Company lists · Data refreshed September 2026

Top 25 Email engagement platform developers based in the United States

Name: Email 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 28, 2026 840 companies tracked

RevenueBase identified 840 email engagement platform developers headquartered in the United States as of September 2026 and tracks 35,915 professional contacts across them, including 17,127 with verified work emails. New York is the largest hub.

This list covers email engagement platform developers 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

840Companies

35,915Contacts tracked

17,127Verified emails

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

Ranked by team size

Top 25 of 840 email engagement platform developers 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 email engagement platform developers: 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	Partial evidence	Cambridge, MA, United StatesHQ checked Sep 28, 2026	5,001-10,000	11,077 contacts →
	Partial 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	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
4	Intuit Mailchimp	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,483 contacts →
	Indirect evidence “The Mailchimpossibilities are endless when you create, automate, and optimize your marketing with Mailchimp.” Source: RevenueBase Database · checked Sep 28, 2026
5	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
6	Marigold	Indirect evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	201-500	820 contacts →
	Indirect evidence “Marigold is a global marketing technology company focused on delivering relationship marketing solutions for growing organizations.” Source: RevenueBase Database · checked Sep 28, 2026
7	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
8	Movable INK	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	672 contacts →
	Partial evidence “Movable Ink helps marketers create more relevant customer experiences across email, mobile, and web through data activation, AI-powered decisioning, and personalization at scale.” Source: RevenueBase Database · checked Sep 28, 2026
9	Adobe Marketo	Strong evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	572 contacts →
	Strong 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
10	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
11	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
12	AUGEO	Partial evidence	Rochester, NY, United StatesHQ checked Sep 28, 2026	501-1,000	359 contacts →
	Partial 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
13	Listrak	Partial evidence	Lititz, PA, United StatesHQ checked Sep 28, 2026	201-500	295 contacts →
	Partial evidence “Listrak is the person-first marketing automation platform that seamlessly integrates data, identity, and cross-channel messaging to power hyper-personalized customer experiences.” Source: RevenueBase Database · checked Sep 28, 2026
14	Act-On Software	Partial evidence	Portland, OR, United StatesHQ checked Sep 28, 2026	201-500	210 contacts →
	Partial evidence “Act-On Software provides the innovative marketing automation platform for marketers who think big and act boldly.” Source: RevenueBase Database · checked Sep 28, 2026
15	Remarkable AI	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	51-200	197 contacts →
	Indirect evidence “Our mission is to solve customer experience.” Source: RevenueBase Database · checked Sep 28, 2026
16	Outboundengine	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 28, 2026	201-500	181 contacts →
	Indirect evidence “We believe every business deserves great marketing.” Source: RevenueBase Database · checked Sep 28, 2026
17	Sendpulse	Strong evidence	New York, United StatesHQ checked Sep 28, 2026	51-200	180 contacts →
	Strong evidence “SendPulse is an AI-driven marketing platform that helps scaling businesses automate email and chatbot conversations.” Source: RevenueBase Database · checked Sep 28, 2026
18	Stirista	Partial evidence	San Antonio, TX, United StatesHQ checked Sep 28, 2026	51-200	163 contacts →
	Partial evidence “Stirista is the only company that combines data, email, and digital execution to help clients acquire and retain customers by creating a data-driven, repeatable, and scalable…” Source: RevenueBase Database · checked Sep 28, 2026
19	Icontact	Indirect evidence	Morrisville, NC, United StatesHQ checked Sep 28, 2026	51-200	137 contacts →
	Indirect evidence “We believe powerful connections propel business growth.” Source: RevenueBase Database · checked Sep 28, 2026
20	CLICK	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	201-500	130 contacts →
	Indirect evidence “Click is the only complete marketing technology solution that is natively integrated with Microsoft Dynamics CRM.” Source: RevenueBase Database · checked Sep 28, 2026
21	Mailerlite	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	122 contacts →
	Partial evidence “In 2005, we started as a web design agency, but we soon discovered email marketing and fell in love with it.” Source: RevenueBase Database · checked Sep 28, 2026
22	Targetbay	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	51-200	118 contacts →
	Partial evidence “TargetBay is the all-in-one marketing and customer engagement suite designed for ecommerce businesses looking to accelerate growth.” Source: RevenueBase Database · checked Sep 28, 2026
23	Benchmark Email	Partial evidence	St Louis, MO, United StatesHQ checked Sep 28, 2026	51-200	115 contacts →
	Partial evidence “Benchmark helps busy marketers move faster and make a bigger impact with email.” Source: RevenueBase Database · checked Sep 28, 2026
24	DRIP	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 28, 2026	51-200	111 contacts →
	Partial evidence “Build brand love with our marketing automation platform.” Source: RevenueBase Database · checked Sep 28, 2026
25	Doppler	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 28, 2026	51-200	106 contacts →
	Indirect evidence “Plataforma de Marketing Multicanal, simple y potenciado por IA.” 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: email engagement platform developers. 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 email engagement platform developers.
Partial evidence: Its own public description names part of email engagement platform developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name email engagement platform developers. 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 840 email engagement platform developers based in the United States

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

As of Sep 28, 2026

47.7%Verified-email coverage

42.8Average contacts per company

11-50Median size (employees)

7.9%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

414

11-50

291

51-200

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 840 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 email engagement platform developers, 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 “email engagement platform developers”. 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 email engagement platform developers), 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 email engagement platform developers, 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, 17,127 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.

Email engagement platform developers 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 email engagement platform developers, 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 email engagement platform developers are there based in the United States?

RevenueBase identified 840 email engagement platform developers 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 email engagement platform developers?

New York leads with 66 headquartered companies, followed by San Francisco (36) and Austin (25).

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 17,127 verified decision-maker contacts tracked across these 840 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.