Company lists · Data refreshed August 2026

Top 25 Api and integration platform companies based in London, United Kingdom

Name: Api and integration platform companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 45 companies tracked

RevenueBase identified 45 api and integration platform companies headquartered in London, United Kingdom as of August 2026 and tracks 998 professional contacts across them, including 385 with verified work emails and 104 with mobile numbers. London is the largest hub.

This list covers api and integration platform 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 August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

45Companies

998Contacts tracked

385Verified emails

104Mobile numbers

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The 25 largest api and integration platform companies based in London, United Kingdom

Ranked by team size

Top 25 of 45 api and integration platform companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to api and integration platform 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	TYK	Strong evidence	London, United Kingdom	51-200	124 contacts →
	Strong evidence “Tyk is a leading API Management Platform.” Source: RevenueBase Database · checked Aug 31, 2026
2	NTT Ltd. Cloud	Indirect evidence	London, United Kingdom	201-500	112 contacts →
	Indirect evidence “Welcome to the home of NTT Ltd.” Source: RevenueBase Database · checked Aug 31, 2026
3	Xiatech	Indirect evidence	London, United Kingdom	51-200	93 contacts →
	Indirect evidence “Integrate your systems, create a single trusted view of data and access real-time insights – all in one cloud-native solution.” Source: RevenueBase Database · checked Aug 31, 2026
4	Integrella	Indirect evidence	London, United Kingdom	51-200	84 contacts →
	Indirect evidence “Integrella is a specialist IT services company with extensive experience across UK sectors.” Source: RevenueBase Database · checked Aug 31, 2026
5	Infoteck Solutions	Partial evidence	London, United Kingdom	51-200	71 contacts →
	Partial evidence “Infoteck Solutions: Empowering Integration and Automation Welcome to Infoteck Solutions, your trusted partner in seamless integration and efficient automation.” Source: RevenueBase Database · checked Aug 31, 2026
6	Patchworks	Strong evidence	London, United Kingdom	51-200	66 contacts →
	Strong evidence “Patchworks is an enterprise-grade integration and automation platform that helps organisations connect systems, orchestrate workflows and move faster.” Source: RevenueBase Database · checked Aug 31, 2026
7	Pace Integration	Partial evidence	London, United Kingdom	51-200	46 contacts →
	Partial evidence “Pace Integration is a unique technology consultancy that solves your integration challenge – focused on enterprise systems integration strategy, architecture and design that is…” Source: RevenueBase Database · checked Aug 31, 2026
8	ONEIO	Partial evidence	London, United Kingdom	51-200	45 contacts →
	Partial evidence “Most integrations are fine.” Source: RevenueBase Database · checked Aug 31, 2026
9	Turbosoft Limited	Partial evidence	London, United Kingdom	11-50	27 contacts →
	Partial 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 Aug 31, 2026
10	Thinkdata Works	Indirect evidence	London, United Kingdom	51-200	14 contacts →
	Indirect evidence “Data is more available and more diverse than ever, but varied sources, inconsistent formats, and an evolving compliance landscape make it difficult to manage.” Source: RevenueBase Database · checked Aug 31, 2026
11	Cloudorizon	Partial evidence	London, United Kingdom	11-50	12 contacts →
	Partial evidence “At Cloudorizon, we specialise in seamless data and process integrations to boost efficiency and drive growth.” Source: RevenueBase Database · checked Aug 31, 2026
12	Switchboard	Indirect evidence	London, United Kingdom	11-50	12 contacts →
	Indirect evidence “Easily integrate and exchange data with any supply chain system.” Source: RevenueBase Database · checked Aug 31, 2026
13	Quadcorps LTD	Strong evidence	London, United Kingdom	11-50	10 contacts →
	Strong evidence “Your trusted partner for API and Integration Ecosystem transformations - Military precision, expertly executed."We believe that what is expected of your systems integrator is…” Source: RevenueBase Database · checked Aug 31, 2026
14	Ainsys	Partial evidence	London, United Kingdom	11-50	9 contacts →
	Partial evidence “Welcome to AINSYS - Amazingly Integrated Systems, your trusted partner in data management and software integration.” Source: RevenueBase Database · checked Aug 31, 2026
15	Ledgerscope	Indirect evidence	London, United Kingdom	11-50	6 contacts →
