Company lists · Data verified August 2026

Top 25 Assessment and testing software companies based in the United Kingdom

Name: Assessment and testing software companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 131 companies tracked

There are 131 assessment and testing software companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 4,785 professional contacts across them, including 457 with verified work emails and 499 with mobile numbers. London is the largest hub.

This list covers assessment and testing software companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

131Companies

4,785Contacts tracked

457Verified emails

499Mobile numbers

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The 25 largest assessment and testing software companies based in the United Kingdom

Ranked by team size

Top 25 of 131 assessment and testing software companies based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	PSI Services LLC	Guildford	1,001-5,000	1,010	2
2	BTL	Saltaire	51-200	381	9
3	Vretta	London	51-200	126	54
4	Codility	London	51-200	121	58
5	Ldra Limited	Wirral	51-200	86	40
6	GL Education	Houghton-Le-Spring	201-500	69	34
7	GL Assessment	London	201-500	63	36
8	Teamco	Chatham	51-200	55	16
9	Kudos Games Services	Doncaster	51-200	37	14
10	Unseen	London	51-200	35	19
11	Tomax-Think Academy	n/a	51-200	35	15
12	Doublestruck	London	11-50	28	21
13	Graduates First JOB Assessment Experts	Huddersfield	11-50	22	6
14	Hogrefe UK	Oxford	11-50	20	8
15	Audacix Makers Of Cyber Chief & Qsome	London	11-50	20	3
16	IKM Teckchek	Croydon	11-50	19	7
17	ATE Solutions LTD	Northampton	11-50	16	10
18	ZZISH	London	11-50	16	5
19	Certify Assessment Solutions	Manchester	1-10	15	11
20	SYNAP	Leeds	11-50	14	12
21	keath.ai	Headquarters	11-50	14	6
22	Grademaker LTD	Bristol	11-50	11	6
23	Renaissance UK & Ireland	Brentford	201-500	11	5
24	MY Performance Learning	London	11-50	10	3
25	Speedwell Software	Chittering	11-50	9	4

Showing 25 of 131 assessment and testing software companies based in the United Kingdom

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Assessment and testing software companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 49 HQs

499Contacts with mobile numbers

4Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Assessment and testing software companies by metro

Metro	Companies
Assessment and testing software companies in London	49
Assessment and testing software companies in Manchester	5
Assessment and testing software companies in Oxford	3
Assessment and testing software companies in Leeds	3
Assessment and testing software companies in Guildford	3
Assessment and testing software companies in Birmingham	2
Assessment and testing software companies in Brentford	2

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “assessment and testing software companies”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 4 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many assessment and testing software companies are there based in the United Kingdom?

There are 131 assessment and testing software companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

PSI Services LLC, headquartered in Guildford, tops this list with the largest team on record.

Which city has the most assessment and testing software companies?

London leads with 49 headquartered companies, followed by Manchester (5) and Oxford (3).

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 457 verified decision-maker contacts tracked across these 131 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.