Company lists · Data refreshed September 2026

Top 25 Accounting integration companies based in London, United Kingdom

Name: Accounting integration 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 22, 2026 78 companies tracked

RevenueBase identified 78 accounting integration companies headquartered in London, United Kingdom as of September 2026 and tracks 913 professional contacts across them, including 361 with verified work emails and 69 with mobile numbers. London is the largest hub.

This list covers accounting integration 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 22, 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 22, 2026 86% judged on-target in blind review

78Companies

913Contacts tracked

361Verified emails

69Mobile numbers

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The 25 largest accounting integration companies based in London, United Kingdom

Ranked by team size

Top 25 of 78 accounting integration companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to accounting integration 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	Aptitude Software	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	501-1,000	304 contacts →
	Indirect 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 22, 2026
2	Accounts And Legal	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	133 contacts →
	Indirect evidence “Traditional accountants do a great job of the numbers, but that's often as far as the service goes.” Source: RevenueBase Database · checked Sep 22, 2026
3	Validis	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	61 contacts →
	Indirect evidence “Validis - We get financial data.” Source: RevenueBase Database · checked Sep 22, 2026
4	Stellaripe	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	58 contacts →
	Indirect evidence “We are on a mission to help accountants to grow their accountancy practice and become more profitable.” Source: RevenueBase Database · checked Sep 22, 2026
5	Acting Office	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	35 contacts →
	Indirect 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 22, 2026
6	Bookcheck LTD	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	29 contacts →
	Indirect evidence “Our clients rely on us to remove book-keeping hassle and improve their profitability by using our top quality financial reports based on professionally reconciled book-keeping.” Source: RevenueBase Database · checked Sep 22, 2026
7	Turbosoft Limited	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	26 contacts →
	Indirect evidence “We connect your CRM, ERP, AI and Cloud systems, bridging internal platforms and external tools so your data flows cleanly, your processes run automatically, and your business…” Source: RevenueBase Database · checked Sep 22, 2026
8	Affotax	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	22 contacts →
	Partial evidence “Simplified Online Accounting \| Customized Bookkeeping \| Expert Payroll Services Making Finances Easier: Welcome to AffoTax.com, where we're changing how small businesses handle…” Source: RevenueBase Database · checked Sep 22, 2026
9	Mayday	Partial evidence	London, United KingdomHQ checked Sep 22, 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 22, 2026
10	Hibooks	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	13 contacts →
	Indirect evidence “At hibooks, we believe that the true potential of any business lies in the ability to focus on its core vision without being bogged down by the intricacies of financial management.” Source: RevenueBase Database · checked Sep 22, 2026
11	CLIC	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	9 contacts →
	Indirect evidence “Own a small business?” Source: RevenueBase Database · checked Sep 22, 2026
12	PI Accounting LTD	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	9 contacts →
	Indirect evidence “Virtual and in-house accountancy services provider for professional, media and financial services companies in London since 2010.” Source: RevenueBase Database · checked Sep 22, 2026
13	4pointzero	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	8 contacts →
	Indirect evidence “4PointZero is an international technology and advisory company that specialises in the implementation of cloud-based accountancy services.” Source: RevenueBase Database · checked Sep 22, 2026
14	Ledgerscope	Partial evidence	London, United KingdomHQ checked Sep 22, 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 22, 2026
15	Millet	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	6 contacts →
	Indirect evidence “Accountants for business success - startup, growth, challenges and exit” Source: RevenueBase Database · checked Sep 22, 2026
16	Connectorly	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	3 contacts →
	Indirect evidence “Connectorly lets you quickly connect the common systems used to run an SME business without having to figure out what to integrate, write code, or worry if it's still working.” Source: RevenueBase Database · checked Sep 22, 2026
17	The Zane Partnership	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	2 contacts →
	Indirect evidence “The Zane Partnership specializes in- Auditing Accounts Preparation and Reporting Payroll Processing PAYE Compliance and Bookkeeping Tax Planning Self Assessment Monthly Or…” Source: RevenueBase Database · checked Sep 22, 2026
18	Evolution Dynamic LTD	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	2 contacts →
	Indirect evidence “At Evolution Dynamic our mission is to provide solutions for financial process efficiency to our customers.” Source: RevenueBase Database · checked Sep 22, 2026
19	Prosper	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	2 contacts →
	Partial evidence “Bookkeeping & Accounting + Reporting & Analysis Prosper works with companies across the UK & Ireland.” Source: RevenueBase Database · checked Sep 22, 2026
20	MM Consultinghouse Limited	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	2 contacts →
	Indirect evidence “With over a decade of specialist experience, MM Consultinghouse helps small and mid-sized hospitality businesses simplify their finances and achieve growth through traditional…” Source: RevenueBase Database · checked Sep 22, 2026
21	Xena Accounting UK	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	2 contacts →
	Partial evidence “Here at Xena Accounting, you will find a team of accountants who like to keep it simple and stress-free.” Source: RevenueBase Database · checked Sep 22, 2026
22	Just Accountants	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	1 contacts →
	Indirect evidence “As the UK’s leading accountancy introducer we have a vast panel of qualified accountants across the UK.” Source: RevenueBase Database · checked Sep 22, 2026
23	UNIFY	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	1 contacts →
	Indirect evidence “Consolidate financials across all your businesses for easy & accurate reporting.” Source: RevenueBase Database · checked Sep 22, 2026
24	5 Rivers Accountancy	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	1 contacts →
	Partial evidence “5 RIVERS ACCOUNTANCY LTD is an accounting company working with companies looking to grow.” Source: RevenueBase Database · checked Sep 22, 2026
25	Camden Accounting LTD	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	1 contacts →
	Partial evidence “CAMDEN ACCOUNTING LTD is an accounting company based out of United Kingdom.” Source: RevenueBase Database · checked Sep 22, 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 integration 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 accounting integration companies.
Partial evidence: Its own public description names part of accounting integration companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name accounting integration 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 78 accounting integration companies based in London, United Kingdom

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Accounting integration companies based in London, United Kingdom at a glance

As of Sep 22, 2026

39.5%Verified-email coverage

7.6%Mobile-number coverage

11.7Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

Freshness & accuracy

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

Email last verified

Median 25.0d

2650–30

7731–60

461–90

090–180

15180+

Company record updated

Median 76.0d

00–30

18931–60

46361–90

19790–180

64180+

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 integration 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 “accounting integration 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 accounting integration 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 accounting integration 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, 361 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 22, 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.

Accounting integration companies by metro in the United Kingdom

Accounting integration companies in London78

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 integration 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 accounting integration companies are there based in London, United Kingdom?

RevenueBase identified 78 accounting integration 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?

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

Which city has the most accounting integration companies?

London leads with 78 headquartered companies, followed by Manchester (10) and Bristol (8).

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 361 verified decision-maker contacts tracked across these 78 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 22, 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.