Company lists · Data verified August 2026

Top 25 Assessment software companies based in the United Kingdom

Name: Assessment 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 176 companies tracked

There are 176 assessment software companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 3,142 professional contacts across them, including 680 with verified work emails and 477 with mobile numbers. London is the largest hub.

This list covers assessment 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.

176Companies

3,142Contacts tracked

680Verified emails

477Mobile numbers

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The 25 largest assessment software companies based in the United Kingdom

Ranked by team size

Top 25 of 176 assessment 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	Accurate Background UK	Brighton And Hove	201-500	142	79
4	Vretta	London	51-200	126	54
5	Codility	London	51-200	121	58
6	Saville Assessment	London	51-200	113	55
7	GL Education	Houghton-Le-Spring	201-500	69	34
8	Data Solutions International	Derby	51-200	69	14
9	GL Assessment	London	201-500	63	36
10	Eras LTD	Diss	11-50	58	8
11	Teamco	Chatham	51-200	55	16
12	Accelerate People	London	11-50	38	22
13	Professional Assessment	Leatherhead	11-50	36	24
14	Equalture	London	11-50	36	23
15	Unseen	London	51-200	35	19
16	Tomax-Think Academy	n/a	51-200	35	15
17	Doublestruck	London	11-50	28	21
18	Symbiotics	Worcester	11-50	24	16
19	Graduates First JOB Assessment Experts	Huddersfield	11-50	22	6
20	Thrive	London	11-50	21	10
21	Hogrefe UK	Oxford	11-50	20	8
22	IKM Teckchek	Croydon	11-50	19	7
23	ZZISH	London	11-50	16	5
24	salve.inno	London	11-50	16	1
25	SYNAP	Leeds	11-50	14	12

Showing 25 of 176 assessment software companies based in the United Kingdom

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Assessment software companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 69 HQs

477Contacts with mobile numbers

5Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Assessment software companies by metro

Metro	Companies
Assessment software companies in London	69
Assessment software companies in Oxford	5
Assessment software companies in Bristol	3
Assessment software companies in Bournemouth	2
Assessment software companies in Manchester	2
Assessment software companies in Cambridge	2
Assessment software companies in Belfast	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 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; 5 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 software companies are there based in the United Kingdom?

There are 176 assessment 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 software companies?

London leads with 69 headquartered companies, followed by Oxford (5) and Bristol (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 680 verified decision-maker contacts tracked across these 176 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.