Company lists · Data verified August 2026

Top 23 Assessment software developers based in the United Kingdom

Name: Assessment software developers 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 46 companies tracked

There are 46 assessment software developers headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 1,894 professional contacts across them, including 217 with verified work emails and 369 with mobile numbers. London is the largest hub.

This list covers assessment software developers 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.

46Companies

1,894Contacts tracked

217Verified emails

369Mobile numbers

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The 23 largest assessment software developers based in the United Kingdom

Ranked by team size

Top 23 of 46 assessment software developers 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	GL Education	Houghton-Le-Spring	201-500	69	34
5	Accelerate People	London	11-50	38	22
6	Doublestruck	London	11-50	28	21
7	Graduates First JOB Assessment Experts	Huddersfield	11-50	22	6
8	Hogrefe UK	Oxford	11-50	20	8
9	ZZISH	London	11-50	16	5
10	SYNAP	Leeds	11-50	14	12
11	keath.ai	Headquarters	11-50	14	6
12	Grademaker LTD	Bristol	11-50	11	6
13	Renaissance UK & Ireland	Brentford	201-500	11	5
14	Speedwell Software	Chittering	11-50	9	4
15	Geektastic	London	51-200	7	1
16	Topscore Unseen Group	London	1-10	6	4
17	Assess Management LTD Validateskills.com	Wilts	1-10	5	2
18	Learner Tracking Systems	London	1-10	4	2
19	The English Quiz	London	1-10	4	2
20	Youcap LTD	London	1-10	3	3
21	Knowledgesmart	Bath	1-10	3	1
22	The Compliance & Skills Academy LTD	Cheshire	1-10	1	1
23	Orecor	Birmingham	1-10	1	1

Showing 23 of 46 assessment software developers based in the United Kingdom

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Assessment software developers based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 20 HQs

369Contacts with mobile numbers

3Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Assessment software developers by metro

Metro	Companies
Assessment software developers in London	20
Assessment software developers in Oxford	3
Assessment software developers in Brentford	2
Assessment software developers in Cambridge	1
Assessment software developers in Chittering	1
Assessment software developers in Manchester	1
Assessment software developers in Headquarters	1

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 developers”, 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; 3 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 developers are there based in the United Kingdom?

There are 46 assessment software developers 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 developers?

London leads with 20 headquartered companies, followed by Oxford (3) and Brentford (2).

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 217 verified decision-maker contacts tracked across these 46 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.