Company lists · Data refreshed September 2026

Top 25 Employee communication platform providers based in the United States

Name: Employee communication platform providers 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 415 companies tracked

RevenueBase identified 415 employee communication platform providers headquartered in the United States as of September 2026 and tracks 15,967 professional contacts across them, including 4,902 with verified work emails. San Francisco is the largest hub.

This list covers employee communication platform providers 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

415Companies

15,967Contacts tracked

4,902Verified emails

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The 25 largest employee communication platform providers based in the United States

Ranked by team size

Top 25 of 415 employee communication platform providers 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 employee communication platform providers: 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	SLACK	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,619 contacts →
	Indirect evidence “Slack is on a mission to make people's working lives simpler, more pleasant and more productive.” Source: RevenueBase Database · checked Sep 28, 2026
2	HIBOB	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,669 contacts →
	Partial evidence “HiBob is on a mission to transform how organizations operate in the modern world of work with its HR platform,"Bob." Leading the way for the future workplace, Bob offers…” Source: RevenueBase Database · checked Sep 28, 2026
3	Workhuman	Partial evidence	Framingham, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	997 contacts →
	Partial evidence “Founded in Workhuman has been committed to building human workplaces that recognize the value and potential of every employee.” Source: RevenueBase Database · checked Sep 28, 2026
4	Empyrean	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	501-1,000	905 contacts →
	Partial evidence “Established in 2006, Empyrean is a leading technology SaaS company empowering organizations with innovative technology and a service-first approach that accelerates employers’…” Source: RevenueBase Database · checked Sep 28, 2026
5	Café YC S21	Indirect evidence	NY, United StatesHQ checked Sep 28, 2026	n/a	827 contacts →
	Indirect evidence “Café helps enterprises drive collaboration, engagement, and cohesion through real-world interactions.” Source: RevenueBase Database · checked Sep 28, 2026
6	Simpplr	Strong evidence	Redwood City, CA, United StatesHQ checked Sep 28, 2026	201-500	512 contacts →
	Strong evidence “Simpplr is the AI-powered employee experience (EX) unification platform that brings engagement and productivity together in one intelligent, intuitive experience.” Source: RevenueBase Database · checked Sep 28, 2026
7	Appspace	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 28, 2026	201-500	460 contacts →
	Indirect evidence “Connect your people, places, and spaces.” Source: RevenueBase Database · checked Sep 28, 2026
8	Workshop	Strong evidence	Omaha, NE, United StatesHQ checked Sep 28, 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 28, 2026
9	Vantage Circle	Strong evidence	Plano, TX, United StatesHQ checked Sep 28, 2026	201-500	338 contacts →
	Strong evidence “Build a Thriving Culture with Behaviorial-Science-Powered Employee Engagement Platform to Recognize & Nurture Productive Behaviors.” Source: RevenueBase Database · checked Sep 28, 2026
10	Terryberry	Partial evidence	Grand Rapids, MI, United StatesHQ checked Sep 28, 2026	201-500	274 contacts →
	Partial evidence “Imagine your company is an 8-person rowing team and every employee is a rower.” Source: RevenueBase Database · checked Sep 28, 2026
11	Engage2excel	Partial evidence	Mooresville, NC, United StatesHQ checked Sep 28, 2026	501-1,000	272 contacts →
	Partial evidence “Engage2Excel is a leading career experience company providing recruitment, onboarding, employee recognition, manager development and employee survey solutions designed to help…” Source: RevenueBase Database · checked Sep 28, 2026
12	Firstup	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 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 28, 2026
13	Movius	Strong evidence	Alpharetta, GA, United StatesHQ checked Sep 28, 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 28, 2026
14	Nectar	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 28, 2026	51-200	225 contacts →
	Indirect evidence “Nectar gives organizations the tools to build a culture people won't want to leave.” Source: RevenueBase Database · checked Sep 28, 2026
15	Changeengine	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	n/a	182 contacts →
	Strong evidence “ChangeEngine is the AI-powered employee experience orchestration platform that redefines how People teams design, launch, and scale employee programs across the entire employee…” Source: RevenueBase Database · checked Sep 28, 2026
16	Infeedo AI	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	201-500	176 contacts →
	Partial evidence “In 2016, we set out on a mission to make 100 million employees heard and valued.” Source: RevenueBase Database · checked Sep 28, 2026
17	Thrivepass	Partial evidence	Denver, CO, United StatesHQ checked Sep 28, 2026	51-200	173 contacts →
	Partial evidence “ThrivePass is a rapidly growing technology company dedicated to innovating the world of employee benefits.” Source: RevenueBase Database · checked Sep 28, 2026
18	Korbyt	Partial evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	51-200	154 contacts →
	Partial evidence “Korbyt helps corporate enterprises and educational leaders create smart digital signage and booking experiences that engage employees, customers, and visitors effectively.” Source: RevenueBase Database · checked Sep 28, 2026
19	BLINK	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	152 contacts →
	Strong evidence “Blink is the mobile-first employee experience platform that connects your people, systems, and culture in one super-app.” Source: RevenueBase Database · checked Sep 28, 2026
20	Exponenthr	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	51-200	114 contacts →
	Indirect evidence “At ExponentHR, we’re reliable, diligent, genuine, and responsive.” Source: RevenueBase Database · checked Sep 28, 2026
21	Workday Peakon Employee Voice	Partial evidence	Pleasanton, CA, United StatesHQ checked Sep 28, 2026	10001+	111 contacts →
	Partial evidence “Workday Peakon Employee Voice empowers business leaders to deliver personalized employee experiences, during the moments that matter to build an inclusive, equitable culture for…” Source: RevenueBase Database · checked Sep 28, 2026
22	Semos Cloud	Indirect evidence	Lewisville, TX, United StatesHQ checked Sep 28, 2026	201-500	108 contacts →
	Indirect evidence “Semos Cloud is your strategic partner in connecting culture, people, and skills.” Source: RevenueBase Database · checked Sep 28, 2026
23	Fuze An 8x8 Company	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 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 28, 2026
24	HP Workforce Experience	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 28, 2026	n/a	95 contacts →
	Partial evidence “Putting IT leaders back in control and empowering employees to thrive at the intersection of work and life is what motivates us every day.” Source: RevenueBase Database · checked Sep 28, 2026
25	Bonusly	Indirect evidence	Boulder, CO, United StatesHQ checked Sep 28, 2026	51-200	93 contacts →
	Indirect evidence “Bonusly helps teams build the everyday habits that drive engagement, performance, and recognition.” 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: employee communication platform providers. 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 employee communication platform providers.
Partial evidence: Its own public description names part of employee communication platform providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name employee communication platform providers. 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 415 employee communication platform providers based in the United States

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Employee communication platform providers based in the United States at a glance

As of Sep 28, 2026

30.7%Verified-email coverage

38.5Average contacts per company

11-50Median size (employees)

10.1%Largest-city concentration · San Francisco

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

156

11-50

170

51-200

201-500

501-1,000

1,001-5,000

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 415 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 employee communication platform providers, 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 “employee communication platform providers”. 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 employee communication platform providers), 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 employee communication platform providers, 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, 4,902 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.

Employee communication platform providers 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 employee communication platform providers, 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 employee communication platform providers are there based in the United States?

RevenueBase identified 415 employee communication platform providers 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?

SLACK, headquartered in San Francisco, tops this list with the largest team on record.

Which city has the most employee communication platform providers?

San Francisco leads with 42 headquartered companies, followed by New York (30) and Boston (13).

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 4,902 verified decision-maker contacts tracked across these 415 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.