Company lists · Data refreshed September 2026

Top 25 Email and collaboration platforms worldwide

RevenueBase identified 1,580 email and collaboration platforms worldwide as of September 2026 and tracks 50,550 professional contacts across them, including 17,817 with verified work emails. The United States is the largest market and San Francisco the largest hub.

This list covers email and collaboration platforms worldwide, 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. Country and city lists for email and collaboration platforms follow the table.

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
1,580Companies
50,550Contacts tracked
17,817Verified emails
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The 25 largest email and collaboration platforms worldwide

Ranked by team size
Top 25 of 1,580 email and collaboration platforms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to email 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceSydney, TürkiyeHQ checked Sep 28, 202610001+18,878 contacts →

Partial evidence

“Atlassian powers the collaboration that helps teams accomplish what would otherwise be impossible alone.”

Source: RevenueBase Database · checked Sep 28, 2026
2Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 28, 20261,001-5,0003,428 contacts →

Indirect evidence

“Dropbox is the one place to keep life organized and keep work moving.”

Source: RevenueBase Database · checked Sep 28, 2026
3Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 28, 20261,001-5,0002,619 contacts →

Indirect evidence

“Slack is on a mission to make people's working lives simpler, more pleasant and more productive.”

Source: RevenueBase Database · checked Sep 28, 2026
4Partial evidenceSunnyvale, CA, United StatesHQ checked Sep 28, 20261,001-5,0001,254 contacts →

Partial evidence

“Intermedia is the cloud communications company that helps over businesses connect better, from wherever, through our AI-powered platform that includes voice, video conferencing…”

Source: RevenueBase Database · checked Sep 28, 2026
5Indirect evidenceRaleigh, NC, United StatesHQ checked Sep 28, 20261,001-5,0001,103 contacts →

Indirect evidence

“There is a better way to work.”

Source: RevenueBase Database · checked Sep 28, 2026
6Indirect evidenceChicago, IL, United StatesHQ checked Sep 28, 20261,001-5,0001,082 contacts →

Indirect evidence

“iManage is the company dedicated to Making Knowledge Work.”

Source: RevenueBase Database · checked Sep 28, 2026
7Partial evidenceNY, United StatesHQ checked Sep 28, 2026n/a827 contacts →

Partial evidence

“Café helps enterprises drive collaboration, engagement, and cohesion through real-world interactions.”

Source: RevenueBase Database · checked Sep 28, 2026
8Strong evidenceKarlsruhe, GermanyHQ checked Sep 28, 2026501-1,000537 contacts →

Strong evidence

“With our strong brands GMX, WEB.DE and mail.com and over 43 million active users, we are the leading email and communications platform in Germany, Austria and Switzerland.”

Source: RevenueBase Database · checked Sep 28, 2026
9Indirect evidence闵行区, ChinaHQ checked Sep 28, 20261,001-5,000408 contacts →

Indirect evidence

“OAAI12 17“”e-cologye-officeOAeteamse-mobile Weaver was founded in 2001 and headquartered in Shanghai.”

Source: RevenueBase Database · checked Sep 28, 2026
10Partial evidenceParis, FranceHQ checked Sep 28, 2026201-500367 contacts →

Partial evidence

“Oodrive is Europe's first trusted collaborative suite.”

Source: RevenueBase Database · checked Sep 28, 2026
11Indirect evidence東京都中央区, JapanHQ checked Sep 28, 2026501-1,000348 contacts →

Indirect evidence

“At Cybozu, our mission is to build a society brimming with teamwork.”

Source: RevenueBase Database · checked Sep 28, 2026
12Indirect evidenceAlkmaar, NetherlandsHQ checked Sep 28, 2026201-500334 contacts →

Indirect evidence

“Hallo is het begin van elk goed gesprek Bij Hallo beseffen we als geen ander dat goed contact met je klanten, partners, leveranciers en medewerkers het allerbelangrijkste is dat…”

Source: RevenueBase Database · checked Sep 28, 2026
13Indirect evidenceMoscow, RussiaHQ checked Sep 28, 2026501-1,000326 contacts →

Indirect evidence

“MyOffice offers secure office solutions for communications and teamwork.”

