Company lists · Data verified August 2026

Top 17 Assessment and testing software companies based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 44 companies tracked

There are 44 assessment and testing software companies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 2,712 professional contacts across them, including 219 with verified work emails and 110 with mobile numbers. London is the largest hub.

This list covers assessment and testing software companies headquartered in London, 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.

44Companies

2,712Contacts tracked

219Verified emails

110Mobile numbers

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The 17 largest assessment and testing software companies based in London, United Kingdom

Ranked by team size

Top 17 of 44 assessment and testing software companies based in London, 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	Vretta	London	51-200	126	54
2	Codility	London	51-200	121	58
3	GL Assessment	London	201-500	63	36
4	Unseen	London	51-200	35	19
5	Doublestruck	London	11-50	28	21
6	Audacix Makers Of Cyber Chief & Qsome	London	11-50	20	3
7	ZZISH	London	11-50	16	5
8	MY Performance Learning	London	11-50	10	3
9	Topscore Unseen Group	London	1-10	6	4
10	quodit.io	London	1-10	5	2
11	Ascert	London	51-200	4	2
12	Cognitive Persona UK Limited	London	11-50	4	2
13	Learner Tracking Systems	London	1-10	4	2
14	Youcap LTD	London	1-10	3	3
15	29forward Australia	London	1-10	3	1
16	H2 Cognitive Designs	London	11-50	2	2
17	ENIEN	London	1-10	1	1

Showing 17 of 44 assessment and testing software companies based in London, United Kingdom

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

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 49 HQs

110Contacts with mobile numbers

2Emails 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 in the United Kingdom

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 London, 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; 2 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 London, United Kingdom?

There are 44 assessment and testing software companies headquartered in London, United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Vretta, headquartered in London, 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 219 verified decision-maker contacts tracked across these 44 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.