Company lists · Data refreshed September 2026

Top 25 Accounting software integration developers based in the United Kingdom

Name: Accounting software integration developers 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 83 companies tracked

RevenueBase identified 83 accounting software integration developers headquartered in the United Kingdom as of September 2026 and tracks 1,117 professional contacts across them, including 565 with verified work emails. London is the largest hub.

This list covers accounting software integration developers 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

83Companies

1,117Contacts tracked

565Verified emails

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The 25 largest accounting software integration developers based in the United Kingdom

Ranked by team size

Top 25 of 83 accounting software integration developers 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 accounting software integration developers: 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	Aptitude Software	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	501-1,000	304 contacts →
	Partial evidence “Here at Aptitude, we provide software solutions to enable deliver fully autonomous finance so our customers can drive growth, efficiency and sustainability.” Source: RevenueBase Database · checked Sep 27, 2026
2	INFLO	Partial evidence	Houghton Le Spring, United KingdomHQ checked Sep 27, 2026	51-200	156 contacts →
	Partial evidence “Inflo transforms the accounting profession by making leading-edge technologies accessible to all.” Source: RevenueBase Database · checked Sep 27, 2026
3	Taxcalc	Partial evidence	Wokingham, United KingdomHQ checked Sep 27, 2026	51-200	101 contacts →
	Partial evidence “The complete tax and accountancy practice software suite, powered by a single database.” Source: RevenueBase Database · checked Sep 27, 2026
4	Eureka Solutions Scotland LTD	Indirect evidence	East Kilbride, United KingdomHQ checked Sep 27, 2026	51-200	64 contacts →
	Indirect evidence “At Eureka Solutions, we specialise in implementing powerful cloud-based systems that have the potential to revolutionise your business.” Source: RevenueBase Database · checked Sep 27, 2026
5	Itas Solutions	Indirect evidence	Chester, United KingdomHQ checked Sep 27, 2026	11-50	44 contacts →
	Indirect evidence “Big enough for best-in-class support but small enough for your undivided attention, itas invests in your long-term success.” Source: RevenueBase Database · checked Sep 27, 2026
6	ION	Partial evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 27, 2026	11-50	43 contacts →
	Partial evidence “ION implements cloud accounting solutions into Education, high-growth and PE-backed organisations.” Source: RevenueBase Database · checked Sep 27, 2026
7	Iris Accountancy	Strong evidence	Slough, United KingdomHQ checked Sep 27, 2026	1,001-5,000	42 contacts →
	Strong evidence “IRIS is a long-established industry leader in accounting software and services for accountants and bookkeepers.” Source: RevenueBase Database · checked Sep 27, 2026
8	Pegasus Software	Strong evidence	Kettering, United KingdomHQ checked Sep 27, 2026	51-200	41 contacts →
	Strong evidence “Pegasus Software is one of the UK's leading suppliers of accounting software, cloud accounting software, business solutions and payroll software and has been for over 30 years.” Source: RevenueBase Database · checked Sep 27, 2026
9	Acting Office	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	35 contacts →
	Partial evidence “At Acting Office we deliver a fully integrated software platform designed for modern accountancy practices that want precision, efficiency and complete visibility across their…” Source: RevenueBase Database · checked Sep 27, 2026
10	ZYNK	Strong evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 27, 2026	11-50	25 contacts →
	Strong evidence “Zynk is one of leading Integration Platform as a Service providers specializing in accounting data integration.” Source: RevenueBase Database · checked Sep 27, 2026
11	Cindercone Solutions Limited	Strong evidence	Leeds, United KingdomHQ checked Sep 27, 2026	11-50	18 contacts →
	Strong evidence “Cindercone provide integration software and services.” Source: RevenueBase Database · checked Sep 27, 2026
12	Mayday	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	16 contacts →
	Partial evidence “Mayday mends month end for in-house finance teams at complex businesses scaling with Xero or Quickbooks Online as their core accounting system, including those managing multiple…” Source: RevenueBase Database · checked Sep 27, 2026
13	Outserve	Indirect evidence	Stafford, United KingdomHQ checked Sep 27, 2026	11-50	15 contacts →
	Indirect evidence “Grow your profits and make your business better with Outserve.” Source: RevenueBase Database · checked Sep 27, 2026
14	Humony	Indirect evidence	Basingstoke, United KingdomHQ checked Sep 27, 2026	11-50	15 contacts →
	Indirect evidence “With over 30 years’ experience under our belt in helping our valued clients to work smarter, we find business solutions to your problems.” Source: RevenueBase Database · checked Sep 27, 2026
