Company lists · Data verified August 2026

Top 25 Custom software development companies based in the United Kingdom

Name: Custom software development 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 2,918 companies tracked

There are 2,918 custom software development companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 29,009 professional contacts across them, including 6,428 with verified work emails and 1,312 with mobile numbers. London is the largest hub.

This list covers custom software development 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.

2,918Companies

29,009Contacts tracked

6,428Verified emails

1,312Mobile numbers

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The 25 largest custom software development companies based in the United Kingdom

Ranked by team size

Top 25 of 2,918 custom software development 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	Andersen LAB	London	1,001-5,000	3,609	1,152
2	BBD	London	1,001-5,000	1,220	485
3	Softteco	Loughborough	501-1,000	539	247
4	Biztech Consulting & Solutions	Ruislip Ruislip	201-500	317	10
5	Mallow Technologies Private Limited	London	51-200	315	129
6	Q Agency	London	201-500	263	166
7	Fiftyfive Technologies	London	201-500	247	29
8	Netweb Software	Swindon	201-500	237	165
9	Mobcoder	Surrey	201-500	233	77
10	Dreamztech Solutions	Watford	201-500	227	68
11	Emizen Tech	London	201-500	207	19
12	Sphinx Solutions Pvt. LTD	London	201-500	205	51
13	Kanhasoft	London	51-200	130	15
14	Devico Solutions	London	201-500	118	33
15	Saratoga Software	Worcester	51-200	91	52
16	PDMS	Braddan	51-200	91	34
17	Ghyston	West Bristol	51-200	61	38
18	Gemba Advantage	London	51-200	60	46
19	3i-Vision	London	51-200	59	22
20	Deveire	Londonderry	51-200	56	32
21	Cmolds	Pendlebury Manchester	501-1,000	55	12
22	Stack360	London	51-200	54	7
23	Loginet International	London	51-200	52	4
24	Insight International UK LTD	London	51-200	49	11
25	Theodo UK	E London	51-200	45	8

Showing 25 of 2,918 custom software development companies based in the United Kingdom

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Custom software development companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 1039 HQs

1,312Contacts with mobile numbers

14Emails re-verified in last 30 days

Companies by employee count

1-10

1,764

11-50

854

51-200

206

201-500

501-1,000

1,001-5,000

5,001-10,000

Custom software development companies by metro

Metro	Companies
Custom software development companies in London	1039
Custom software development companies in Manchester	100
Custom software development companies in Birmingham	67
Custom software development companies in Bristol	40
Custom software development companies in Glasgow	34
Custom software development companies in Leeds	32
Custom software development companies in Edinburgh	30

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 “custom software development 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; 14 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 custom software development companies are there based in the United Kingdom?

There are 2,918 custom software development companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Andersen LAB, headquartered in London, tops this list with the largest team on record.

Which city has the most custom software development companies?

London leads with 1039 headquartered companies, followed by Manchester (100) and Birmingham (67).

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 6,428 verified decision-maker contacts tracked across these 2,918 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.