	Indirect evidence “We are a small and nimble fintech company, with unique skills for extracting, understanding and transforming accounting data.” Source: RevenueBase Database · checked Aug 31, 2026
16	ACUTO	Indirect evidence	London, United Kingdom	1-10	5 contacts →
	Indirect evidence “We empower digital marketing agencies with cutting-edge data and automation solutions, helping them work smarter, not harder.” Source: RevenueBase Database · checked Aug 31, 2026
17	Fixspec	Partial evidence	London, United Kingdom	1-10	4 contacts →
	Partial evidence “Create better API connections - We help forward-thinking trading organisations to create and manage better API connections with their trading counter-parties, through a unique…” Source: RevenueBase Database · checked Aug 31, 2026
18	Connectorly	Indirect evidence	London, United Kingdom	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 Aug 31, 2026
19	Apiway	Partial evidence	London, United Kingdom	1-10	3 contacts →
	Partial evidence “Apiway is a tech startup that focuses on APIs and their entire lifecycle management.” Source: RevenueBase Database · checked Aug 31, 2026
20	Huro Data Technologies LTD	Strong evidence	London, United Kingdom	1-10	3 contacts →
	Strong evidence “HDT Integration Platform as a Service (iPaaS) provides data solutions for the B2B and B2C markets.” Source: RevenueBase Database · checked Aug 31, 2026
21	Attlaz	Strong evidence	London, United Kingdom	1-10	3 contacts →
	Strong evidence “Attlaz is a cloud-based integration and automation platform (iPaaS) designed to help B2B and B2C businesses streamline complex data flows and unify their technology ecosystems.” Source: RevenueBase Database · checked Aug 31, 2026
22	Flexiweb.co Flexible WEB Strategies LTD	Indirect evidence	London, United Kingdom	1-10	2 contacts →
	Indirect evidence “Flexiweb.co is a UK registered technology digital driven company with an international presence in India and United States.” Source: RevenueBase Database · checked Aug 31, 2026
23	OOLYS	Strong evidence	London, United Kingdom	11-50	2 contacts →
	Strong evidence “Oolys is an API infrastructure platform for Financial Service Providers.” Source: RevenueBase Database · checked Aug 31, 2026
24	Dextcloud	Partial evidence	London, United Kingdom	1-10	2 contacts →
	Partial evidence “BUILD HEADLESS API & EVENT-DRIVEN SERVICES WITH LOW CODE Build REST, EVENT, GraphQL(beta) APIs.” Source: RevenueBase Database · checked Aug 31, 2026
25	Sambrands	Indirect evidence	London, United Kingdom	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Aug 31, 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: api and integration platform 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 api and integration platform companies.
Partial evidence: Its own public description names part of api and integration platform companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name api and integration platform 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 45 api and integration platform companies based in London, United Kingdom

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Api and integration platform companies based in London, United Kingdom at a glance

As of Aug 31, 2026

38.6%Verified-email coverage

10.4%Mobile-number coverage

22.2Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · London

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 api and integration platform 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 “api and integration platform 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 api and integration platform 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 api and integration platform 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, 385 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 August 31, 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.

Api and integration platform companies by metro in the United Kingdom

Api and integration platform companies in London45

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 api and integration platform 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 api and integration platform companies are there based in London, United Kingdom?

RevenueBase identified 45 api and integration platform companies headquartered in London, United Kingdom as of August 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?

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

Which city has the most api and integration platform companies?

London leads with 45 headquartered companies, followed by Manchester (4) and Reading (2).

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 385 verified decision-maker contacts tracked across these 45 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 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.