Company lists · Data refreshed September 2026
Top 25 Internal communication platforms based in the United States
RevenueBase identified 224 internal communication platforms headquartered in the United States as of September 2026 and tracks 6,840 professional contacts across them, including 996 with verified work emails and 1,784 with mobile numbers. San Francisco is the largest hub.
This list covers internal communication platforms headquartered in the United States, 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, how directly it supports the match, and when it was last checked. Data refreshed September 4, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 internal communication platforms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,591 | ||||
“Slack is on a mission to make people's working lives simpler, more pleasant and more productive.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 2 | 760 | ||||
“Café helps enterprises drive collaboration, engagement, and cohesion through real-world interactions.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 487 | ||||
“At Humand, we empower companies to digitize their internal communication, culture, and HR processes in one unified platform, recognizing that the future of mid market and…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 4 | WorkshopStrong evidence | 426 | |||
“Workshop is a modern, purpose-built internal communications platform that helps teams create, send, manage, and measure employee communications in one place, starting with email…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 5 | 208 | ||||
“Communication is the backbone of every business.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | 165 | ||||
“Jive is the leading provider of modern communication and collaboration solutions for business.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 7 | 152 | ||||
“Blink is the mobile-first employee experience platform that connects your people, systems, and culture in one super-app.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | 103 | ||||
“Fuze is a global cloud communications and collaboration software platform for the enterprise that was acquired by 8x8.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | 83 | ||||
“Axios HQ is the first internal communications management platform to equip organizations with the tools, data, and best practices to be world-class communicators.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 10 | 79 | ||||
“Amplispot is the mobile-first company communications platform, used by organizations to increase productivity and empower advocacy by informing and engaging employees with timely…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | MIOPartial evidence | 74 | |||
“Mio is a secure middleware that unlocks cross-platform messaging, file sharing, and meeting initiation for enterprise organizations that use Google Workspace and Microsoft 365…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 12 | 63 | ||||
“Swit is every team's work hub that consolidates collaboration essentials in one place - task, chat, goals, approvals, and integrations.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 13 | 58 | ||||
“Gather is a virtual office where remote teams can meet, chat, and interact like they’re in person.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 14 | 55 | ||||
“The INCITE platform is a mobile-first communications, training and task management platform designed for today’s modern workforce.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 15 | 49 | ||||
“Axero provides easy-to-use intranet software that boosts productivity, unifies your people, and helps your company thrive.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 16 | 49 | ||||
“Pumble is a free team alternative to Slack and Microsoft Teams.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | 43 | ||||
“PoliteMail is an internal communications measurement platform for Microsoft Outlook and Office365.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 18 | 38 | ||||
“Haystack reinvented the intranet for the future of work, with a focus on seamless integrations, powerful search capabilities, and consumer-grade design.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 19 | SocialchorusIndirect evidence | 36 | |||
“Agility is the greatest advantage in the modern marketplace.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 20 | 35 | ||||
“HubEngage™ is a unified employee communications, engagement, recognition and instant messaging platform.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | 31 | ||||
“Most engagement doesn’t happen inside your product.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 22 | ZIGHTPartial evidence | 31 | |||
“Visual work communication tool that helps teams share information faster through instantly shareable videos, gifs, and screenshots with 4 million + users.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 23 | 30 | ||||
“Cerkl Broadcast is the premier, forward-thinking employee communications suite.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 24 | 28 | ||||
“Half your workforce has questions but doesn't know where to ask.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 25 | BubblesIndirect evidence | 24 | |||
“Teamwork.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 224 internal communication platforms based in the United States
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Internal communication platforms based in the United States at a glance
As of Sep 4, 2026Companies by employee count
Verified emails by last verification
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 internal communication platforms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “internal communication platforms”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among internal communication platforms, and records with no verified work email. Companies headquartered outside United States 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 an evidence 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, 996 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 4, 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.
Internal communication platforms by metro
- Internal communication platforms in San Francisco35
Frequently asked
How many internal communication platforms are there based in the United States?
RevenueBase identified 224 internal communication platforms headquartered in the United States 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?
SLACK, headquartered in San Francisco, tops this list with the largest team on record.
Which city has the most internal communication platforms?
San Francisco leads with 35 headquartered companies, followed by New York (19) and Atlanta (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 996 verified decision-maker contacts tracked across these 224 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 4, 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 SmartSearch, 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.
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