Company lists · Data refreshed September 2026

Top 24 Application modernisation companies based in the United Kingdom

Name: Application modernisation 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 21, 2026 286 companies tracked

RevenueBase identified 286 application modernisation companies headquartered in the United Kingdom as of September 2026 and tracks 5,560 professional contacts across them, including 1,492 with verified work emails. London is the largest hub.

This list covers application modernisation 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 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

286Companies

5,560Contacts tracked

1,492Verified emails

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

The 24 largest application modernisation companies based in the United Kingdom

Ranked by team size

Top 24 of 286 application modernisation companies 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 application modernisation 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	The Adaptavist Group	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	254 contacts →
	Indirect evidence “We are experts at delivering innovative software, tailored solutions, and quality services across some of the world's most trusted technology ecosystems, including Atlassian, AWS…” Source: RevenueBase Database · checked Sep 21, 2026
2	Dreams Technologies, UK & India	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	221 contacts →
	Indirect evidence “At Dreams Technologies, we’re more than software engineers, we’re digital transformation partners.” Source: RevenueBase Database · checked Sep 21, 2026
3	Leighton	Partial evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 21, 2026	51-200	201 contacts →
	Partial evidence “Leighton is a software development business that builds high performing teams and develops successful software applications for its customers.” Source: RevenueBase Database · checked Sep 21, 2026
4	ONE Beyond	Indirect evidence	Farnborough, United KingdomHQ checked Sep 21, 2026	201-500	185 contacts →
	Indirect evidence “We build software solutions, partnering with ambitious clients looking to grow by harnessing next-generation technology.” Source: RevenueBase Database · checked Sep 21, 2026
5	Codurance	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	176 contacts →
	Indirect 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 21, 2026
6	Contino, A Cognizant Company	Indirect evidence	Liverpool Street, United KingdomHQ checked Sep 21, 2026	201-500	158 contacts →
	Indirect evidence “Contino joined the Cognizant family in 2019.” Source: RevenueBase Database · checked Sep 21, 2026
7	Opinov8	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
8	Daemon	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	145 contacts →
	Indirect evidence “Founded in 2007, Daemon is a technology consultancy with a mission to make the world a better place by creating movements that power digital transformation.” Source: RevenueBase Database · checked Sep 21, 2026
9	Intagleo Systems	Indirect evidence	Slough, United KingdomHQ checked Sep 21, 2026	51-200	138 contacts →
	Indirect evidence “For over 22 years, Intagleo has been a trusted partner for businesses worldwide and US Primes, empowering them to achieve their digital transformation goals through innovative…” Source: RevenueBase Database · checked Sep 21, 2026
10	Infosight Consulting	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	121 contacts →
	Indirect evidence “At Infosight, we architect the future of enterprises by engineering your digital core and activating the intelligence within.” Source: RevenueBase Database · checked Sep 21, 2026
11	Neosalpha Technologies	Indirect evidence	Maidenhead, United KingdomHQ checked Sep 21, 2026	51-200	97 contacts →
	Indirect evidence “NeosAlpha: Your Trusted Partner in IT Consulting and Digital Transformation Founded in the UK in 2017, NeosAlpha is a niche IT consulting and services company, that delivers…” Source: RevenueBase Database · checked Sep 21, 2026
12	Craftsmen	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	85 contacts →
	Indirect evidence “Craftsmen helps companies modernize products, engineering workflows, and digital operations for the AI era.” Source: RevenueBase Database · checked Sep 21, 2026
13	Clurgo	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	76 contacts →
	Indirect evidence “Clurgo empowers global enterprises and early ventures to deliver software at higher velocity and better quality.” Source: RevenueBase Database · checked Sep 21, 2026
14	Vjsar Consultant Service LTD	Indirect evidence	Wallington, United KingdomHQ checked Sep 21, 2026	51-200	76 contacts →
	Indirect evidence “VJSAR is a trusted IT solutions and services provider, offering specialised expertise across Microsoft Azure, Google Cloud Platform, and Amazon Web Services.” Source: RevenueBase Database · checked Sep 21, 2026
15	KLOIA	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	75 contacts →
	Partial evidence “Kloia is an AWS Premier Tier Services Partner that specializes in DevOps/Cloud, Application Modernization, Software Testing and Generative AI.” Source: RevenueBase Database · checked Sep 21, 2026
16	unipro.io	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	71 contacts →
	Indirect 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 21, 2026
17	Versatile Commerce	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 21, 2026	51-200	64 contacts →
	Indirect evidence “Versatile Commerce is an innovative bespoke software development company headquartered in the UK, with offices in the US and India.” Source: RevenueBase Database · checked Sep 21, 2026
18	Codex Software	Indirect evidence	Cirencester, United KingdomHQ checked Sep 21, 2026	51-200	63 contacts →
	Indirect evidence “Codex makes software simple, strategic, and reliable.” Source: RevenueBase Database · checked Sep 21, 2026
19	Estafet	Indirect evidence	Richmond, United KingdomHQ checked Sep 21, 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 21, 2026
20	Cloudplexo	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	54 contacts →
	Indirect evidence “CloudPlexo is a global technology consulting firm helping organizations transform, innovate, and build resilience through Cloud, AI, and Cybersecurity.” Source: RevenueBase Database · checked Sep 21, 2026
21	Diegesis Limited	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	52 contacts →
	Indirect evidence “Diegesis is a business technology and IT systems integration company that specialises in Decision Support Solutions.” Source: RevenueBase Database · checked Sep 21, 2026
22	Hunter Macdonald LTD	Indirect evidence	Reading, United KingdomHQ checked Sep 21, 2026	1,001-5,000	52 contacts →
	Indirect evidence “Hunter Macdonald is now a part of Netcompany - the fastest growing and most successful IT service company in Europe.” Source: RevenueBase Database · checked Sep 21, 2026
23	Eclature Technologies	Indirect evidence	Daresbury, United KingdomHQ checked Sep 21, 2026	201-500	50 contacts →
	Indirect evidence “Eclature Technologies stands for engineering innovation, excellence, and reliability.” Source: RevenueBase Database · checked Sep 21, 2026
24	Theodo UK	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	46 contacts →
	Indirect evidence “Theodo was founded 14 years ago and comprises 700 employees across offices in London, Paris, New York, Casablanca and Cape Town.” 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: application modernisation 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 modernisation companies.
Partial evidence: Its own public description names part of application modernisation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name application modernisation 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 24 of 286 application modernisation companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,492 reachable decision-makers.

Free signup · no credit card

View the full list →

Application modernisation companies based in the United Kingdom at a glance

As of Sep 21, 2026

26.8%Verified-email coverage

19.4Average contacts per company

11-50Median size (employees)

42.3%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

142

11-50

51-200

201-500

1,001-5,000

10001+

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 286 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 modernisation 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 modernisation 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 modernisation 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 modernisation 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, 1,492 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.

Application modernisation companies by metro

Application modernisation companies in London121

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 modernisation 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 modernisation companies are there based in the United Kingdom?

RevenueBase identified 286 application modernisation 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?

The Adaptavist Group, headquartered in London, tops this list with the largest team on record.

Which city has the most application modernisation companies?

London leads with 121 headquartered companies, followed by Manchester (9) and Leeds (5).

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 1,492 verified decision-maker contacts tracked across these 286 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 286 application modernisation companies based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Application modernisation companies 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.