Company lists · Data refreshed September 2026

Top 25 User engagement software developers worldwide

Name: User engagement software developers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 1,104 companies tracked

RevenueBase identified 1,104 user engagement software developers worldwide as of September 2026 and tracks 41,190 professional contacts across them, including 20,373 with verified work emails and 10,759 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers user engagement software developers worldwide, 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 6, 2026. Country and city lists for user engagement software developers follow the table.

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 6, 2026 86% judged on-target in blind review

1,104Companies

41,190Contacts tracked

20,373Verified emails

10,759Mobile numbers

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The 25 largest user engagement software developers worldwide

Ranked by team size

Top 25 of 1,104 user engagement software developers worldwide, ranked by team size, largest first. Data refreshed Sep 6, 2026. RevenueBase Smart Search rates how each company's information relates to user engagement software 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 6, 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 6, 2026
2	Zeta Global	Indirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,595 contacts →
	Indirect evidence “At Zeta Global (NYSE: ZETA), we help enterprise brands and agencies Achieve the Impossible™ with superintelligent marketing.” Source: RevenueBase Database · checked Sep 6, 2026
3	BRAZE	Partial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,142 contacts →
	Partial 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 6, 2026
4	Optimizely	Indirect evidence	New York, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,584 contacts →
	Indirect evidence “Optimizely is the AI platform for marketing, built for the experience-makers who shape how brands show up in the world.” Source: RevenueBase Database · checked Sep 6, 2026
5	Moengage	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 6, 2026	501-1,000	908 contacts →
	Partial evidence “MoEngage is an agentic customer engagement platform for the customer-obsessed marketers and product owners.” Source: RevenueBase Database · checked Sep 6, 2026
6	Moloco	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 6, 2026	501-1,000	893 contacts →
	Indirect evidence “Moloco’s mission is to be the scaling engine for the internet economy, applying AI to help businesses of all sizes grow.” Source: RevenueBase Database · checked Sep 6, 2026
7	Marigold	Indirect evidence	Nashville, TN, United StatesHQ checked Sep 6, 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 6, 2026
8	Iterable	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 6, 2026	501-1,000	771 contacts →
	Partial 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 6, 2026
9	Khoros	Partial evidence	Austin, TX, United StatesHQ checked Sep 6, 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 6, 2026
10	Applovin	Indirect evidence	Palo Alto, CA, United StatesHQ checked Sep 6, 2026	201-500	733 contacts →
	Indirect evidence “AppLovin helps businesses of any size reach over a billion people who play mobile games every day.” Source: RevenueBase Database · checked Sep 6, 2026
11	Movable INK	Indirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	501-1,000	672 contacts →
	Indirect 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 6, 2026
12	On24	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 6, 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 6, 2026
13	PIANO	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 6, 2026	501-1,000	603 contacts →
	Indirect evidence “Piano is the digital analytics and subscription management platform that empowers businesses to understand their audience, orchestrate journeys, and grow revenue.” Source: RevenueBase Database · checked Sep 6, 2026
14	Optimove	Indirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	501-1,000	588 contacts →
	Indirect evidence “Optimove, the creator of Positionless Marketing, frees marketing teams from the limitations of fixed roles, giving every marketer the power to execute any marketing task instantly…” Source: RevenueBase Database · checked Sep 6, 2026
15	Adobe Marketo	Partial evidence	San Jose, CA, United StatesHQ checked Sep 6, 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 6, 2026
16	Acoustic	Indirect evidence	Conway, AR, United StatesHQ checked Sep 6, 2026	501-1,000	539 contacts →
	Indirect evidence “Acoustic, L.P.” Source: RevenueBase Database · checked Sep 6, 2026
17	Dotdigital	Indirect evidence	London Bridge, United KingdomHQ checked Sep 6, 2026	201-500	491 contacts →
	Indirect evidence “Dotdigital is a human-first marketing platform that helps you connect with your customers on the channels they know and love.” Source: RevenueBase Database · checked Sep 6, 2026
18	Mastercard Dynamic Yield	Indirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	501-1,000	489 contacts →
	Indirect evidence “Mastercard Dynamic Yield helps businesses deliver digital customer experiences that are personalized, optimized, and synchronized.” Source: RevenueBase Database · checked Sep 6, 2026
19	Branch	Indirect evidence	Mountain View, CA, United StatesHQ checked Sep 6, 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 6, 2026
20	customer.io	Partial evidence	Portland, OR, United StatesHQ checked Sep 6, 2026	201-500	446 contacts →
	Partial evidence “Create personalized customer journeys that engage and convert with our versatile customer engagement platform.” Source: RevenueBase Database · checked Sep 6, 2026
21	Resulticks	Partial evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	201-500	375 contacts →
	Partial 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 6, 2026
22	MAPP	Indirect evidence	London, United KingdomHQ checked Sep 6, 2026	201-500	373 contacts →
	Indirect evidence “Mapp helps marketers build personalized customer experiences through our SaaS platform, Mapp Marketing Cloud.” Source: RevenueBase Database · checked Sep 6, 2026
23	AB Tasty	Indirect evidence	Paris, FranceHQ checked Sep 6, 2026	201-500	334 contacts →
	Indirect evidence “At AB Tasty, we’re your partner for pushing great ideas even further through optimization.” Source: RevenueBase Database · checked Sep 6, 2026
24	Higher Logic	Partial evidence	Arlington, VA, United StatesHQ checked Sep 6, 2026	201-500	306 contacts →
	Partial evidence “Higher Logic is revolutionizing engagement for associations and businesses.” Source: RevenueBase Database · checked Sep 6, 2026
25	Claritas	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 6, 2026	201-500	299 contacts →
	Indirect evidence “Claritas: Empowering Data-Driven Marketing With nearly 50 years of understanding the American consumer, Claritas offers a comprehensive marketing optimization platform.” Source: RevenueBase Database · checked Sep 6, 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: user engagement software 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 user engagement software developers.
Partial evidence: Its own public description names part of user engagement software developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name user engagement software 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 1,104 user engagement software developers worldwide

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User engagement software developers worldwide at a glance

As of Sep 6, 2026

49.5%Verified-email coverage

26.1%Mobile-number coverage

37.3Average contacts per company

11-50Median size (employees)

6.6%Largest-city concentration · London

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

533

11-50

396

51-200

121

201-500

501-1,000

1,001-5,000

5,001-10,000

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 user engagement software 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.
Coverage: 10 countries, largest first: the United States, the United Kingdom, India, Canada, Brazil, France, Australia, the Netherlands, Germany, Israel. Country and city lists for user engagement software developers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “user engagement software 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 user engagement software 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 user engagement software developers, and records with no verified work email.
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, 20,373 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 between September 6, 2026 and September 14, 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.

User engagement software developers by location

12 lists · largest first

Every User engagement software developers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 user engagement software 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 user engagement software developers are there worldwide?

RevenueBase identified 1,104 user engagement software developers worldwide 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 country has the most user engagement software developers?

The United States leads with 537 companies, followed by the United Kingdom (121) and India (99). Every user engagement software developers list by country and city is linked on this page.

Which city has the most user engagement software developers?

London leads with 73 headquartered companies, followed by New York (58) and San Francisco (31).

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 20,373 verified decision-maker contacts tracked across these 1,104 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 6, 2026 and September 14, 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.