Company lists · Data refreshed September 2026

Top 25 SEO audit firms worldwide

Name: SEO audit firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 15,773 companies tracked

RevenueBase identified 15,773 SEO audit firms worldwide as of September 2026 and tracks 116,029 professional contacts across them, including 10,387 with verified work emails. The United States is the largest market and London the largest hub.

This list covers SEO audit firms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026. Country and city lists for SEO audit firms follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

15,773Companies

116,029Contacts tracked

10,387Verified emails

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The 25 largest SEO audit firms worldwide

Ranked by team size

Top 25 of 15,773 SEO audit firms worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to SEO audit firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	SEO	Indirect evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	n/a	6,896 contacts →
	Indirect evidence “The way people search is changing.” Source: RevenueBase Database · checked Sep 21, 2026
2	SEO INC	Partial evidence	Carlsbad, CA, United StatesHQ checked Sep 21, 2026	n/a	825 contacts →
	Partial evidence “Since its inception in 1997, SEO Inc.” Source: RevenueBase Database · checked Sep 21, 2026
3	Wildnet Technologies	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	590 contacts →
	Partial evidence “Wildnet Technologies - Best Digital Marketing Agency \| White Label Services for Growing Agencies \| Results-Driven AI SEO Services We don't just run campaigns-we build growth…” Source: RevenueBase Database · checked Sep 21, 2026
4	Smart Solutions	Indirect evidence	United StatesHQ checked Sep 21, 2026	n/a	534 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
5	KPL Tech Solution Pvt. LTD	Indirect evidence	Middletown, DE, United StatesHQ checked Sep 21, 2026	201-500	390 contacts →
	Indirect evidence “Do you want to see your business on heights?” Source: RevenueBase Database · checked Sep 21, 2026
6	Boostability	Partial evidence	Lehi, UT, United StatesHQ checked Sep 21, 2026	201-500	326 contacts →
	Partial evidence “At Boostability, we're more than just an SEO company; we're your strategic partner in driving online growth.” Source: RevenueBase Database · checked Sep 21, 2026
7	Coalition Technologies	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 2026	201-500	320 contacts →
	Partial evidence “Coalition Technologies is one of the leading SEO & web design agencies in the United States.” Source: RevenueBase Database · checked Sep 21, 2026
8	auroin.com	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	183 contacts →
	Partial evidence “Incorporated in 2010, AuroIN LLC is a premier digital marketing agency based in World Trade Center, New York, specializing in AI-driven SEO strategies that deliver measurable ROI.” Source: RevenueBase Database · checked Sep 21, 2026
9	WP SEO AI	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 21, 2026	51-200	166 contacts →
	Indirect evidence “Even before AI-powered Search and platforms like ChatGPT or Perplexity started reshaping how people search, we anticipated the shift in user behaviour.” Source: RevenueBase Database · checked Sep 21, 2026
10	Liveseo	Partial evidence	Maringá, BrazilHQ checked Sep 21, 2026	51-200	141 contacts →
	Partial evidence “Founded in 2016 in Spain, and currently operating in Brazil, liveSEO performs consistent and well-targeted work in SEO (search engine optimization), attracting companies looking…” Source: RevenueBase Database · checked Sep 21, 2026
11	Blushark Digital	Indirect evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	51-200	137 contacts →
	Indirect evidence “BluShark Digital LLC was founded on the principle of providing high quality online marketing solutions for companies struggling to stand out online.” Source: RevenueBase Database · checked Sep 21, 2026
12	Essentials The Agency	Indirect evidence	Jakarta Barat, IndonesiaHQ checked Sep 21, 2026	11-50	134 contacts →
	Indirect evidence “At essentials the agency, we help brands take control of their digital presence and dominate their online space, not just exist in it.” Source: RevenueBase Database · checked Sep 21, 2026
13	Dealeron	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 21, 2026	201-500	129 contacts →
	Indirect evidence “DealerOn has been the perfect partner for over dealers across North America.” Source: RevenueBase Database · checked Sep 21, 2026
14	Mainstreethost	Indirect evidence	Amherst, NY, United StatesHQ checked Sep 21, 2026	51-200	128 contacts →
	Indirect evidence “Mainstreethost specializes in everything you need to have a successful online presence, including search engine optimization, paid search marketing, website design, social media…” Source: RevenueBase Database · checked Sep 21, 2026
15	Semalt	Partial evidence	Kyiv, UkraineHQ checked Sep 21, 2026	51-200	127 contacts →
	Partial evidence “Semalt is a results-driven, technology-inspired SEO company.” Source: RevenueBase Database · checked Sep 21, 2026
