Company lists · Data refreshed September 2026

Top 25 Software quality assurance firms based in the United Kingdom

Name: Software quality assurance firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 164 companies tracked

RevenueBase identified 164 software quality assurance firms headquartered in the United Kingdom as of September 2026 and tracks 3,098 professional contacts across them, including 464 with verified work emails. London is the largest hub.

This list covers software quality assurance firms headquartered in the United Kingdom, 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.

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

164Companies

3,098Contacts tracked

464Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest software quality assurance firms based in the United Kingdom

Ranked by team size

Top 25 of 164 software quality assurance firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to software quality assurance 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	2i	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 21, 2026	201-500	248 contacts →
	Indirect evidence “We help CTOs, Programme Directors, and Engineering Leaders deliver complex technology change safely, on time, under control, and at sustainable cost.” Source: RevenueBase Database · checked Sep 21, 2026
2	ROQ	Partial evidence	Chorley, United KingdomHQ checked Sep 21, 2026	51-200	109 contacts →
	Partial evidence “Roq is changing the way the world views Quality.” Source: RevenueBase Database · checked Sep 21, 2026
3	Qniverse	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	70 contacts →
	Strong evidence “Qniverse is your trusted Quality Assurance service partner that stands at the forefront of a paradigm shift in QA by redefining quality.” Source: RevenueBase Database · checked Sep 21, 2026
4	Zigzag QA	Partial evidence	Abingdon, United KingdomHQ checked Sep 21, 2026	11-50	47 contacts →
	Partial evidence “ZigZag QA is your trusted worldwide quality leader, offering true global reach and unrivaled expertise to reduce risk and efforts.” Source: RevenueBase Database · checked Sep 21, 2026
5	Calibrecode Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	39 contacts →
	Strong evidence “CalibreCode provides on-demand and integrated Quality Assurance Solutions for Product Management & Engineering teams.” Source: RevenueBase Database · checked Sep 21, 2026
6	Kudos Games Services	Strong evidence	Doncaster, United KingdomHQ checked Sep 21, 2026	51-200	37 contacts →
	Strong evidence “At Kudos QA, we are committed to delivering top-tier software and gaming quality assurance, ensuring optimal performance, reliability, and user satisfaction across diverse…” Source: RevenueBase Database · checked Sep 21, 2026
7	Cell Software Services LTD	Partial evidence	Brighton, United KingdomHQ checked Sep 21, 2026	11-50	28 contacts →
	Partial evidence “Cell Software is an expert provider of software solutions.” Source: RevenueBase Database · checked Sep 21, 2026
8	Experior	Indirect evidence	Staines, United KingdomHQ checked Sep 21, 2026	51-200	21 contacts →
	Indirect evidence “At Experior we believe the user experience is everything.” Source: RevenueBase Database · checked Sep 21, 2026
9	Challengecurve	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	18 contacts →
	Strong evidence “ChallengeCurve helps organisations embrace innovation and transformation with confidence and courage by designing and implementing customised quality assurance strategies.” Source: RevenueBase Database · checked Sep 21, 2026
10	SMQA	Strong evidence	Canterbury, United KingdomHQ checked Sep 21, 2026	11-50	14 contacts →
	Strong evidence “SMQA is an established IT Consulting services company specialised in Quality Assurance, Performance Engineering and DevOps helping clients providing precise, scalable, quality…” Source: RevenueBase Database · checked Sep 21, 2026
11	Code4thought	Partial evidence	Holloway, United KingdomHQ checked Sep 21, 2026	11-50	13 contacts →
	Partial evidence “code4thought is a technology company with a unique purpose: to render technology transparent for large-scale software and AI-based systems.” Source: RevenueBase Database · checked Sep 21, 2026
12	CQE	Partial evidence	Leeds, United KingdomHQ checked Sep 21, 2026	11-50	12 contacts →
	Partial evidence “A team of innovative Technology Leaders and Quality Engineers, we take a solution-led approach to help our clients engineer quality into all stages of their product lifecycle.” Source: RevenueBase Database · checked Sep 21, 2026
13	Purple Mavens	Strong evidence	Solihull, United KingdomHQ checked Sep 21, 2026	11-50	11 contacts →
	Strong evidence “Purple Mavens is a UK based software development company offering software-based development solutions tailored to suit the customer needs with additional services like Quality…” Source: RevenueBase Database · checked Sep 21, 2026
14	Experimentus	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	9 contacts →
	Strong evidence “We help organisations build, implement and improve software quality processes that will enable them to measure and manage new and existing apps or systems more effectively.” Source: RevenueBase Database · checked Sep 21, 2026
15	Fortitude 17 Limited	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	6 contacts →
	Partial evidence “Assurance.” Source: RevenueBase Database · checked Sep 21, 2026
16	Zigzag Associates LTD	Strong evidence	Abingdon, United KingdomHQ checked Sep 21, 2026	11-50	5 contacts →
