Company lists · Data refreshed September 2026
Top 25 CRM api developers based in the United Kingdom
RevenueBase identified 378 CRM api developers headquartered in the United Kingdom as of September 2026 and tracks 88,130 professional contacts across them, including 59,004 with verified work emails and 28,131 with mobile numbers. London is the largest hub.
This list covers CRM api 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 1, 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.
The 25 largest CRM api developers based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 85,557 contacts → | ||||
Partial evidence “We're the #1 AI CRM-where humans with agents drive customer success together with AI, data, and Customer 360 apps on one platform.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 2 | 194 contacts → | ||||
Indirect evidence “Cynoteck is a Microsoft Solution Partner and Salesforce Consulting Partner Company.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 3 | 111 contacts → | ||||
Indirect evidence “CloudCentric is a Salesforce Summit Partner helping businesses transform digitally through smart, scalable, and human-centric solutions.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 4 | 83 contacts → | ||||
Partial evidence “We're an award-winning CRM agency who specialise in knitting together complex and disparate data to create a powerful single customer view that can deliver significant returns to…” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 5 | 74 contacts → | ||||
Partial evidence “Part of Cooper Parry, Cloud Orca are a award winning London based Salesforce CRM consultancy focused on delivering effective, profitable and successful implementations and support…” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 6 | 72 contacts → | ||||
Indirect evidence “MagicFuse is your trusted partner for Salesforce excellence.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 7 | 63 contacts → | ||||
Partial evidence “Workbooks is a CRM SaaS platform used by growing companies to run their business and engage effectively with their customers.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 8 | 56 contacts → | ||||
Partial evidence “Capsule was launched in 2009 following the founders' frustration with existing CRM services that were either overly simplistic or far too complex for most businesses.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 9 | 56 contacts → | ||||
Partial evidence “Optimiser CRM is an all-in-one robust platform which lets you manage and make intelligent decisions about your business for growth.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 10 | 48 contacts → | ||||
Partial evidence “We are Armadillo - A Bond Company, a multi-award winning CRM agency.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 11 | 34 contacts → | ||||
Partial evidence “As a Salesforce registered partner, we specialise in implementing and supporting Salesforce CRM and B2B Marketing Automation services.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 12 | 34 contacts → | ||||
Indirect evidence “Tengo provides world-class consulting, development & support services with expertise in Salesforce technology.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 13 | 32 contacts → | ||||
Indirect evidence “WORO is a dynamic software development company dedicated to delivering cutting-edge solutions tailored to meet the diverse needs of modern businesses as well as Generational…” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 14 | 29 contacts → | ||||
Indirect evidence “Performa | Summit Salesforce Partner & Agentforce Specialists Performa is a Summit-level Salesforce consultancy and Agentforce specialist, helping businesses of all sizes unlock…” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 15 | 18 contacts → | ||||
Indirect evidence “A leading Salesforce consultancy and Independent Software Vendor (ISV) based in the United Kingdom.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 16 | 18 contacts → | ||||
Indirect evidence “We are in business to help businesses and charities accelerate their digital transformation.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 17 | 18 contacts → | ||||
Indirect evidence “Zumzum helps you transform your Lead-2-Cash process and the way your people work to become a real time business.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 18 | 15 contacts → | ||||
Indirect evidence “Welcome to Skyla Software Solutions P Ltd, your gateway to future-forward ERP transformations and distinguished software development services!” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 19 | 13 contacts → | ||||
Strong evidence “We are an international team of CRM specialists with over 20 years experience and have developed outstanding expertise in delivering Client Relationship Management (CRM) solutions…” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 20 | 12 contacts → | ||||
Indirect evidence “Simplifying and optimizing your work since 2017.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 21 | 11 contacts → | ||||
Indirect evidence “At Signals, we help complex sales organizations be more productive.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 22 | 11 contacts → | ||||
Indirect evidence “BrightOffice are a software and services company.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 23 | 9 contacts → | ||||
Indirect evidence “At Apptituda, we help businesses get the most out of Salesforce with solutions that simplify operations and deliver measurable results.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 24 | 9 contacts → | ||||
Indirect evidence “BuddyCRM is a sales management tool built by sales professionals, for sales professionals.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
| 25 | 7 contacts → | ||||
Indirect evidence “Solution Specialists for Microsoft Technologies.” Source: RevenueBase Database · checked Sep 1, 2026Thanks. The Data Team will review it. | |||||
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: CRM api 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 CRM api developers.
- Partial evidence
- Its own public description names part of CRM api developers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name CRM api 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 378 CRM api developers based in the United Kingdom
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CRM api developers based in the United Kingdom at a glance
As of Sep 1, 2026Companies by employee count
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 CRM api 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 “CRM api 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 CRM api 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 CRM api 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, 59,004 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 1, 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.
CRM api developers by metro
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 CRM api 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 CRM api developers are there based in the United Kingdom?
RevenueBase identified 378 CRM api 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?
Salesforce, headquartered in London, tops this list with the largest team on record.
Which city has the most CRM api developers?
London leads with 127 headquartered companies, followed by Manchester (11) and Leeds (7).
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 59,004 verified decision-maker contacts tracked across these 378 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 1, 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.