Company lists · Data refreshed September 2026

Top 25 Custom software development companies based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 9, 2026 1,559 companies tracked

RevenueBase identified 1,559 custom software development companies headquartered in London, United Kingdom as of September 2026 and tracks 14,650 professional contacts across them, including 1,498 with verified work emails and 725 with mobile numbers. London is the largest hub.

This list covers custom software development 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 9, 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 9, 2026 86% judged on-target in blind review

1,559Companies

14,650Contacts tracked

1,498Verified emails

725Mobile numbers

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The 25 largest custom software development companies based in London, United Kingdom

Ranked by team size

Top 25 of 1,559 custom software development companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 9, 2026. RevenueBase Smart Search rates how each company's information relates to custom software development companies: 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	Dotsquares	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	501-1,000	1,581 contacts →
	Indirect evidence “We leverage the latest web and mobile technologies to build, grow and support your business.” Source: RevenueBase Database · checked Sep 9, 2026
2	SENLA	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	501-1,000	515 contacts →
	Partial evidence “In 2012, SENLA set out with a vision: to transform people's lives with exceptional software.” Source: RevenueBase Database · checked Sep 9, 2026
3	Dreams Technologies, UK & India	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	201-500	221 contacts →
	Partial evidence “At Dreams Technologies, we’re more than software engineers, we’re digital transformation partners.” Source: RevenueBase Database · checked Sep 9, 2026
4	KRIFY	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	221 contacts →
	Partial evidence “Krify is a results-driven technology company specializing in crafting user-centric mobile apps, web applications, and software solutions.” Source: RevenueBase Database · checked Sep 9, 2026
5	Magora	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	213 contacts →
	Strong evidence “Magora is an international software development company with 12 years of extensive experience in bespoke development outsourcing market.” Source: RevenueBase Database · checked Sep 9, 2026
6	scrums.com	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	201-500	163 contacts →
	Partial evidence “Scrums.com is the Software Engineering Orchestration Platform (SEOP).” Source: RevenueBase Database · checked Sep 9, 2026
7	Digis, A Fiverr Company Nyse Fvrr	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	201-500	163 contacts →
	Strong evidence “Digis is a leading software development company with a team of over.” Source: RevenueBase Database · checked Sep 9, 2026
8	Opinov8	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	201-500	154 contacts →
	Indirect evidence “Winner of the Best AI Company Award by The Netty Awards · Headquartered in London, powered by a worldwide team of engineers across Europe, Egypt, and the Americas.” Source: RevenueBase Database · checked Sep 9, 2026
9	Synycs Group	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	201-500	132 contacts →
	Strong evidence “Incorporated in 2014 and headquartered in the UK, Synycs Group is a CMMI Level 4 industry-leading & most reliable software and mobile app development company known for delivering…” Source: RevenueBase Database · checked Sep 9, 2026
10	Hybytes	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	201-500	79 contacts →
	Indirect evidence “Hybytes is an offshore/domestic solution provider for IT and Management to business and industry.” Source: RevenueBase Database · checked Sep 9, 2026
11	Turn UP Technologies	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	74 contacts →
	Indirect evidence “Turn Up Technologies is a digital growth IT firm headquartered in London, UK with offices across the Texas, UAE, Canada, and Pakistan.” Source: RevenueBase Database · checked Sep 9, 2026
12	Timspark	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	73 contacts →
	Strong evidence “Timspark is a software development company/hub that creates custom software solutions to fit clients’ business needs.” Source: RevenueBase Database · checked Sep 9, 2026
13	unipro.io	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	71 contacts →
	Strong evidence “Unipro is a bespoke software studio that creates custom solutions to solve the most complex digital transformation challenges, giving our clients unparalleled control and lasting…” Source: RevenueBase Database · checked Sep 9, 2026
14	Agile Cyber Solutions	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	69 contacts →
	Strong evidence “Agile Cyber Solutions is a company providing software services which prides itself as an understanding IT partner for various product development companies, large portals…” Source: RevenueBase Database · checked Sep 9, 2026
15	3i-Vision	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	60 contacts →
	Strong evidence “3i-Vision company was Founded in 2012, 3i-Vision is a provider of IT consulting services and custom software development with IT professionals.” Source: RevenueBase Database · checked Sep 9, 2026
16	Gemba Advantage	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	59 contacts →
	Partial evidence “Gemba Advantage make high-impact software that is secure, scalable and sustainable.” Source: RevenueBase Database · checked Sep 9, 2026
17	Aircury	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	55 contacts →
	Strong evidence “Aircury offers high quality software development for the education and non-profit sectors We specialise in- Full-stack application development for web and mobile- API and…” Source: RevenueBase Database · checked Sep 9, 2026
18	Impressit	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	54 contacts →
	Indirect evidence “A premium digital agency with an in-house team of tech experts, who build SaaS products, mobile and web applications for SMEs by using clean processes and the latest technologies…” Source: RevenueBase Database · checked Sep 9, 2026
19	Satva Softech	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	53 contacts →
	Indirect evidence “Established in 2015, SATVA Softech has carved a distinguished niche in the global technology landscape.” Source: RevenueBase Database · checked Sep 9, 2026
20	Warrgyizmorsch	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	51 contacts →
	Indirect evidence “Tailored ERP, CRM & SaaS that automates your operations and fuels measurable growth.” Source: RevenueBase Database · checked Sep 9, 2026
21	Insight International UK LTD	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	50 contacts →
	Strong evidence “We provide Software Development, Maintenance and Other Related IT Services, across spectrum, depending on individual client’s needs and dependability on us.” Source: RevenueBase Database · checked Sep 9, 2026
22	10qbit	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	46 contacts →
	Indirect evidence “There are many Tech Solution companies out there.” Source: RevenueBase Database · checked Sep 9, 2026
23	SKO Systems	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	45 contacts →
	Partial evidence “At SKO Systems, we engineer enterprise-grade software ecosystems designed for the unique, high-stakes realities of the maritime environment.” Source: RevenueBase Database · checked Sep 9, 2026
24	Unibrix	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	44 contacts →
	Partial evidence “Unibrix provides web and app development services for clients all over the world.” Source: RevenueBase Database · checked Sep 9, 2026
25	QTECH	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	43 contacts →
	Indirect evidence “Over 25 years of experience; over projects delivered and clients in 10 different countries.” Source: RevenueBase Database · checked Sep 9, 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: custom software development companies. 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 custom software development companies.
Partial evidence: Its own public description names part of custom software development companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom software development companies. 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 1,559 custom software development companies based in London, United Kingdom

