Company lists · Data refreshed September 2026

Top 25 Customer engagement hub software companies based in the United States

Name: Customer engagement hub software companies 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 420 companies tracked

RevenueBase identified 420 customer engagement hub software companies headquartered in the United States as of September 2026 and tracks 49,453 professional contacts across them, including 23,476 with verified work emails. San Francisco is the largest hub.

This list covers customer engagement hub software companies 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

420Companies

49,453Contacts tracked

23,476Verified emails

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The 25 largest customer engagement hub software companies based in the United States

Ranked by team size

Top 25 of 420 customer engagement hub software companies 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 engagement hub software companies: 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	Hubspot	Strong evidence	Cambridge, MA, United StatesHQ checked Sep 28, 2026	5,001-10,000	11,077 contacts →
	Strong evidence “HubSpot is a leading agentic customer platform that provides software and support to help businesses grow better.” Source: RevenueBase Database · checked Sep 28, 2026
2	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
3	Sprinklr	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,513 contacts →
	Partial evidence “Sprinklr is the definitive, AI-native platform for Unified Customer Experience Management (Unified-CXM), empowering brands to deliver extraordinary experiences at scale, across…” Source: RevenueBase Database · checked Sep 28, 2026
4	Klaviyo	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,789 contacts →
	Indirect evidence “Klaviyo (NYSE: KVYO) is the autonomous B2C CRM.” Source: RevenueBase Database · checked Sep 28, 2026
5	BRAZE	Strong evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,142 contacts →
	Strong evidence “Braze is the leading customer engagement platform that empowers brands to Be Absolutely Engaging.™ Braze allows any marketer to collect and take action on any amount of data from…” Source: RevenueBase Database · checked Sep 28, 2026
6	Support Services Group	Strong evidence	Waco, TX, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,710 contacts →
	Strong evidence “Support Services Group (SSG) helps businesses accelerate growth and earn customers for life through high-touch, outsourced engagement center services.” Source: RevenueBase Database · checked Sep 28, 2026
7	Nextiva	Partial evidence	Scottsdale, AZ, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,638 contacts →
	Partial evidence “Build amazing customer experiences with Nextiva’s AI-powered platform.” Source: RevenueBase Database · checked Sep 28, 2026
8	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
9	Unifycx	Partial evidence	Louisville, KY, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,270 contacts →
	Partial 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
10	Moengage	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	908 contacts →
	Strong evidence “MoEngage is an agentic customer engagement platform for the customer-obsessed marketers and product owners.” Source: RevenueBase Database · checked Sep 28, 2026
11	FCR	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	791 contacts →
	Indirect evidence “TTEC Agility - Nestled within TTEC’s 40 years of experience lies TTEC Agility.” Source: RevenueBase Database · checked Sep 28, 2026
12	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
13	Khoros	Strong evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	501-1,000	763 contacts →
	Strong 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
14	Clevertap	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	702 contacts →
	Strong evidence “CleverTap is the leading all-in-one customer engagement platform that helps brands unlock limitless customer lifetime value.” Source: RevenueBase Database · checked Sep 28, 2026
15	On24	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	622 contacts →
	Indirect evidence “ON24, a Cvent company, is on a mission to help businesses bring their go-to-market strategy into the AI era and drive cost-effective revenue growth.” Source: RevenueBase Database · checked Sep 28, 2026
16	Adobe Marketo	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	572 contacts →
	Partial evidence “Adobe Marketo Engage offers the leading Engagement Platform that empowers marketers to build brand value, grow revenue, and prove impact.” Source: RevenueBase Database · checked Sep 28, 2026
17	Acoustic	Indirect evidence	Conway, AR, United StatesHQ checked Sep 28, 2026	501-1,000	539 contacts →
	Indirect evidence “Acoustic, L.P.” Source: RevenueBase Database · checked Sep 28, 2026
18	Branch	Indirect evidence	Mountain View, CA, United StatesHQ checked Sep 28, 2026	201-500	459 contacts →
	Indirect evidence “Branch is on a mission: to power impactful experiences in the connected world.” Source: RevenueBase Database · checked Sep 28, 2026
19	Liquidhub	Indirect evidence	Wayne, PA, United StatesHQ checked Sep 28, 2026	1,001-5,000	429 contacts →
	Indirect evidence “LiquidHub is a Capgemini company.” Source: RevenueBase Database · checked Sep 28, 2026
20	Resulticks	Strong evidence	Seattle, WA, United StatesHQ checked Sep 28, 2026	201-500	375 contacts →
	Strong evidence “Resulticks is a fully integrated, real-time audience engagement solution designed to help brands worldwide reach, acquire, and retain satised customers.” Source: RevenueBase Database · checked Sep 28, 2026
21	AUGEO	Indirect evidence	Rochester, NY, United StatesHQ checked Sep 28, 2026	501-1,000	359 contacts →
	Indirect evidence “Augeo is a loyalty platform with agentic AI that reads every signal and acts in real time, before the moment passes.” Source: RevenueBase Database · checked Sep 28, 2026
22	Callrail	Strong evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	201-500	332 contacts →
	Strong evidence “CallRail is the lead engagement platform that makes it easy for businesses to attract more leads, convert more customers, and optimize their marketing.” Source: RevenueBase Database · checked Sep 28, 2026
23	CSLLC	Strong evidence	Springfield, MO, United StatesHQ checked Sep 28, 2026	1,001-5,000	327 contacts →
	Strong evidence “Communication Solutions, LLC (CSLLC) is a premier provider of Business to Business and Business to Consumer customer engagement services.” Source: RevenueBase Database · checked Sep 28, 2026
24	Growth Natives	Indirect evidence	Bellevue, WA, United StatesHQ checked Sep 28, 2026	201-500	317 contacts →
	Indirect evidence “Growth Natives is an AI-native digital transformation and growth agency.” Source: RevenueBase Database · checked Sep 28, 2026
25	Higher Logic	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	201-500	306 contacts →
	Partial evidence “Higher Logic is revolutionizing engagement for associations and businesses.” 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 engagement hub software companies. 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 engagement hub software companies.
Partial evidence: Its own public description names part of customer engagement hub software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name customer engagement hub software companies. 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 420 customer engagement hub software companies based in the United States

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Customer engagement hub software companies based in the United States at a glance

As of Sep 28, 2026

47.5%Verified-email coverage

117.7Average contacts per company

11-50Median size (employees)

8.6%Largest-city concentration · San Francisco

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

148

11-50

155

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 420 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 engagement hub software companies, 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 engagement hub software companies”. 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 engagement hub software companies), 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 engagement hub software companies, 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, 23,476 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 engagement hub software companies 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 engagement hub software companies, 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 engagement hub software companies are there based in the United States?

RevenueBase identified 420 customer engagement hub software companies 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?

Hubspot, headquartered in Cambridge, tops this list with the largest team on record.

Which city has the most customer engagement hub software companies?

San Francisco leads with 36 headquartered companies, followed by New York (26) and Austin (19).

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 23,476 verified decision-maker contacts tracked across these 420 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.