Company lists · Data refreshed September 2026

Top 23 Internal communication platforms based in San Francisco, United States

RevenueBase identified 36 company matches for internal communication platforms associated with San Francisco, United States as of September 2026 and tracks 3,213 professional contacts across them, including 108 with verified work emails and 1,260 with mobile numbers. Across the United States, San Francisco is the largest hub for this category.

This list covers company matches for internal communication platforms associated with San Francisco, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 12, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 12, 2026 How this list was built
36Companies
3,213Contacts tracked
108Verified emails
1,260Mobile numbers
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The 23 largest internal communication platforms based in San Francisco, United States

Ranked by team size
Top 23 of 36 company matches for internal communication platforms based in San Francisco, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 12, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 20261,001-5,0002,619 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
2Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202651-200146 contacts →

Exact match

“We're bringing video messaging to work and empowering everyone to communicate more effectively, wherever they are.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
3Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202651-20062 contacts →

Exact match

“Swit is every team's work hub that consolidates collaboration essentials in one place - task, chat, goals, approvals, and integrations.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
4Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202651-20036 contacts →

Exact match

“Agility is the greatest advantage in the modern marketplace.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
5Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202611-5032 contacts →

Exact match

“Most engagement doesn’t happen inside your product.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
6Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 20261-1025 contacts →

Exact match

“Teamwork.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
7Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 20261-1023 contacts →

Exact match

“We believe it should be easy to share the right information with the right people, both inside and outside of your team.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
8Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202611-5019 contacts →

Exact match

“Voxer is a high-performance messaging app that combines the power of live voice with text, photos and videos.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
9Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202611-5017 contacts →

Exact match

“Threads is an all-in-one communication platform designed for makers.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
10Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 20261-1014 contacts →

Exact match

“Zelo redefines how companies communicate internally.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
11Exact matchSan Francisco, United StatesHQ recorded Sep 12, 20261-1013 contacts →

Exact match

“Orchestra is a chat-centric workspace with built-in work tools.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
12Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202611-5010 contacts →

Exact match

“We.Team makes team communication simpler, more structured and more productive.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
13Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 20261-109 contacts →

Exact match

“Professional Services are in the business of people and processes.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
14Exact matchSan Francisco, United StatesHQ recorded Sep 12, 202651-2008 contacts →

Exact match

“One virtual platform, endless possibilities Multiple locations and remote work can challenge maintaining office culture and training teams.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
15Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202611-508 contacts →

Exact match

“Range is a team communication tool for check-ins and meeting management.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
16Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202611-504 contacts →

Exact match

“Biba is a business communication app that helps you collaborate in real-time with conference calling, screen sharing, video conferencing, and chat.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
17Exact matchSan Francisco, United StatesHQ recorded Sep 12, 20261-103 contacts →

Exact match

“Creating the next generation of communication tools for distributed work so no-one can say "People work better at the office".”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
18Exact matchSan Francisco, United StatesHQ recorded Sep 12, 20261-103 contacts →

Exact match

“emdash is a unique approach to distributed teamwork.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
19Exact matchSan Francisco, United StatesHQ recorded Sep 12, 202611-503 contacts →

Exact match

“Have something to share with your audience?”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
20Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 202611-502 contacts →

Exact match

“Werk is a collaboration tool designed for remote and hybrid teams.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
21Exact matchSan Francisco, United StatesHQ recorded Sep 12, 20261-102 contacts →

Exact match

“Patchwork supercharges your team’s communication, we replace your Slack with AI-assisted post creation, a ranked feed of the information you need, and chat for urgent needs.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
22Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 20261-101 contacts →

Exact match

“Grove’s platform empowers companies to foster stronger employee connections by bringing people together.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase
23Exact matchSan Francisco, CA, United StatesHQ recorded Sep 12, 20261-101 contacts →

Exact match

“EYEnstein™ is a communication platform used for collaboration with experts, Interactions with your team and/or a communication tool for your customers to instantly connect.”

Recorded in the RevenueBase company graph · Sep 12, 2026 · View company records in RevenueBase

Showing 23 of 36 internal communication platforms based in San Francisco, United States

See the full list, filter by size, metro and specialty, and access 108 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Internal communication platforms based in San Francisco, United States at a glance

As of Sep 12, 2026
3.4%Verified-email coverage
39.2%Mobile-number coverage
89.2Average contacts per company
11-50Median size (employees)
Sep 12, 2026Page data refreshed

Companies by employee count

1-10
14
11-50
14
51-200
4
201-500
2
1,001-5,000
1
10001+
1

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 14.5d

Company record updated

Median 52.0d

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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
Company records associated with San Francisco, United States whose business descriptions match “internal communication platforms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 108 professional contacts with verified work emails across the full matched dataset. 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 12, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “internal communication platforms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many internal communication platforms are there based in San Francisco, United States?

RevenueBase identified 36 company matches for internal communication platforms associated with San Francisco, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

SLACK tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most internal communication platforms?

San Francisco leads the United States with 35 company records, followed by New York (23) and Atlanta (7).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 108 professional contacts with verified work emails tracked across these 36 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 12, 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.