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Custom software development companies based in London, United Kingdom at a glance

As of Sep 9, 2026

10.2%Verified-email coverage

4.9%Mobile-number coverage

9.4Average contacts per company

1-10Median size (employees)

66.6%Largest-city concentration · London

Sep 9, 2026Page data refreshed

Companies by employee count

1-10

854

11-50

555

51-200

108

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 12.0d

1,3690–30

11031–60

061–90

090–180

19180+

Company record updated

Median 74.0d

00–30

6,12831–60

6,34861–90

1,43190–180

743180+

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 custom software development companies, 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 London, United Kingdom whose own description of what they do matches “custom software development companies”. 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 custom software development companies), 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 custom software development companies, and records with no verified work email. Companies headquartered outside London 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, 1,498 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 9, 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.

Custom software development companies by metro in the United Kingdom

Custom software development companies in London1039
Custom software development companies in Manchester100
Custom software development companies in Birmingham67
Custom software development companies in Bristol40
Custom software development companies in Glasgow34
Custom software development companies in Leeds32
Custom software development companies in Edinburgh30

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 custom software development companies, 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 custom software development companies are there based in London, United Kingdom?

RevenueBase identified 1,559 custom software development companies headquartered in London, 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?

Dotsquares, 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 1,498 verified decision-maker contacts tracked across these 1,559 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 9, 2026.

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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.