Source: RevenueBase Database · checked Sep 28, 2026
14Strong evidenceOslo, NorwayHQ checked Sep 28, 2026201-500291 contacts →

Strong evidence

“In a world where secure, cross-platform collaboration is critical, we empower organizations to communicate confidently - across borders, ecosystems, and the highest security…”

Source: RevenueBase Database · checked Sep 28, 2026
15Indirect evidenceAlexandria, VA, United StatesHQ checked Sep 28, 2026501-1,000198 contacts →

Indirect evidence

“Your all-in-one workspace for growth.”

Source: RevenueBase Database · checked Sep 28, 2026
16Indirect evidenceBuffalo, NY, United StatesHQ checked Sep 28, 2026201-500181 contacts →

Indirect evidence

“Synacor is a cloud-based software and services company headquartered in Buffalo, New York with offices across the globe.”

Source: RevenueBase Database · checked Sep 28, 2026
17Strong evidenceNew York, NY, United StatesHQ checked Sep 28, 2026501-1,000168 contacts →

Strong evidence

“InVision is the visual collaboration platform powering the world’s smartest companies.”

Source: RevenueBase Database · checked Sep 28, 2026
18Partial evidenceSingaporeHQ checked Sep 28, 20261,001-5,000166 contacts →

Partial evidence

“Lark is a new take on the office suite that is transforming workplace collaboration.”

Source: RevenueBase Database · checked Sep 28, 2026
19Partial evidenceAustin, TX, United StatesHQ checked Sep 28, 2026501-1,000164 contacts →

Partial evidence

“Jive is the leading provider of modern communication and collaboration solutions for business.”

Source: RevenueBase Database · checked Sep 28, 2026
20Indirect evidenceUnited StatesHQ checked Sep 28, 202651-200160 contacts →

Indirect evidence

“37signals makes Basecamp and HEY.”

Source: RevenueBase Database · checked Sep 28, 2026
21Strong evidenceBerlin, GermanyHQ checked Sep 28, 202651-200159 contacts →

Strong evidence

“Wire is a secure messenger and collaboration platform built for organizations that cannot afford leaks, exposure, or loss of control.”

Source: RevenueBase Database · checked Sep 28, 2026
22Strong evidencePalo Alto, CA, United StatesHQ checked Sep 28, 202651-200152 contacts →

Strong evidence

“Mattermost is the leading collaboration platform for mission-critical work.”

Source: RevenueBase Database · checked Sep 28, 2026
23Partial evidenceMumbai, IndiaHQ checked Sep 28, 202651-200148 contacts →

Partial evidence

“Titan is an email suite built specifically for professionals and small businesses.”

Source: RevenueBase Database · checked Sep 28, 2026
24Partial evidenceZurich, SwitzerlandHQ checked Sep 28, 202651-200140 contacts →

Partial evidence

“Tresorit provides an end-to-end encrypted productivity solution for ultra-secure collaboration including managing, storing, syncing, and transferring files.”

Source: RevenueBase Database · checked Sep 28, 2026
25Partial evidenceUnited StatesHQ checked Sep 28, 20261,001-5,000139 contacts →

Partial evidence

“MAXHUB is a global provider of integrated collaboration solutions, designed to make communication and teamwork more efficient across modern workplaces.”

Source: RevenueBase Database · checked Sep 28, 2026

Showing 25 of 1,580 email and collaboration platforms worldwide

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Email and collaboration platforms worldwide at a glance

As of Sep 28, 2026
35.2%Verified-email coverage
32.0Average contacts per company
11-50Median size (employees)
2.9%Largest-city concentration · San Francisco
Sep 28, 2026Page data refreshed

Companies by employee count

1-10
783
11-50
557
51-200
147
201-500
44
501-1,000
17
1,001-5,000
20
5,001-10,000
2
10001+
5

Email recency is reported on each country list linked below.

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 email 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.
Coverage
Every country. Country and city lists for email and collaboration platforms are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “email 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 email 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 email and collaboration platforms, and records with no verified work email.
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, 17,817 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.

Email and collaboration platforms by location

11 lists · largest first

Every Email and collaboration platforms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 email 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 email and collaboration platforms are there worldwide?

RevenueBase identified 1,580 email and collaboration platforms worldwide 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?

Atlassian, headquartered in Sydney, tops this list with the largest team on record.

Which country has the most email and collaboration platforms?

The United States leads with 359 companies, followed by India (111) and the United Kingdom (81). Every email and collaboration platforms list by country and city is linked on this page.

Which city has the most email and collaboration platforms?

San Francisco leads with 46 headquartered companies, followed by London (43) and Paris (24).

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 17,817 verified decision-maker contacts tracked across these 1,580 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.