	Strong evidence “Founded in 2009, Zigzag is a privately-owned global leader in Quality Assurance.” Source: RevenueBase Database · checked Sep 21, 2026
17	Proper QA	Strong evidence	Edinburgh, United KingdomHQ checked Sep 21, 2026	1-10	4 contacts →
	Strong evidence “Founded in 2011 by industry veteran Nick Barrett, Proper QA is a quality assurance service provider, specialising in quality assurance testing and the creation of innovative test…” Source: RevenueBase Database · checked Sep 21, 2026
18	The CQA Company	Partial evidence	Knutsford, United KingdomHQ checked Sep 21, 2026	11-50	3 contacts →
	Partial evidence “The CQA Company is a division of Arithmos, a Technology Solutions and Services provider, Quality Compliance and Consulting company in the Life Sciences industry, headquartered in…” Source: RevenueBase Database · checked Sep 21, 2026
19	Digital Quality Associates	Strong evidence	Buckinghamshire, United KingdomHQ checked Sep 21, 2026	1-10	3 contacts →
	Strong evidence “DQA provides specialist quality assurance consultancy, auditing, and validation services to pharmaceutical, biotech, medical device, and healthcare organisations worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
20	Maserfan Consulting Limited	Indirect evidence	Newbury, United KingdomHQ checked Sep 21, 2026	1-10	3 contacts →
	Indirect evidence “At Maserfan we bring extensive experience in the field of testing services.” Source: RevenueBase Database · checked Sep 21, 2026
21	Nixcer IT Solutions	Strong evidence	Derby, United KingdomHQ checked Sep 21, 2026	1-10	3 contacts →
	Strong evidence “Nixcer is a services-based company that guarantees and focuses on quality assurance.” Source: RevenueBase Database · checked Sep 21, 2026
22	Zerocode	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	2 contacts →
	Strong evidence “Zerocode helps product development teams integrate automated quality assurance.” Source: RevenueBase Database · checked Sep 21, 2026
23	Aruvi Consulting	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	2 contacts →
	Strong evidence “ARUVI is a boutique style software testing and quality assurance consultancy operating in the Insurance industry.” Source: RevenueBase Database · checked Sep 21, 2026
24	Guild Associates	Indirect evidence	Clevedon, United KingdomHQ checked Sep 21, 2026	51-200	1 contacts →
	Indirect evidence “The consultants at Guild Associates have contributed significantly to a successful testing programme at HBOS FS and have achieved results that we can trust.” Source: RevenueBase Database · checked Sep 21, 2026
25	Verum Solutions LTD	Partial evidence	Glasgow, United KingdomHQ checked Sep 21, 2026	1-10	1 contacts →
	Partial evidence “To address industry concerns regarding escalation of Oil & Gas project costs associated with poor quality during construction, Verum Solutions Ltd has developed a cloud-based…” 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: software quality assurance 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 software quality assurance firms.
Partial evidence: Its own public description names part of software quality assurance firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name software quality assurance 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 164 software quality assurance firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 464 reachable decision-makers.

Free signup · no credit card

View the full list →

Software quality assurance firms based in the United Kingdom at a glance

As of Sep 21, 2026

15.0%Verified-email coverage

18.9Average contacts per company

1-10Median size (employees)

35.4%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

115

11-50

51-200

201-500

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 164 companies.

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 software quality assurance 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.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “software quality assurance 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 software quality assurance 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 software quality assurance firms, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
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, 464 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.

Software quality assurance firms by metro

Software quality assurance firms in London58

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 software quality assurance 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 software quality assurance firms are there based in the United Kingdom?

RevenueBase identified 164 software quality assurance firms headquartered in the United Kingdom 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?

2i, headquartered in Edinburgh, tops this list with the largest team on record.

Which city has the most software quality assurance firms?

London leads with 58 headquartered companies, followed by Manchester (8) and Leeds (4).

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 464 verified decision-maker contacts tracked across these 164 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.

Ready to reach these companies? Verified emails and direct dials for all 164 software quality assurance firms based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Software quality assurance firms by geography

Browse the directory

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.