Company lists · Data refreshed September 2026

Top 25 Sales engagement platform developers based in the United States

Name: Sales engagement platform developers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 1,479 companies tracked

RevenueBase identified 1,479 company matches for sales engagement platform developers associated with the United States as of September 2026 and tracks 38,671 professional contacts across them, including 12,884 with verified work emails and 10,041 with mobile numbers. San Francisco is the largest hub.

This list covers company matches for sales engagement platform developers associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 6, 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 RevenueBase SmartSearch · Exact Recorded Sep 6, 2026 How this list was built

1,479Companies

38,671Contacts tracked

12,884Verified emails

10,041Mobile numbers

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The 25 largest sales engagement platform developers based in the United States

Ranked by team size

Top 25 of 1,479 company matches for sales engagement platform developers based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Klaviyo	Exact match	Boston, MA, United StatesHQ recorded Sep 6, 2026	1,001-5,000	2,789 contacts →
	Exact match “Klaviyo (NYSE: KVYO) is the autonomous B2C CRM.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
2	Marketstar	Exact match	Ogden, UT, United StatesHQ recorded Sep 6, 2026	1,001-5,000	2,446 contacts →
	Exact match “MarketStar is a global B2B sales outsourcing leader with 38+ years of experience driving predictable revenue growth.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
3	6sense	Exact match	San Francisco, CA, United StatesHQ recorded Sep 6, 2026	1,001-5,000	1,443 contacts →
	Exact match “6sense is on a mission to revolutionize the way B2B organizations create revenue by predicting customers most likely to buy and recommending the best course of action to engage…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
4	Outreach	Exact match	Seattle, WA, United StatesHQ recorded Sep 6, 2026	501-1,000	1,281 contacts →
	Exact match “Outreach, founded in 2014, is the only complete agentic AI platform for revenue teams.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
5	Seismic	Exact match	San Diego, CA, United StatesHQ recorded Sep 6, 2026	1,001-5,000	1,256 contacts →
	Exact match “Seismic is the global leader in enablement, helping organizations engage customers, enable teams, and ignite revenue growth.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
6	Cience	Exact match	Miami, FL, United StatesHQ recorded Sep 6, 2026	201-500	1,068 contacts →
	Exact match “CIENCE Technologies, Inc, founded in 2015 and headquartered in Denver, CO, is a pioneering global company in lead generation software and services, committed to transforming the…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
7	Pipedrive	Exact match	New York, NY, United StatesHQ recorded Sep 6, 2026	501-1,000	970 contacts →
	Exact match “Founded in 2010, Pipedrive is an easy and effective sales CRM that drives small business growth.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
8	apollo.io	Exact match	San Francisco, CA, United StatesHQ recorded Sep 6, 2026	501-1,000	863 contacts →
	Exact match “Apollo.io is the AI-powered end-to-end go-to-market platform that empowers sales, marketing, and revenue teams to find prospects, engage customers, and close deals with…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
9	Memoryblue	Exact match	Tysons, VA, United StatesHQ recorded Sep 6, 2026	501-1,000	825 contacts →
	Exact match “memoryBlue is the go-to partner for revenue leaders in B2B Tech looking to grow their pipeline engine.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
10	On24	Exact match	San Francisco, CA, United StatesHQ recorded Sep 6, 2026	501-1,000	622 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
11	Sugarai	Exact match	Denver, CO, United StatesHQ recorded Sep 6, 2026	501-1,000	576 contacts →
	Exact match “SugarAI: the CRM that actually helps sellers sell.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
12	Adobe Marketo	Exact match	San Jose, CA, United StatesHQ recorded Sep 6, 2026	1,001-5,000	572 contacts →
	Exact match “Adobe Marketo Engage offers the leading Engagement Platform that empowers marketers to build brand value, grow revenue, and prove impact.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
13	The Pipeline Group	Exact match	San Jose, CA, United StatesHQ recorded Sep 6, 2026	201-500	523 contacts →
	Exact match “The Pipeline Group helps B2B tech companies scale pipeline fast through our SDR-as-a-Service model.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
14	Infoanalytica, INC	Exact match	San Jose, CA, United StatesHQ recorded Sep 6, 2026	201-500	482 contacts →
	Exact match “InfoAnalytica is a B2B sales acceleration partner for mid-market and enterprise companies.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
