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, its RevenueBase Smart Search rating, 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 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 5, 2026 86% judged on-target in blind review

405Companies

23,335Contacts tracked

6,941Verified emails

5,546Mobile numbers

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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. RevenueBase Smart Search rates how each company's information relates to messaging and communication 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	ZOOM	Partial evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	5,001-10,000	9,706 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 5, 2026
2	Whatsapp	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 5, 2026	n/a	2,394 contacts →
	Indirect evidence “WhatsApp is a fast, simple and reliable way to talk to anyone in the world.” Source: RevenueBase Database · checked Sep 5, 2026
3	Attentive	Indirect evidence	New York, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,287 contacts →
	Indirect evidence “Attentive® knows personalized customer experiences require both powerful technology and the right people behind it.” Source: RevenueBase Database · checked Sep 5, 2026
4	Intermedia Intelligent Communications	Strong evidence	Sunnyvale, CA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,254 contacts →
	Strong 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 5, 2026
5	AGORA	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 5, 2026	501-1,000	516 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
6	Symphony	Strong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	490 contacts →
	Strong evidence “Symphony is an AI-powered communication and technology company fueled by interconnected platforms: Messaging, Voice, Directory and Analytics.” Source: RevenueBase Database · checked Sep 5, 2026
7	Workshop	Strong evidence	Omaha, NE, United StatesHQ checked Sep 5, 2026	51-200	447 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 5, 2026
8	SKYPE	Indirect evidence	Redmond, WA, United StatesHQ checked Sep 5, 2026	10001+	423 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
9	ZUKU	Partial evidence	Madison, CT, United StatesHQ checked Sep 5, 2026	n/a	408 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 5, 2026
10	Inteliquent, A Sinch Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	501-1,000	327 contacts →
	Indirect evidence “We've moved pages.” Source: RevenueBase Database · checked Sep 5, 2026
11	Sendbird	Indirect evidence	San Mateo, CA, United StatesHQ checked Sep 5, 2026	201-500	297 contacts →
	Indirect evidence “Sendbird is the AI customer experience company.” Source: RevenueBase Database · checked Sep 5, 2026
12	Ultatel	Partial evidence	Herndon, VA, United StatesHQ checked Sep 5, 2026	51-200	285 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 5, 2026
13	Firstup	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	201-500	270 contacts →
	Strong evidence “The Firstup Intelligent Communication Platform equips organizations to improve productivity, retention, labor efficiency, safety compliance, and revenue performance by activating…” Source: RevenueBase Database · checked Sep 5, 2026
14	Movius	Strong evidence	Alpharetta, GA, United StatesHQ checked Sep 5, 2026	51-200	237 contacts →
	Strong evidence “We solve a critical gap businesses face with employee to client communication, over voice and messaging.” Source: RevenueBase Database · checked Sep 5, 2026
15	Courier	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	n/a	237 contacts →
	Strong evidence “Courier is the customer messaging and notifications platform where your team and AI agents collaborate.” Source: RevenueBase Database · checked Sep 5, 2026
16	Vitel Global	Partial evidence	South Plainfield, NJ, United StatesHQ checked Sep 5, 2026	51-200	212 contacts →
	Partial evidence “Communication is the backbone of every business.” Source: RevenueBase Database · checked Sep 5, 2026
17	Voximplant	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 5, 2026	201-500	194 contacts →
	Partial evidence “Voximplant versatile cloud platform enables business to bring interaction to a different level.” Source: RevenueBase Database · checked Sep 5, 2026
18	Leapxpert	Partial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	179 contacts →
	Partial evidence “LeapXpert is the leader in Responsible Business Communication.” Source: RevenueBase Database · checked Sep 5, 2026
19	Vertical Communications	Strong evidence	Tempe, AZ, United StatesHQ checked Sep 5, 2026	201-500	175 contacts →
	Strong evidence “Vertical Communications is a leading provider of communications platforms and applications that enable critical business workflows for enterprises across a variety of industries…” Source: RevenueBase Database · checked Sep 5, 2026
20	LOOM	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	51-200	146 contacts →
	Partial evidence “We're bringing video messaging to work and empowering everyone to communicate more effectively, wherever they are.” Source: RevenueBase Database · checked Sep 5, 2026
21	Kika Tech, INC	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	201-500	110 contacts →
	Indirect evidence “Kika's mission is to revolutionize how the world communicates and make it easier, faster, and more expressive.” Source: RevenueBase Database · checked Sep 5, 2026
22	Fuze An 8x8 Company	Strong evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	501-1,000	103 contacts →
	Strong evidence “Fuze is a global cloud communications and collaboration software platform for the enterprise that was acquired by 8x8.” Source: RevenueBase Database · checked Sep 5, 2026
23	Cometchat	Indirect evidence	Denver, CO, United StatesHQ checked Sep 5, 2026	51-200	89 contacts →
	Indirect evidence “Finishing your product shouldn’t be harder than building it.” Source: RevenueBase Database · checked Sep 5, 2026
24	LINQ	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 5, 2026	11-50	82 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
25	Amplispot	Strong evidence	New York City, NY, United StatesHQ checked Sep 5, 2026	51-200	77 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 5, 2026

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: messaging and communication 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 messaging and communication platforms.
Partial evidence: Its own public description names part of messaging and communication platforms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name messaging and communication 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 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

29.7%Verified-email coverage

23.8%Mobile-number coverage

57.6Average contacts per company

11-50Median size (employees)

10.4%Largest-city concentration · San Francisco

Sep 5, 2026Page data 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+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

6,3410–30

53731–60

561–90

690–180

52180+

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 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.
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.
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 messaging and communication 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 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 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, 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

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 messaging and communication 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 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 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.