Most-Used SEO by UK Companies (2026)
Across 62,720 UK companies with a detectable SEO system, Yoast SEO is the largest detected system with 78.5% share, ahead of RankMath SEO and All in One SEO.
Across 2,038,422 trading UK companies, 62,720 have a detectable SEO system. The market is concentrated around Yoast SEO, which appears at 49,229 companies, or 78.5% of detected use.
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RankMath SEO is the next largest system, with 7,068 companies and 11.3% share, followed by All in One SEO at 5,501 companies and 8.8%. Size does not change the pattern much: Yoast SEO accounts for 79.1% of detected companies Under 10 employees, 77.5% in 10–50 employees, and 76.9% Over 50 employees.
The long tail is small. The SEO Framework appears at 826 companies, SEOmatic at 556, Google XML Sitemaps at 153, and Spotzer at 69.
62,742
Companies with detected SEO
Of 2,066,481 UK companies
3%
Detection rate
2026
8
Systems detected
In this category
78.5%
Leader share
Yoast SEO
UK companies SEO market share
Share of the 62,742 UK companies with a detectable system. As of June 2026.
SEO compared
| System | UK companies | Share | Median headcount | London share | Typical profile |
|---|---|---|---|---|---|
| Yoast SEO | 49,150 | 78.3% | 6 | 18.1% | Small firms, broadest detected usage |
| RankMath SEO | 7,063 | 11.3% | 7 | 17.5% | Small firms, second-largest detected share |
| All in One SEO | 5,513 | 8.8% | 6 | 20% | Small firms, London-skewed usage |
| The SEO Framework | 828 | 1.3% | 6 | 19.2% | Small firms, niche adoption |
| SEOmatic | 556 | 0.9% | 5 | 27.6% | Micro firms, London-skewed usage |
| Google XML Sitemaps | 152 | 0.2% | — | — | Buy these companies as a spreadsheet → |
| SEOPlatform.io | 116 | 0.2% | — | — | Buy these companies as a spreadsheet → |
| Spotzer | 69 | 0.1% | — | — | Buy these companies as a spreadsheet → |
Systems detected below the page threshold appear with counts only; their full lists are available in the Firmbase app.
Market leader by size
The leading SEO system shifts with company size: among UK companies with under 10 employees, Yoast SEO leads at 79.1% of the 41,277 with a detectable system; among UK companies with 10–50 employees, Yoast SEO leads at 77.4% of the 18,758 with a detectable system; and among UK companies with over 50 employees, Yoast SEO leads at 76.8% of the 2,707 with a detectable system.
Under 10 employees
79.1% of band
This band contains 41,150 detected companies, with Yoast SEO accounting for 79.1%. RankMath SEO and All in One SEO are the main named alternatives in the wider market.
10–50 employees
77.4% of band
Among 18,868 detected companies in this band, Yoast SEO holds 77.5%. The competitive set remains familiar, with RankMath SEO and All in One SEO making up most of the named challenger volume overall.
Over 50 employees
76.8% of band
The Over 50 employees band is smaller, at 2,702 detected companies, and Yoast SEO still has 76.9%. Larger employers do not appear to move the market away from the same main systems.
How SEO usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
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UK companies by SEO
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Frequently asked questions
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