Company lists · Data refreshed September 2026

Top 25 Application modernization software companies based in the United Kingdom

Name: Application modernization software companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 115 companies tracked

RevenueBase identified 115 application modernization software companies headquartered in the United Kingdom as of September 2026 and tracks 1,144 professional contacts across them, including 431 with verified work emails. London is the largest hub.

This list covers application modernization software 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 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 27, 2026 86% judged on-target in blind review

115Companies

1,144Contacts tracked

431Verified emails

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The 25 largest application modernization software companies based in the United Kingdom

Ranked by team size

Top 25 of 115 application modernization software companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to application modernization software 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	Codurance	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	176 contacts →
	Partial evidence “For over 13 years, Codurance has helped businesses and their boards solve complex software challenges, often the ones that have resisted previous attempts and now carry real…” Source: RevenueBase Database · checked Sep 27, 2026
2	Macro 4	Strong evidence	Crawley, United KingdomHQ checked Sep 27, 2026	201-500	134 contacts →
	Strong evidence “Macro 4, a division of UNICOM Global, provides software solutions for customer communications, information management, application decommissioning, mainframe modernization and…” Source: RevenueBase Database · checked Sep 27, 2026
3	Clurgo	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	76 contacts →
	Partial evidence “Clurgo empowers global enterprises and early ventures to deliver software at higher velocity and better quality.” Source: RevenueBase Database · checked Sep 27, 2026
4	Codex Software	Partial evidence	Cirencester, United KingdomHQ checked Sep 27, 2026	51-200	63 contacts →
	Partial evidence “Codex makes software simple, strategic, and reliable.” Source: RevenueBase Database · checked Sep 27, 2026
5	Estafet	Indirect evidence	Richmond, United KingdomHQ checked Sep 27, 2026	51-200	56 contacts →
	Indirect evidence “At Estafet, we don’t just optimize processes - we revolutionize how enterprises operate.” Source: RevenueBase Database · checked Sep 27, 2026
6	Cloudhouse	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	50 contacts →
	Indirect evidence “Cloudhouse Change is the common root cause of failure.” Source: RevenueBase Database · checked Sep 27, 2026
7	Propel Tech	Indirect evidence	Wakefield, United KingdomHQ checked Sep 27, 2026	51-200	36 contacts →
	Indirect evidence “As experts across new and legacy technologies we make possibilities happen to move business forward.” Source: RevenueBase Database · checked Sep 27, 2026
8	Flynet	Indirect evidence	Burwell, United KingdomHQ checked Sep 27, 2026	11-50	32 contacts →
	Indirect evidence “Since 1995 Flynet have been building some of the industry's most sophisticated web based solutions for Mainframe, Unix, IBM i, VMS, VAX and MultiValue systems.” Source: RevenueBase Database · checked Sep 27, 2026
9	Camwood	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	31 contacts →
	Indirect evidence “Camwood: Igniting Enterprise Innovation for 25 Years.” Source: RevenueBase Database · checked Sep 27, 2026
10	Brilino Solutions Private Limited	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	24 contacts →
	Partial evidence “BRILINO SOLUTIONS is a high end business application development company providing bespoke business solutions for enterprise customers.” Source: RevenueBase Database · checked Sep 27, 2026
11	Styletech Solutions Limited	Partial evidence	Hessle, United KingdomHQ checked Sep 27, 2026	11-50	19 contacts →
	Partial evidence “At StyleTech, we specialise in bespoke software that’s built around your business.” Source: RevenueBase Database · checked Sep 27, 2026
12	Querix	Indirect evidence	Southampton, United KingdomHQ checked Sep 27, 2026	11-50	11 contacts →
	Indirect evidence “We have been working in various areas of 4GL, ESQL/C, DBMS (Informix, Oracle, MS SQL Server, PostgreSQL, Db2, etc.), data migration and transformation for over 20 years now.” Source: RevenueBase Database · checked Sep 27, 2026
13	Migrationware	Partial evidence	Reading, United KingdomHQ checked Sep 27, 2026	11-50	10 contacts →
	Partial evidence “MigrationWare is a solutions company dedicated to the preservation and protection of the life expectancy of business applications threatened by obsolete technology, as well as by…” Source: RevenueBase Database · checked Sep 27, 2026
14	Bluebox Software	Partial evidence	Worcester, United KingdomHQ checked Sep 27, 2026	11-50	9 contacts →
	Partial evidence “For over 20 years, we’ve partnered with ambitious start-ups, growing SMEs and established enterprises to design software that does more than just “work.” We solve complex…” Source: RevenueBase Database · checked Sep 27, 2026
15	Igent AI	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	1-10	9 contacts →
