Company lists · Data refreshed September 2026

Top 25 Customer communications platforms based in the United States

Name: Customer communications 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 28, 2026 641 companies tracked

RevenueBase identified 641 customer communications platforms headquartered in the United States as of September 2026 and tracks 58,067 professional contacts across them, including 21,351 with verified work emails. San Francisco is the largest hub.

This list covers customer communications 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 28, 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 28, 2026 86% judged on-target in blind review

641Companies

58,067Contacts tracked

21,351Verified emails

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The 25 largest customer communications platforms based in the United States

Ranked by team size

Top 25 of 641 customer communications platforms based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to customer communications 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	24 7.ai	Partial evidence	Campbell, CA, United StatesHQ checked Sep 28, 2026	10001+	8,461 contacts →
	Partial evidence “24]7.ai™ customer engagement solutions use conversational artificial intelligence to understand customer intent, enabling companies to create personalized, predictive, and…” Source: RevenueBase Database · checked Sep 28, 2026
2	Ringcentral	Strong evidence	Belmont, CA, United StatesHQ checked Sep 28, 2026	5,001-10,000	6,431 contacts →
	Strong evidence “RingCentral, Inc.(NYSE: RNG) is a global leader in AI–powered customer engagement, delivering an integrated platform for business phone, SMS, contact center, workforce engagement…” Source: RevenueBase Database · checked Sep 28, 2026
3	Twilio	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	5,001-10,000	6,047 contacts →
	Strong evidence “Today's leading companies trust Twilio's Customer Engagement Platform (CEP) to build direct, personalized relationships with their customers everywhere in the world.” Source: RevenueBase Database · checked Sep 28, 2026
4	Five9	Partial evidence	San Ramon, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,584 contacts →
	Partial evidence “Five9 provides a comprehensive suite of CX solutions, powered by Five9 Genius AI, to elevate customer experiences that deliver better business outcomes in the era of The New CX.” Source: RevenueBase Database · checked Sep 28, 2026
5	8x8	Indirect evidence	Campbell, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,444 contacts →
	Indirect evidence “8x8, Inc.(NASDAQ: EGHT) believes that CX limits were meant to be shattered.” Source: RevenueBase Database · checked Sep 28, 2026
6	Nextiva	Strong evidence	Scottsdale, AZ, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,638 contacts →
	Strong evidence “Build amazing customer experiences with Nextiva’s AI-powered platform.” Source: RevenueBase Database · checked Sep 28, 2026
7	Dialpad	Strong evidence	San Ramon, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,473 contacts →
	Strong evidence “Dialpad is the leading AI-powered communications intelligence platform creating human-first, AI-enhanced solutions that will drive the next wave of how businesses communicate with…” Source: RevenueBase Database · checked Sep 28, 2026
8	Talkdesk	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,316 contacts →
	Strong evidence “Talkdesk® is leading a new era in customer experience with Customer Experience Automation (CXA)-a new category and platform designed to automate the full complexity of modern…” Source: RevenueBase Database · checked Sep 28, 2026
9	Attentive	Partial evidence	New York, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,287 contacts →
	Partial evidence “Attentive® knows personalized customer experiences require both powerful technology and the right people behind it.” Source: RevenueBase Database · checked Sep 28, 2026
10	Unifycx	Strong evidence	Louisville, KY, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,270 contacts →
	Strong evidence “UnifyCX is a future-ready, next-generation customer experience platform that fuses the best of human expertise with advanced AI technology.” Source: RevenueBase Database · checked Sep 28, 2026
11	Bandwidth INC	Strong evidence	Raleigh, NC, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,128 contacts →
	Strong evidence “Bandwidth is the universal communications platform that simplifies how businesses deliver integrated global experiences.” Source: RevenueBase Database · checked Sep 28, 2026
12	Aircall	Strong evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	804 contacts →
	Strong evidence “The collaborative, AI-powered platform for customer conversations.” Source: RevenueBase Database · checked Sep 28, 2026
13	Iterable	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	771 contacts →
	Strong evidence “Iterable is the AI customer engagement platform built for enterprise scale, loved by teams, and trusted by global brands like Priceline, Fabletics, Blockchain, and Box.” Source: RevenueBase Database · checked Sep 28, 2026
14	Khoros	Partial evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	501-1,000	763 contacts →
	Partial evidence “Khoros' award-winning enterprise software makes it easier for complex brands to engage with customers at scale across digital, social, and brand-owned channels.” Source: RevenueBase Database · checked Sep 28, 2026
