SEO Used by UK SaaS Companies: Market Share (2026)
Detected SEO usage across 1,768 of 39,746 trading UK SaaS companies, with Yoast SEO leading at 77.8% of detected installs.
SEO usage is detectable at 1,768 of 39,746 trading UK SaaS companies, across 6 systems. Yoast SEO accounts for 77.8% (1,376) of those detections, well ahead of RankMath SEO at 12.6% (222) and All in One SEO at 7.5% (132).
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The pattern is consistent by company size. Yoast SEO has 77.3% of the 1,103 companies under 10 employees, 78.5% of the 610 companies with 10–50 employees, and 80.0% of the 55 companies over 50 employees.
The long tail is small but visible. The SEO Framework appears at 1.9% (34), SEOmatic at 1.4% (25), and Google XML Sitemaps at 0.1% (1).
1,756
SaaS with detected SEO
Of 39,965 UK SaaS
4.4%
Detection rate
2026
7
Systems detected
In this category
77.8%
Leader share
Yoast SEO
UK SaaS SEO market share
Share of the 1,756 UK SaaS with a detectable system. As of June 2026.
SEO compared
| System | UK SaaS | Share | Median headcount | London share | Typical profile |
|---|---|---|---|---|---|
| Yoast SEO | 1,366 | 77.8% | 6 | 33.8% | Small SaaS teams, largest share |
| RankMath SEO | 220 | 12.5% | 7 | 39.1% | Small SaaS teams, second-largest share |
| All in One SEO | 132 | 7.5% | 6 | 39.4% | Small SaaS teams, third-largest share |
| The SEO Framework | 33 | 1.9% | — | — | View these companies in Firmbase → |
| SEOmatic | 25 | 1.4% | — | — | View these companies in Firmbase → |
| SEOPlatform.io | 1 | 0.1% | — | — | View these companies in Firmbase → |
| Google XML Sitemaps | 1 | 0.1% | — | — | View these companies in Firmbase → |
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 SaaS with under 10 employees, Yoast SEO leads at 77.6% of the 1,103 with a detectable system; among UK SaaS with 10–50 employees, Yoast SEO leads at 78% of the 599 with a detectable system; and among UK SaaS with over 50 employees, Yoast SEO leads at 79.6% of the 54 with a detectable system.
Under 10 employees
77.6% of band
Among the 1,103 companies in this band, Yoast SEO has 77.3% share. This is the largest SaaS SEO cohort here, with competition mainly coming from the wider second and third systems: RankMath SEO and All in One SEO.
10–50 employees
78% of band
This band contains 610 companies, with Yoast SEO on 78.5%. RankMath SEO and All in One SEO remain the main alternatives in the wider market, while the smaller systems sit in a narrow long tail.
Over 50 employees
79.6% of band
The over-50 employee band is much smaller, at 55 companies, and Yoast SEO has 80.0%. The size split does not change the ranking materially: the same system remains first across all three employee bands.
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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Frequently asked questions
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