Company lists · Data refreshed September 2026

Top 25 Messaging and collaboration platforms based in the United Kingdom

Name: Messaging and collaboration platforms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 95 companies tracked

RevenueBase identified 95 messaging and collaboration platforms headquartered in the United Kingdom as of September 2026 and tracks 982 professional contacts across them, including 307 with verified work emails. London is the largest hub.

This list covers messaging and collaboration platforms 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 28, 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 28, 2026 86% judged on-target in blind review

95Companies

982Contacts tracked

307Verified emails

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The 25 largest messaging and collaboration platforms based in the United Kingdom

Ranked by team size

Top 25 of 95 messaging and collaboration platforms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to messaging and collaboration platforms: 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	SEDNA	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	132 contacts →
	Indirect evidence “Sedna is a transformative force in global trade, designed for industries like maritime, where stakes are high and every decision matters.” Source: RevenueBase Database · checked Sep 28, 2026
2	Element	Partial evidence	Chiswick, United KingdomHQ checked Sep 28, 2026	51-200	86 contacts →
	Partial evidence “Element is a new type of communications platform.” Source: RevenueBase Database · checked Sep 28, 2026
3	Hornbill	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	85 contacts →
	Partial evidence “Hornbill is an innovator of cloud-based business collaboration technology and applications that engage teams, optimise operations and deliver better customer experiences.” Source: RevenueBase Database · checked Sep 28, 2026
4	VIJU	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	70 contacts →
	Indirect evidence “On the 6th of February 2018, Viju and VisionsConnected officially terminated their previous company names, and created a new brand, Kinly We provide secure and flexible visual…” Source: RevenueBase Database · checked Sep 28, 2026
5	Displaynote Technologies LTD	Indirect evidence	Belfast & Murcia, United KingdomHQ checked Sep 28, 2026	11-50	40 contacts →
	Indirect evidence “DisplayNote is the Experience OS for shared meeting rooms and learning spaces.” Source: RevenueBase Database · checked Sep 28, 2026
6	Ideagen Huddle	Indirect evidence	Nottingham, United KingdomHQ checked Sep 28, 2026	1,001-5,000	37 contacts →
	Indirect evidence “Ideagen Huddle transforms the way teams work by enabling them to store, share and work on content in an efficient, simple and secure way.” Source: RevenueBase Database · checked Sep 28, 2026
7	Kolekti	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	26 contacts →
	Indirect evidence “We've got an app to help you work better – together and apart.” Source: RevenueBase Database · checked Sep 28, 2026
8	Umnico	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	18 contacts →
	Partial evidence “One window aggregator for business communication via social networks and messengers with client relationship platform combined.” Source: RevenueBase Database · checked Sep 28, 2026
9	Meetingzone	Indirect evidence	Thame, United KingdomHQ checked Sep 28, 2026	51-200	18 contacts →
	Indirect evidence “MeetingZone was set up in 2002 and has operations in the UK, Germany, USA, Nordics and Asia Pacific.” Source: RevenueBase Database · checked Sep 28, 2026
10	Bridgehampton	Indirect evidence	Strand, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Indirect evidence “The modern workplace is changing – but people will always be at its core.” Source: RevenueBase Database · checked Sep 28, 2026
11	YEO Messaging	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	16 contacts →
	Indirect evidence “YEO (pronounced ‘Yo’, and an acronym for Your Eye Only) was founded by a team of technology, security and design specialists.” Source: RevenueBase Database · checked Sep 28, 2026
12	Kahootz	Indirect evidence	Weston, United KingdomHQ checked Sep 28, 2026	11-50	15 contacts →
	Indirect evidence “Kahootz can bring everyone together in secure online workspaces, which can be configured for your specific business purpose.” Source: RevenueBase Database · checked Sep 28, 2026
13	HEED	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	15 contacts →
	Indirect evidence “Heed is a leading provider of innovative communication solutions for the modern workplace.” Source: RevenueBase Database · checked Sep 28, 2026
14	Arkchat	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	14 contacts →
	Partial evidence “Arkchat: The Messaging App That Automatically Manages Projects Most teams are stuck in a "productivity gap".” Source: RevenueBase Database · checked Sep 28, 2026
15	Superthread	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Partial evidence “Superthread is a blazing-fast project management platform built for teams that actually want to get work done.” Source: RevenueBase Database · checked Sep 28, 2026