15	Eclipse Group	Partial evidence	Crowborough, United KingdomHQ checked Sep 27, 2026	11-50	13 contacts →
	Partial evidence “Eclipse is an experienced provider of cloud financial management, integration and automation solutions designed to help organisations increase efficiency and maximise business…” Source: RevenueBase Database · checked Sep 27, 2026
16	MYT	Partial evidence	Croydon, United KingdomHQ checked Sep 27, 2026	1-10	12 contacts →
	Partial evidence “MYT Software is the perfect solution for small businesses, freelancers, and accountants looking to streamline their finances and focus on growth.” Source: RevenueBase Database · checked Sep 27, 2026
17	Adaptris	Partial evidence	Sutton, United KingdomHQ checked Sep 27, 2026	51-200	11 contacts →
	Partial evidence “At Adaptris our mantra is Integration Anywhere.” Source: RevenueBase Database · checked Sep 27, 2026
18	Redfish Systems Limited	Partial evidence	Kettering, United KingdomHQ checked Sep 27, 2026	11-50	10 contacts →
	Partial evidence “Innovative software solutions; enhancing business performance At Redfish, our mission is to provide innovative software solutions that support a customer’s business objectives…” Source: RevenueBase Database · checked Sep 27, 2026
19	Somax Finance LTD	Partial evidence	Bristol, United KingdomHQ checked Sep 27, 2026	11-50	9 contacts →
	Partial evidence “Welcome to SoMax Finance – your trusted partner for cutting-edge cloud accounting solutions.” Source: RevenueBase Database · checked Sep 27, 2026
20	Ledgerscope	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	7 contacts →
	Partial evidence “We are a small and nimble fintech company, with unique skills for extracting, understanding and transforming accounting data.” Source: RevenueBase Database · checked Sep 27, 2026
21	Datafile Software Solutions Limited	Strong evidence	Preston, United KingdomHQ checked Sep 27, 2026	11-50	7 contacts →
	Strong evidence “Datafile is accounting software built for businesses that have outgrown off-the-shelf solutions.” Source: RevenueBase Database · checked Sep 27, 2026
22	Anagram Systems LTD	Strong evidence	Horsham, United KingdomHQ checked Sep 27, 2026	11-50	7 contacts →
	Strong evidence “Encore is an integrated stock control and accounting software designed for retail, manufacturing, wholesale and distribution companies in a multitude of industries.” Source: RevenueBase Database · checked Sep 27, 2026
23	Protronics LTD	Indirect evidence	Oxford, United KingdomHQ checked Sep 27, 2026	1-10	6 contacts →
	Indirect evidence “Protronics are Sage 50 and Sage 200 experts.” Source: RevenueBase Database · checked Sep 27, 2026
24	Pastel UK & Ireland	Indirect evidence	Oldham, United KingdomHQ checked Sep 27, 2026	11-50	5 contacts →
	Indirect evidence “How can we help?” Source: RevenueBase Database · checked Sep 27, 2026
25	Orchestr8 Digital LTD	Partial evidence	Altrincham, United KingdomHQ checked Sep 27, 2026	11-50	5 contacts →
	Partial evidence “Your business is running on multiple software platforms.” 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: accounting software integration developers. 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 accounting software integration developers.
Partial evidence: Its own public description names part of accounting software integration developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name accounting software integration developers. 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 83 accounting software integration developers based in the United Kingdom

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Accounting software integration developers based in the United Kingdom at a glance

As of Sep 27, 2026

50.6%Verified-email coverage

13.5Average contacts per company

1-10Median size (employees)

25.3%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

1,001-5,000

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 83 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 accounting software integration developers, 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 “accounting software integration developers”. 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 accounting software integration developers), 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 accounting software integration developers, 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, 565 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.

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 accounting software integration developers, 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 accounting software integration developers are there based in the United Kingdom?

RevenueBase identified 83 accounting software integration developers 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?

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

Which city has the most accounting software integration developers?

London leads with 21 headquartered companies, followed by Manchester (3) and Newcastle Upon Tyne (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 565 verified decision-maker contacts tracked across these 83 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.