Company lists · Data refreshed September 2026

Top 25 Messaging and communication platforms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 405 companies tracked

RevenueBase identified 405 messaging and communication platforms headquartered in the United States as of September 2026 and tracks 23,335 professional contacts across them, including 6,941 with verified work emails and 5,546 with mobile numbers. San Francisco is the largest hub.

This list covers messaging and 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 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

405Companies

23,335Contacts tracked

6,941Verified emails

5,546Mobile numbers

Unlock all 405 companies Free signup · no credit card · 500 free credits

The 25 largest messaging and communication platforms based in the United States

Ranked by team size

Top 25 of 405 messaging and communication platforms based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names messaging and communication platforms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	ZOOMPartial evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	5,001-10,000	9,706
	“Bring teams together, reimagine workspaces, engage new audiences, and delight your customers –– all on the Zoom AI-first work platform you know and love.” Source: company website · checked Sep 5, 2026
2	WhatsappIndirect evidence	Menlo Park, CA, United StatesHQ checked Sep 5, 2026	n/a	2,394
	“WhatsApp is a fast, simple and reliable way to talk to anyone in the world.” Source: company website · checked Sep 5, 2026
3	AttentiveIndirect evidence	New York, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,287
	“Attentive® knows personalized customer experiences require both powerful technology and the right people behind it.” Source: company website · checked Sep 5, 2026
4	Intermedia Intelligent CommunicationsStrong evidence	Sunnyvale, CA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,254
	“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: company website · checked Sep 5, 2026
5	AGORAIndirect evidence	Santa Clara, CA, United StatesHQ checked Sep 5, 2026	501-1,000	516
	“Agora (NASDAQ: API) is the global leader in real-time engagement, providing developers with simple, flexible, and powerful APIs to embed real-time conversational AI, voice, video…” Source: company website · checked Sep 5, 2026
6	SymphonyStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	490
	“Symphony is an AI-powered communication and technology company fueled by interconnected platforms: Messaging, Voice, Directory and Analytics.” Source: company website · checked Sep 5, 2026
7	WorkshopStrong evidence	Omaha, NE, United StatesHQ checked Sep 5, 2026	51-200	447
	“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 5, 2026
8	SKYPEIndirect evidence	Redmond, WA, United StatesHQ checked Sep 5, 2026	10001+	423
	“The next generation of Skype from Microsoft gives you better ways to chat, call, and plan fun things to do with the people in your life every day.” Source: company website · checked Sep 5, 2026
9	ZUKUPartial evidence	Madison, CT, United StatesHQ checked Sep 5, 2026	n/a	408
	“zuku is a US-based company that lets you use mobile messaging to build a private network of the people that are important to you and your organization.” Source: company website · checked Sep 5, 2026
10	Inteliquent, A Sinch CompanyIndirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	501-1,000	327
	“We've moved pages.” Source: company website · checked Sep 5, 2026
11	SendbirdIndirect evidence	San Mateo, CA, United StatesHQ checked Sep 5, 2026	201-500	297
	“Sendbird is the AI customer experience company.” Source: company website · checked Sep 5, 2026
12	UltatelPartial evidence	Herndon, VA, United StatesHQ checked Sep 5, 2026	51-200	285
	“Ultatel delivers a powerful yet easy-to-use cloud communications suite that scales with your business-combining voice, SMS, chat, video, online fax, and contact center…” Source: company website · checked Sep 5, 2026
13	FirstupStrong evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	201-500	270
	“The Firstup Intelligent Communication Platform equips organizations to improve productivity, retention, labor efficiency, safety compliance, and revenue performance by activating…” Source: company website · checked Sep 5, 2026
14	MoviusStrong evidence	Alpharetta, GA, United StatesHQ checked Sep 5, 2026	51-200	237
	“We solve a critical gap businesses face with employee to client communication, over voice and messaging.” Source: company website · checked Sep 5, 2026
15	CourierStrong evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	n/a	237
	“Courier is the customer messaging and notifications platform where your team and AI agents collaborate.” Source: company website · checked Sep 5, 2026
16	Vitel GlobalPartial evidence	South Plainfield, NJ, United StatesHQ checked Sep 5, 2026	51-200	212
	“Communication is the backbone of every business.” Source: company website · checked Sep 5, 2026
17	VoximplantPartial evidence	Palo Alto, CA, United StatesHQ checked Sep 5, 2026	201-500	194
	“Voximplant versatile cloud platform enables business to bring interaction to a different level.” Source: company website · checked Sep 5, 2026
18	LeapxpertPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	179
	“LeapXpert is the leader in Responsible Business Communication.” Source: company website · checked Sep 5, 2026
19	Vertical CommunicationsStrong evidence	Tempe, AZ, United StatesHQ checked Sep 5, 2026	201-500	175
	“Vertical Communications is a leading provider of communications platforms and applications that enable critical business workflows for enterprises across a variety of industries…” Source: company website · checked Sep 5, 2026
20	LOOMPartial evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	51-200	146
	“We're bringing video messaging to work and empowering everyone to communicate more effectively, wherever they are.” Source: company website · checked Sep 5, 2026
21	Kika Tech, INCIndirect evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	201-500	110
	“Kika's mission is to revolutionize how the world communicates and make it easier, faster, and more expressive.” Source: company website · checked Sep 5, 2026
22	Fuze An 8x8 CompanyStrong evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	501-1,000	103
	“Fuze is a global cloud communications and collaboration software platform for the enterprise that was acquired by 8x8.” Source: company website · checked Sep 5, 2026
23	CometchatIndirect evidence	Denver, CO, United StatesHQ checked Sep 5, 2026	51-200	89
	“Finishing your product shouldn’t be harder than building it.” Source: company website · checked Sep 5, 2026
24	LINQIndirect evidence	Birmingham, AL, United StatesHQ checked Sep 5, 2026	11-50	82
	“Linq is the infrastructure to build AI agents in iMessage, covering a suite of enterprise-ready APIs for iMessage, SMS, RCS and voice channels, built for engineers and product…” Source: company website · checked Sep 5, 2026
25	AmplispotStrong evidence	New York City, NY, United StatesHQ checked Sep 5, 2026	51-200	77
	“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 5, 2026

Showing 25 of 405 messaging and communication platforms based in the United States

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Messaging and communication platforms based in the United States at a glance

As of Sep 5, 2026

11-50Median size (employees)

San FranciscoLargest hub · 42 HQs

5,546Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

167

11-50

161

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

6,341

31–60

537

61–90

90–180

180+

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 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 “messaging and 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 messaging and 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, 6,941 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 5, 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 communication platforms by metro

Messaging and communication platforms in San Francisco42
Messaging and communication platforms in New York34

Frequently asked

How many messaging and communication platforms are there based in the United States?

RevenueBase identified 405 messaging and 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?

ZOOM, headquartered in San Jose, tops this list with the largest team on record.

Which city has the most messaging and communication platforms?

San Francisco leads with 42 headquartered companies, followed by New York (34) and Palo Alto (11).

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 6,941 verified decision-maker contacts tracked across these 405 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 5, 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.