The most visible headless CMS platforms in United Kingdom, October 2026

October 2026 · 15 questions asked from United Kingdom in English · ChatGPT, Google AI Overviews, Gemini and Google AI Mode · 60 answers read

Leader

Sanity

73Heralded Score, range 48–80

Most cited source

reddit.com

11citations

From Google AI Mode and Google AI Overviews

Where engines disagree most

Storyblok

2/4engines put it in their top three

Top three on Google AI Mode and ChatGPT, not on Gemini and Google AI Overviews

Brands

Rank Brand Rank change Heralded Score All AI Search Score trend Mentioned Recommended By engine Mentioned by Change
– Optimizely CMS US Unranked Too few answers Not measured 2#18
–
  • : Unranked
2% 0% First reading
– Portable Unranked Too few answers Not measured 0= #20
–
  • : Unranked
1% 0% None First reading
– Sitecore DK Unranked Too few answers Not measured 38#6
–
  • : Unranked
6% 0% First reading
– Sveltia CMS Unranked Too few answers Not measured 0= #20
–
  • : Unranked
1% 0% None First reading
– Umbraco DK Unranked Too few answers Not measured 22#11
–
  • : Unranked
3% 0% First reading

“=” marks brands whose score ranges overlap, so the test cannot separate them. Every brand named in at least three answers is ranked. AI and Search give each brand’s score and rank on that side alone. By engine has one dot per engine (ChatGPT, Google AI Overviews, Gemini and Google AI Mode), darker the more often it names the brand.

Most cited sources

Rank Source Type Cited in Engines Pages cited Brands its pages mention
1 reddit.com Community 10.0% 2 of 4 9 19
2 youtube.com Social 10.0% 1 of 4 9 Not read
3 pantheon.io Vendor site 8.3% 3 of 4 1 8
4 webflow.com Vendor site 8.3% 3 of 4 2 9
5 buttercms.com Vendor site 6.7% 2 of 4 1 Not read
6 cosmicjs.com Vendor site 6.7% 3 of 4 3 6
7 progressionagency.com Consultancy 6.7% 1 of 4 1 9
8 eseospace.com Consultancy 5.0% 3 of 4 3 Not read
9 jahia.com Vendor site 5.0% 2 of 4 1 Not read
10 jamstack.org Vendor site 5.0% 2 of 4 1 Not read

Questions asked

QuestionLanguageMost recommended
best headless cms for developers English Payload, Sanity, Storyblok and Strapi, tied
headless cms for ecommerce websites English Contentful, Hygraph, Payload, Sanity, Storyblok and Strapi, tied
how to manage content for a website and mobile app in one place English Contentful and Strapi, tied
how to migrate from a traditional cms to a headless cms English No brand recommended
headless cms vs traditional cms for marketing teams English CoreMedia and Sanity, tied

Each engine's top three

Method

Each leaderboard ranks brands on two sides. AI is how ChatGPT, Gemini, Google AI Overviews and Google AI Mode answer the board's buyer questions. Search is Google's top 10 results for the keywords behind those questions. All combines the two, where Search is measured.

For the AI side, each month Heralded asks every engine the same buyer questions, twice each, and reads every answer. An answer counts 0 for a brand it leaves out, 50 for a brand it names and 100 for a brand it recommends, and the Heralded Score is built from those. A brand named in at least three answers gets a score and a place.

How the leaderboards are measured