	Partial evidence “iGent AI brings engineering intelligence to software development.” Source: RevenueBase Database · checked Sep 27, 2026
16	True9	Indirect evidence	Saltaire, United KingdomHQ checked Sep 27, 2026	11-50	8 contacts →
	Indirect evidence “True9 is a technology consultancy grounded in real-world delivery.” Source: RevenueBase Database · checked Sep 27, 2026
17	Application Readiness	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	6 contacts →
	Partial evidence “Readiness is the world’s first entirely web-based, dynamic, on-demand system for automatic application assessment, remediation and conversion of an enterprise’s entire portfolio…” Source: RevenueBase Database · checked Sep 27, 2026
18	H3o Business Technologies	Indirect evidence	Peterborough, United KingdomHQ checked Sep 27, 2026	11-50	6 contacts →
	Indirect evidence “Welcome to H3O Business Technologies At H3O Business Technologies, we spearhead the transformation of traditional business operations with our leadership in advanced MultiValue…” Source: RevenueBase Database · checked Sep 27, 2026
19	Ternary Technology Limited	Indirect evidence	Thames Valley Park, United KingdomHQ checked Sep 27, 2026	11-50	6 contacts →
	Indirect evidence “Enterprise transformation is at the heart of what we do.” Source: RevenueBase Database · checked Sep 27, 2026
20	Legacy BOX LTD	Strong evidence	Stockport, United KingdomHQ checked Sep 27, 2026	11-50	6 contacts →
	Strong evidence “Legacy Box is a Microsoft co-sell approved ("Preferred Solution") vendor created by a group of skilled and accredited software developers working in the Windows application space.” Source: RevenueBase Database · checked Sep 27, 2026
21	Devroom	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	1-10	6 contacts →
	Partial evidence “At DevRoom we deliver high-quality software solutions tailored to your business.” Source: RevenueBase Database · checked Sep 27, 2026
22	R4apps Limited	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	6 contacts →
	Indirect evidence “At r4apps, we are dedicated to helping companies overcome their digital challenges with ease.” Source: RevenueBase Database · checked Sep 27, 2026
23	Roll Studio	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	6 contacts →
	Partial evidence “We transform legacy software into beautifully-crafted, market-leading solutions.” Source: RevenueBase Database · checked Sep 27, 2026
24	Redox Software LTD	Partial evidence	Banbury, United KingdomHQ checked Sep 27, 2026	1-10	5 contacts →
	Partial evidence “Software hampering your progress?” Source: RevenueBase Database · checked Sep 27, 2026
25	Biff Bang POW Limited	Partial evidence	Solihull, United KingdomHQ checked Sep 27, 2026	1-10	5 contacts →
	Partial evidence “Biff Bang Pow Limited are a software company focusing on automating and simplifying complex legacy business tasks.” Source: RevenueBase Database · checked Sep 27, 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: application modernization software 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 application modernization software companies.
Partial evidence: Its own public description names part of application modernization software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name application modernization software 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 115 application modernization software companies based in the United Kingdom

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Application modernization software companies based in the United Kingdom at a glance

As of Sep 27, 2026

37.7%Verified-email coverage

9.9Average contacts per company

1-10Median size (employees)

32.2%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 115 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 application modernization software 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 the United Kingdom whose own description of what they do matches “application modernization software 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 application modernization software 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 application modernization software companies, 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, 431 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 27, 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.

Application modernization software companies by metro

Application modernization software companies in London37

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 application modernization software 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 application modernization software companies are there based in the United Kingdom?

RevenueBase identified 115 application modernization software companies 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?

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

Which city has the most application modernization software companies?

London leads with 37 headquartered companies, followed by Manchester (5) and Glasgow (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 431 verified decision-maker contacts tracked across these 115 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 27, 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.