Company lists · Data refreshed September 2026

Top 25 Accounting software services based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 281 companies tracked

RevenueBase identified 281 accounting software services headquartered in London, United Kingdom as of September 2026 and tracks 1,947 professional contacts across them, including 643 with verified work emails. London is the largest hub.

This list covers accounting software services 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 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

281Companies

1,947Contacts tracked

643Verified emails

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The 25 largest accounting software services based in London, United Kingdom

Ranked by team size

Top 25 of 281 accounting software services based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to accounting software services: 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 21, 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 21, 2026
2	Sapphire Info Solutions P LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	88 contacts →
	Partial evidence “Sapphire is an accounting outsourcing company set up for accounting firms in UK and is based in India.” Source: RevenueBase Database · checked Sep 21, 2026
3	kpi.com	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	87 contacts →
	Partial evidence “KPI is an all-in-one business solution providing: Accounting, Payroll, Sales, Human Resources, Project Management, Report and Document applications all in one platform according…” Source: RevenueBase Database · checked Sep 21, 2026
4	Capium	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	81 contacts →
	Strong evidence “Capium is an online accounting & practice management software, tailored specifically for accounting practices.” Source: RevenueBase Database · checked Sep 21, 2026
5	Poklyk	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	68 contacts →
	Partial evidence “Poklyk, a European based company, develops and provides business management software products and services for micro, small, medium enterprises and self-employed professionals in…” Source: RevenueBase Database · checked Sep 21, 2026
6	NOMI	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	62 contacts →
	Partial evidence “Nomi is the ultimate cloud accounting suite built for accountants and bookkeepers.” Source: RevenueBase Database · checked Sep 21, 2026
7	Adroit Accountax LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	51 contacts →
	Indirect evidence “Empowering Businesses to Thrive Through Financial Clarity \| Adroit Accountax We're a team of passionate and experienced accountants dedicated to your business success.” Source: RevenueBase Database · checked Sep 21, 2026
8	Novabook	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	46 contacts →
	Indirect evidence “As founders who've scaled startups, we understand the tax, payroll and finance challenges firsthand.” Source: RevenueBase Database · checked Sep 21, 2026
9	Ascendant	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	40 contacts →
	Partial evidence “Accounting.” Source: RevenueBase Database · checked Sep 21, 2026
10	Pennybooks Limited	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	35 contacts →
	Partial evidence “We’re PennyBooks, a refreshingly modern, London based accounting firm, supporting a broad range of clients from single director freelancers through to scale up VC backed…” Source: RevenueBase Database · checked Sep 21, 2026
11	Acting Office	Partial evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
12	Jump Accounting	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	35 contacts →
	Partial evidence “Accounting for Startups.” Source: RevenueBase Database · checked Sep 21, 2026
13	EMBER	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	32 contacts →
	Strong evidence “Ember is a specialist accounting and tax software platform and was acquired by Starling Bank in 2025.” Source: RevenueBase Database · checked Sep 21, 2026
14	Bookcheck LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
15	Addition	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	27 contacts →
	Indirect evidence “At Addition Finance, we're revolutionising the landscape of business finance on a global scale.” Source: RevenueBase Database · checked Sep 21, 2026
16	Affotax	Partial evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
17	Zmartly	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	18 contacts →
	Partial evidence “What would your ideal accounting service give you?” Source: RevenueBase Database · checked Sep 21, 2026
18	Excelsious	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	16 contacts →
	Partial evidence “Excelsious provides accounting, bookkeeping and finance function outsourcing services to accountancy firms and small to medium enterprises.” Source: RevenueBase Database · checked Sep 21, 2026
19	AIS Accountants Limited, Suite 4 , 34a Waterloo Road, London, Nw2 7uh	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	15 contacts →
	Indirect evidence “AIS Accountants are business tacticians for growth providing accountancy and business services to a range of aspiring SMEs and individuals.” Source: RevenueBase Database · checked Sep 21, 2026
20	Mindspace Outsourcing Limited	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	14 contacts →
	Partial evidence “Mindspace Outsourcing offers bookkeeping outsourcing and accounting outsourcing services to Businesses and CPA Firms in the UK.” Source: RevenueBase Database · checked Sep 21, 2026
21	Chariot House LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	12 contacts →
	Indirect evidence “At Chariot House, we specialize in supporting small to medium-sized organisations in managing their finances more efficiently and with greater simplicity.” Source: RevenueBase Database · checked Sep 21, 2026
22	Sakura Business Solutions LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	12 contacts →
	Indirect evidence “We are Entrepreneur & SME Accountants and Business Advisors, and help our Clients with how to - make the RIGHT decision(s) at the RIGHT time on their business with up to date…” Source: RevenueBase Database · checked Sep 21, 2026
23	Integro Accounting LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “Integro Accounting provide fixed fee limited company accountancy services to contractors, freelancers and consultants.” Source: RevenueBase Database · checked Sep 21, 2026
24	AMS Admin Services	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “AMS Admin Services: Accounting Made Simple At AMS Admin Services, we are dedicated to making accounting and financial management effortless and efficient for a wide array of…” Source: RevenueBase Database · checked Sep 21, 2026
25	Obox Accounting LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “OBOX ACCOUNTING LTD is a consumer services company based out of UNIT 8 DOCK OFFICES SURREY QUAYS ROAD, LONDON, United Kingdom.” 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: accounting software services. 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 services.
Partial evidence: Its own public description names part of accounting software services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name accounting software services. 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 281 accounting software services based in London, United Kingdom

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Accounting software services based in London, United Kingdom at a glance

As of Sep 21, 2026

33.0%Verified-email coverage

6.9Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

209

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 281 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 services, 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 software services”. 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 services), 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 services, 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, 643 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.

Accounting software services by metro in the United Kingdom

Accounting software services in London281
Accounting software services in Manchester32
Accounting software services in Bristol28

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 services, 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 services are there based in London, United Kingdom?

RevenueBase identified 281 accounting software services 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 software services?

London leads with 281 headquartered companies, followed by Manchester (32) and Bristol (28).

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 643 verified decision-maker contacts tracked across these 281 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.

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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.