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.
The 25 largest email and collaboration platforms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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, 2026Thanks. The Data Team will review it. | |||||
| 2 | 3,428 contacts → | ||||
Indirect evidence “Dropbox is the one place to keep life organized and keep work moving.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 3 | 2,619 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,254 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, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,103 contacts → | ||||
Indirect evidence “There is a better way to work.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,082 contacts → | ||||
Indirect evidence “iManage is the company dedicated to Making Knowledge Work.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 7 | 827 contacts → | ||||
Partial evidence “Café helps enterprises drive collaboration, engagement, and cohesion through real-world interactions.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 8 | 537 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, 2026Thanks. The Data Team will review it. | |||||
| 9 | 408 contacts → | ||||
Indirect evidence “OAAI12 17“”e-cologye-officeOAeteamse-mobile Weaver was founded in 2001 and headquartered in Shanghai.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 10 | 367 contacts → | ||||
Partial evidence “Oodrive is Europe's first trusted collaborative suite.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 11 | 348 contacts → | ||||
Indirect evidence “At Cybozu, our mission is to build a society brimming with teamwork.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 12 | 334 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, 2026Thanks. The Data Team will review it. | |||||
| 13 | 326 contacts → | ||||
Indirect evidence “MyOffice offers secure office solutions for communications and teamwork.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 14 | 291 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, 2026Thanks. The Data Team will review it. | |||||
| 15 | 198 contacts → | ||||
Indirect evidence “Your all-in-one workspace for growth.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 16 | 181 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, 2026Thanks. The Data Team will review it. | |||||
| 17 | 168 contacts → | ||||
Strong evidence “InVision is the visual collaboration platform powering the world’s smartest companies.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 18 | 166 contacts → | ||||
Partial evidence “Lark is a new take on the office suite that is transforming workplace collaboration.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 19 | 164 contacts → | ||||
Partial evidence “Jive is the leading provider of modern communication and collaboration solutions for business.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 20 | 160 contacts → | ||||
Indirect evidence “37signals makes Basecamp and HEY.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 21 | 159 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, 2026Thanks. The Data Team will review it. | |||||
| 22 | 152 contacts → | ||||
Strong evidence “Mattermost is the leading collaboration platform for mission-critical work.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 23 | 148 contacts → | ||||
Partial evidence “Titan is an email suite built specifically for professionals and small businesses.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 24 | 140 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, 2026Thanks. The Data Team will review it. | |||||
| 25 | 139 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, 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: email 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 email and collaboration platforms.
- Partial evidence
- Its own public description names part of email 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 email 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 1,580 email and collaboration platforms worldwide
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 17,817 reachable decision-makers.
Free signup · no credit card
Email and collaboration platforms worldwide at a glance
As of Sep 28, 2026Companies by employee count
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 firstEvery 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
- Email and collaboration platforms based in the United States359
- Email and collaboration platforms based in India111
- Email and collaboration platforms based in the United Kingdom81
- Email and collaboration platforms based in France73
- Email and collaboration platforms based in Germany59
- Email and collaboration platforms based in Canada45
- Email and collaboration platforms based in the Netherlands39
- Email and collaboration platforms based in Brazil38
- Email and collaboration platforms based in Australia28
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.
Ready to reach these companies? Verified emails and direct dials for all 1,580 email and collaboration platforms worldwide. Start with a free account, no credit card.
Download this list →Related lists
Browse the directory
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.