15	Smarte	Exact match	Sunnyvale, CA, United StatesHQ recorded Sep 6, 2026	51-200	480 contacts →
	Exact match “At SMARTe, we understand the challenges faced by revenue-generating teams.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
16	Saleshive	Exact match	Denver, CO, United StatesHQ recorded Sep 6, 2026	51-200	455 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
17	Invoca	Exact match	West Hollywood, CA, United StatesHQ recorded Sep 6, 2026	201-500	368 contacts →
	Exact match “Invoca is the revenue execution and platform leader that helps marketing, commerce, and contact center teams turn every conversation into revenue.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
18	Callrail	Exact match	Atlanta, GA, United StatesHQ recorded Sep 6, 2026	201-500	332 contacts →
	Exact match “CallRail is the lead engagement platform that makes it easy for businesses to attract more leads, convert more customers, and optimize their marketing.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
19	NOOKS	Exact match	San Francisco, CA, United StatesHQ recorded Sep 6, 2026	51-200	318 contacts →
	Exact match “Nooks is the Agent Workspace for intelligent outbound.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
20	Aviso AI	Exact match	Redwood City, CA, United StatesHQ recorded Sep 6, 2026	201-500	297 contacts →
	Exact match “Aviso delivers Agentic AI that turns insights into autonomous actions, giving GTM teams precision, speed, and control to drive predictable growth at scale.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
21	Vinsolutions By COX Automotive	Exact match	Mission, KS, United StatesHQ recorded Sep 6, 2026	501-1,000	292 contacts →
	Exact match “VinSolutions is automotive CRM software designed to help dealerships turn shopper behavior into action-and results.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
22	Warrior Plus	Exact match	Henderson, NV, United StatesHQ recorded Sep 6, 2026	n/a	260 contacts →
	Exact match “Best-in-class sales & marketing automation platform and marketplace for digital business owners and online marketers” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
23	Bigtincan	Exact match	Waltham, MA, United StatesHQ recorded Sep 6, 2026	201-500	249 contacts →
	Exact match “Bigtincan is now officially part of Showpad.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
24	Convoso	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 6, 2026	201-500	241 contacts →
	Exact match “Convoso is an AI-powered contact center platform built for revenue teams and customer engagement organizations expanding into outbound growth.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
25	Tacton	Exact match	Chicago, IL, United StatesHQ recorded Sep 6, 2026	201-500	232 contacts →
	Exact match “Tacton is a leading SaaS company redefining buyer engagement for manufacturers of complex products.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “sales engagement platform developers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 1,479 sales engagement platform developers based in the United States

See the full list, filter by size, metro and specialty, and access 12,884 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Sales engagement platform developers based in the United States at a glance

As of Sep 6, 2026

33.3%Verified-email coverage

26.0%Mobile-number coverage

26.1Average contacts per company

1-10Median size (employees)

9.9%Largest-city concentration · San Francisco

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

800

11-50

493

51-200

136

201-500

501-1,000

1,001-5,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

11,9020–30

82331–60

661–90

490–180

149180+

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with the United States whose business descriptions match “sales engagement platform developers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 12,884 professional contacts with verified work emails across the full matched dataset. 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 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Sales engagement platform developers by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “sales engagement platform developers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sales engagement platform developers are there based in the United States?

RevenueBase identified 1,479 company matches for sales engagement platform developers associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Klaviyo tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most sales engagement platform developers?

San Francisco leads with 146 company records, followed by New York (112) and Los Angeles (46).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 12,884 professional contacts with verified work emails tracked across these 1,479 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 6, 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.