15	Alianza	Partial evidence	Pleasant Grove, UT, United StatesHQ checked Sep 28, 2026	501-1,000	606 contacts →
	Partial evidence “Empowering service provider growth with the world’s most trusted Intelligent Communications Fabric.” Source: RevenueBase Database · checked Sep 28, 2026
16	Call Center Studio	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	567 contacts →
	Partial evidence “Call Center Studio is an AI-powered, cloud-based contact center software that redefines how businesses engage with their customers.” Source: RevenueBase Database · checked Sep 28, 2026
17	Symphony	Strong evidence	New York, NY, United StatesHQ checked Sep 28, 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 28, 2026
18	Saas Labs	Indirect evidence	Palo Alto, CA, United StatesHQ checked Sep 28, 2026	201-500	448 contacts →
	Indirect evidence “SaaS Labs is all about helping sales and support teams reach their full potential.” Source: RevenueBase Database · checked Sep 28, 2026
19	customer.io	Strong evidence	Portland, OR, United StatesHQ checked Sep 28, 2026	201-500	446 contacts →
	Strong evidence “Create personalized customer journeys that engage and convert with our versatile customer engagement platform.” Source: RevenueBase Database · checked Sep 28, 2026
20	DOXIM	Strong evidence	Troy, MI, United StatesHQ checked Sep 28, 2026	501-1,000	436 contacts →
	Strong evidence “Doxim is the customer communications management and engagement technology leader serving highly regulated markets, including financial services, utilities and healthcare.” Source: RevenueBase Database · checked Sep 28, 2026
21	FRONT	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	430 contacts →
	Strong evidence “Front is the customer operations platform built for B2B complexity, keeping every team, tool, and customer conversation in sync so companies can scale without losing connection.” Source: RevenueBase Database · checked Sep 28, 2026
22	O'neil Digital Solutions	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 28, 2026	201-500	421 contacts →
	Strong evidence “O’Neil Digital Solutions is a customer communication management (CCM) and CX technology provider serving healthcare and financial services organizations, specializing in…” Source: RevenueBase Database · checked Sep 28, 2026
23	Kana Software	Partial evidence	Santa Clara, CA, United StatesHQ checked Sep 28, 2026	501-1,000	307 contacts →
	Partial evidence “KANA understands the value of great Customer Service experiences.” Source: RevenueBase Database · checked Sep 28, 2026
24	Outplex	Partial evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	301 contacts →
	Partial evidence “OutPLEX is a leading international digital and voice customer contact management services organization developing solutions for the world's most trusted brands.” Source: RevenueBase Database · checked Sep 28, 2026
25	Sendbird	Partial evidence	San Mateo, CA, United StatesHQ checked Sep 28, 2026	201-500	297 contacts →
	Partial evidence “Sendbird is the AI customer experience company.” Source: RevenueBase Database · checked Sep 28, 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: customer communications 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 customer communications platforms.
Partial evidence: Its own public description names part of customer communications platforms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name customer communications 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 641 customer communications platforms based in the United States

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Customer communications platforms based in the United States at a glance

As of Sep 28, 2026

36.8%Verified-email coverage

90.6Average contacts per company

11-50Median size (employees)

7.6%Largest-city concentration · San Francisco

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

193

11-50

253

51-200

122

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 641 companies.

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 customer communications 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 “customer communications 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 customer communications 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 customer communications 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, 21,351 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.

Customer communications 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 customer communications 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 customer communications platforms are there based in the United States?

RevenueBase identified 641 customer communications 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?

24 7.ai, headquartered in Campbell, tops this list with the largest team on record.

Which city has the most customer communications platforms?

San Francisco leads with 49 headquartered companies, followed by New York (45) and Miami (20).

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 21,351 verified decision-maker contacts tracked across these 641 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.

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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.