Most-Used SEO by UK Companies (2026)

Updated June 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.

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.

62,720

Companies with detected SEO

Of 2,038,422 UK companies

3.1%

Detection rate

2026

Systems detected

In this category

78.5%

Leader share

Yoast SEO

UK companies SEO market share

Google XML Sitemaps

Spotzer

Share of the 62,720 UK companies with a detectable system. As of June 2026.

SEO compared

System	UK companies	Share	Median headcount	London share	Typical profile
Yoast SEO	49,229	78.5%	6	18.1%	Small firms, broadest detected usage
RankMath SEO	7,068	11.3%	7	17.6%	Small firms, second-largest detected share
All in One SEO	5,501	8.8%	6	20.1%	Small firms, London-skewed usage
The SEO Framework	826	1.3%	6	19.2%	Small firms, niche adoption
SEOmatic	556	0.9%	5	27.5%	Micro firms, London-skewed usage
Google XML Sitemaps	153	0.2%	—	—	View these companies in Firmbase →
Spotzer	69	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

Under 10 employees

Yoast SEO

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

Yoast SEO

77.5% 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

Yoast SEO

76.9% 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

Methodology

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.

Sources

All product names are trademarks of their respective owners. Firmbase is not affiliated with, sponsored by, or endorsed by any trademark owner.

UK companies by SEO

Companies Using Yoast SEO in the UK Companies Using RankMath SEO in the UK Companies Using All in One SEO in the UK Companies Using The SEO Framework in the UK Companies Using SEOmatic in the UK

Related directories

SEO Used by UK B2B: Market Share (2026)SEO Used by UK B2C: Market Share (2026)SEO Used by UK field services: Market Share (2026)SEO Used by UK construction: Market Share (2026)SEO Used by UK advanced manufacturing: Market Share (2026)

Frequently asked questions

What is the most-used SEO among UK companies?

Yoast SEO is the most-detected SEO among UK companies, with 78.5% share (49,229 of 62,720 companies with a detectable system), ahead of RankMath SEO (11.3%) and All in One SEO (8.8%).

How many UK companies have a detectable SEO?

62,720 of 2,038,422 actively-trading UK companies (3.1%) have a SEO detectable from their public website. The remainder either run systems with no public web footprint or none at all, so detected share figures are a conservative floor.

What is a SEO?

An SEO system helps a company manage the search-facing parts of its website, including page metadata, indexing signals and sitemap output. For UK companies, it usually sits inside the website publishing layer and handles routine technical search tasks rather than paid advertising.

How is SEO usage detected?

Firmbase crawls the public website of every actively-trading company in this scope and fingerprints the technologies present — scripts, widgets, booking and checkout flows. A company is attributed to a system when that system's signatures are found; systems with no public web footprint are not attributable, which is why every share figure on this page means share of companies with a detectable system.

Which has more UK companies, Yoast SEO or RankMath SEO?

Yoast SEO: 49,229 detected companies versus 7,068 for RankMath SEO, of the 62,720 UK companies with a detectable SEO.

What is the best SEO for UK companies?

This page publishes observed usage, not recommendations or a ranked buyer guide. Yoast SEO has the largest detected share in every size band: 79.1% of 41,150 companies Under 10 employees, 77.5% of 18,868 companies with 10–50 employees, and 76.9% of 2,702 companies Over 50 employees.

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