16	Qwil Messenger	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “Provide your clients with exceptional communication experience from prospect to long term client.” Source: RevenueBase Database · checked Sep 28, 2026
17	Starleaf	Strong evidence	Watford, United KingdomHQ checked Sep 28, 2026	201-500	9 contacts →
	Strong evidence “StarLeaf enables seamless collaboration through intelligently engineered, reliable meeting room systems, superior video conferencing, and secure messaging.” Source: RevenueBase Database · checked Sep 28, 2026
18	Sipsynergy	Partial evidence	Fareham, United KingdomHQ checked Sep 28, 2026	11-50	7 contacts →
	Partial evidence “sipsynergy is the new standard in reliable, high quality hosted communications and collaboration.” Source: RevenueBase Database · checked Sep 28, 2026
19	APALO	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Strong evidence “THE MOBILE FIRST COMMUNICATION PLATFORM WITH FMC & WebRTC Apalo takes smarter communications to the next level, combining a comprehensive set of collaboration tools and rich…” Source: RevenueBase Database · checked Sep 28, 2026
20	Cosmos Video	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	6 contacts →
	Indirect evidence “Cosmos is a virtual office for remote teams who want real connection, not more meetings.” Source: RevenueBase Database · checked Sep 28, 2026
21	Voice Simplified	Indirect evidence	Westbury, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Indirect evidence “At Voice Simplified we believe that all businesses, large and small, should be able to communicate without the need for prohibitive and expensive licensing or infrastructure.” Source: RevenueBase Database · checked Sep 28, 2026
22	Tappter	Strong evidence	Milton Keynes, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Strong evidence “Tappter is a super simple messaging platform that guarantees convenient and compliant communication is only a 'tap' away.” Source: RevenueBase Database · checked Sep 28, 2026
23	Designed To Talk	Indirect evidence	Datchet, United KingdomHQ checked Sep 28, 2026	51-200	5 contacts →
	Indirect evidence “Designed to Talk (DTT) has re-designed the way business technology is delivered managed and used.” Source: RevenueBase Database · checked Sep 28, 2026
24	Imail Comms	Indirect evidence	Coventry, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Indirect evidence “Our Communications Tools provide your business with a range of cloud, API and desktop-based services that will improve your communication channel strategies.” Source: RevenueBase Database · checked Sep 28, 2026
25	Edworking	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	4 contacts →
	Partial evidence “One platform for your Team and your Work.” Source: RevenueBase Database · checked Sep 28, 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: messaging and collaboration platforms. 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 messaging and collaboration platforms.
Partial evidence: Its own public description names part of messaging and collaboration platforms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name messaging and collaboration platforms. 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 95 messaging and collaboration platforms based in the United Kingdom

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Messaging and collaboration platforms based in the United Kingdom at a glance

As of Sep 28, 2026

31.3%Verified-email coverage

10.3Average contacts per company

11-50Median size (employees)

61.1%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 95 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 messaging and collaboration platforms, 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 “messaging and collaboration platforms”. 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 messaging and collaboration platforms), 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 messaging and collaboration platforms, 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, 307 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 28, 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.

Messaging and collaboration platforms by metro

Messaging and collaboration platforms in London58

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 messaging and collaboration platforms, 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 messaging and collaboration platforms are there based in the United Kingdom?

RevenueBase identified 95 messaging and collaboration platforms 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?

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

Which city has the most messaging and collaboration platforms?

London leads with 58 headquartered companies, followed by Brighton (3) and Newcastle Upon Tyne (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 307 verified decision-maker contacts tracked across these 95 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 28, 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.