busy page add up. A testing tool is the software that splits the traffic and tracks the outcome.

    Only 3.2% of websites run an A/B testing tool on their homepage. Even in the most active group, sites ranked 1,000 to 10,000 by popularity, the share is 8.2%, fewer than one in twelve. For small and mid-size businesses, the story is plain: almost none are running homepage experiments with a testing tool.

    What we measured

    We used the September 2026 HTTP Archive crawl, a public record of 15,470,478 website homepages and the technologies each one loads. We counted every homepage that loads at least one A/B testing tool, such as Optimizely, VWO, AB Tasty or Convert, then split the results by popularity, platform, site type and country domain.

    Popularity ranks come from Google's Chrome UX Report, which groups websites by how many Chrome users visit them: the top 1,000, those ranked 1,000 to 10,000, and so on down to websites outside the 10 million most visited. Online stores are websites running an ecommerce platform; B2B websites are those running marketing automation software. Country domains are web addresses ending in a country code, such as .es for Spain.

    Fewer than one website in thirty tests

    3.2%
    of websites run an A/B testing tool on their homepage.

    That is 502,427 websites. For a business, the low rate is less a comfort than an opening. A single well-run test on your highest-traffic page can settle an argument about a headline, an offer or a layout with evidence, and most of your competitors are not doing it.

    The middle of the web tests the most

    8.2%
    of websites ranked 1,000 to 10,000 by popularity run an A/B testing tool, the highest of any tier.

    Adoption climbs with popularity, from 2.8% among websites outside the top 10 million to 3.5% for the top 1 million to 10 million, 4.6% for the top 100,000 to 1 million, and 7% for the top 10,000 to 100,000, before peaking at 8.2%. Then it drops to 4.9% among the 1,000 most visited websites.

    Share with an A/B testing tool by popularity tier
    Top 1,000
    4.9%
    Top 1,000 to 10,000
    8.2%
    Top 10,000 to 100,000
    7%
    Top 100,000 to 1M
    4.6%
    Top 1M to 10M
    3.5%
    Beyond top 10M
    2.8%

    Source: Suff Digital analysis of 15,470,478 website homepages · the public HTTP Archive crawl and Google's Chrome UX Report, September 2026

    Popularity tier Websites Share with an A/B testing tool
    Top 1,000 754 4.9%
    Top 1,000 to 10,000 6,746 8.2%
    Top 10,000 to 100,000 67,308 7%
    Top 100,000 to 1M 708,042 4.6%
    Top 1M to 10M 7,646,204 3.5%
    Beyond top 10M 7,041,424 2.8%

    The biggest sites often build their own testing systems in-house rather than buying a tool. The busy sites just below them, with enough traffic to reach a result quickly, are the heaviest users of off-the-shelf testing software.

    WordPress and B2B sites test the most

    WordPress websites run A/B testing tools at 6.5%, B2B websites with marketing automation at 5.4%, and online stores at 4.2%. Shopify stores sit at 2.2%, the lowest of the site types measured.

    Share with an A/B testing tool by group
    Online stores
    4.2%
    Shopify stores
    2.2%
    WordPress sites
    6.5%
    B2B sites (marketing automation)
    5.4%
    .us
    1.8%
    UK domains
    3.8%
    Canada domains
    3.5%
    Australia domains
    2%
    .de
    6.1%
    .fr
    7.4%
    .es
    11%
    EU country domains
    6%

    Source: Suff Digital analysis of 15,470,478 website homepages · the public HTTP Archive crawl and Google's Chrome UX Report, September 2026

    Group Websites Share with an A/B testing tool
    Online stores 3,911,812 4.2%
    Shopify stores 729,553 2.2%
    WordPress sites 4,945,342 6.5%
    B2B sites (marketing automation) 494,111 5.4%
    .us 24,234 1.8%
    UK domains 326,939 3.8%
    Canada domains 140,815 3.5%
    Australia domains 183,104 2%
    .de 554,459 6.1%
    .fr 280,999 7.4%
    .es 121,265 11%
    EU country domains 2,845,274 6%

    By country, continental Europe tests more than the English-speaking markets. Spanish domains lead at 11%, French at 7.4% and German at 6.1%, and EU country domains as a group reach 6%. UK domains sit at 3.8%, Canadian at 3.5%, Australian at 2% and .us domains at 1.8%.

    What this means for marketers and site owners

    If you are not testing, neither is almost every other website, and that is an opening. Pick your highest-traffic page and one question that matters: the headline, the main offer, the button wording or the length of a form. Run one clean test until it has enough visitors to call, and act on the result.

    You do not need heavy software to start; many website platforms and email tools include basic split testing. What matters more is a steady habit of testing one change at a time. Our conversion optimization services design and run those tests and report what each one changed in leads and revenue.

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<p style="font:14px/1.5 system-ui,sans-serif">Source: <a href="https://www.suffdigital.com/resources/data-studies/ab-testing-tool-adoption">Only 3.2% of Websites Run an A/B Testing Tool on Their Homepage - Suff Digital</a></p>

    Cite this study

    APA

    Suff Digital. (2026). Only 3.2% of Websites Run an A/B Testing Tool on Their Homepage. https://www.suffdigital.com/resources/data-studies/ab-testing-tool-adoption

    Plain link

    Only 3.2% of Websites Run an A/B Testing Tool on Their Homepage - Suff Digital - https://www.suffdigital.com/resources/data-studies/ab-testing-tool-adoption

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