16	FIX Group Of Companies	Indirect evidence	Mesa Geitonia, CyprusHQ checked Sep 21, 2026	501-1,000	126 contacts →
	Indirect evidence “FIX - профессиональная компания, оказывающая полный спектр услуг в области интернет-маркетинга: разработка web-ресурсов и web-приложений, поисковая оптимизация и продвижение…” Source: RevenueBase Database · checked Sep 21, 2026
17	Search Engine Journal	Partial evidence	Boca Raton, FL, United StatesHQ checked Sep 21, 2026	11-50	122 contacts →
	Partial evidence “We are SEO professionals, content writers, and marketers, just like you.” Source: RevenueBase Database · checked Sep 21, 2026
18	SEOP	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	121 contacts →
	Partial evidence “SEOP is one of the leaders in the Search Engine Optimization industry and was co-founded by SEO experts that thrive on a combination of in-depth expertise and creative, forward…” Source: RevenueBase Database · checked Sep 21, 2026
19	Leave Code Technologies Pvt. LTD	Indirect evidence	Laxmi Nagar, IndiaHQ checked Sep 21, 2026	11-50	120 contacts →
	Indirect evidence “Leave Code offers you the best digital marketing services for your products and services.” Source: RevenueBase Database · checked Sep 21, 2026
20	Local Splash	Partial evidence	Fountain Valley, CA, United StatesHQ checked Sep 21, 2026	51-200	119 contacts →
	Partial evidence “Local Splash is the leading local SEO service that specializes in getting our clients high rankings in local search engine results.” Source: RevenueBase Database · checked Sep 21, 2026
21	Seobrothers	Partial evidence	Skanste, LatviaHQ checked Sep 21, 2026	51-200	116 contacts →
	Partial evidence “SEOBROTHERS is a full-cycle SEO agency where search engine optimisation and digital marketing drive everything we do.” Source: RevenueBase Database · checked Sep 21, 2026
22	Hennessey Digital	Partial evidence	North Hollywood, CA, United StatesHQ checked Sep 21, 2026	51-200	115 contacts →
	Partial evidence “Named to Fortune’s 50 Best Workplaces in Advertising & Marketing, Hennessey Digital is an award-winning digital marketing agency specializing in SEO for lawyers and other online…” Source: RevenueBase Database · checked Sep 21, 2026
23	Studiohawk	Partial evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	51-200	111 contacts →
	Partial evidence “StudioHawk is Australia’s #1 dedicated SEO & AI Search agency.” Source: RevenueBase Database · checked Sep 21, 2026
24	Grizzly NEW Marketing	Partial evidence	Breda, NetherlandsHQ checked Sep 21, 2026	51-200	109 contacts →
	Partial evidence “Grizzly New Marketing is een gespecialiseerd SEO marketingbureau in Nederland (Breda en Rotterdam), België (Antwerpen-Berchem) en de Verenigde Staten (New York).” Source: RevenueBase Database · checked Sep 21, 2026
25	Bigseo	Partial evidence	Barcelona, SpainHQ checked Sep 21, 2026	51-200	108 contacts →
	Partial evidence “En nuestra agencia SEO en Barcelona somos unos apasionados del posicionamiento web.” Source: RevenueBase Database · checked Sep 21, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: SEO audit firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names SEO audit firms.
Partial evidence: Its own public description names part of SEO audit firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name SEO audit firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 15,773 SEO audit firms worldwide

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SEO audit firms worldwide at a glance

As of Sep 21, 2026

9.0%Verified-email coverage

7.4Average contacts per company

1-10Median size (employees)

1.9%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11,613

11-50

3,424

51-200

529

201-500

102

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among SEO audit firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for SEO audit firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “SEO audit firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names SEO audit firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among SEO audit firms, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 10,387 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

SEO audit firms by location

62 lists · largest first

Every SEO audit firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names SEO audit firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many SEO audit firms are there worldwide?

RevenueBase identified 15,773 SEO audit firms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

SEO, headquartered in Melbourne, tops this list with the largest team on record.

Which country has the most SEO audit firms?

The United States leads with 3,456 companies, followed by India (1,738) and the United Kingdom (1,040). Every SEO audit firms list by country and city is linked on this page.

Which city has the most SEO audit firms?

London leads with 293 headquartered companies, followed by New Delhi (176) and New York (144).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 10,387 verified decision-maker contacts tracked across these 15,773 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.