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Top 21 Email Testing Software Companies (August 2026)

As of August 2026, Latka tracks 21 email testing software companies. They have combined revenues of $81.4M and employ 565 people. They have raised $11.1M and serve 1.2M customers combined.

Every company below sells email testing software to other businesses and is ranked by its most recent annual revenue. Revenue, funding, headcount and customer figures come from CEO interviews on the Latka podcast, public company filings, and Latka estimates where a company has not disclosed a number.

What Email Testing Software Companies do

Email Testing Software helps organizations verify the functionality, accuracy, and reliability of their email communications before executing campaigns. This category of software is crucial for ensuring that emails render correctly across various clients and devices, and that they pass through spam filters to reach recipients' inboxes. Users commonly adopt these tools to conduct pre-send testing, A/B testing, and analyze deliverability metrics to improve email marketing strategies. Typical features of email testing software include previewing email displays on different devices and clients, spam filter testing, validation of links and images, and analysis of email content for compliance with best practices. Buyer personas often include marketing professionals, content creators, and IT specialists responsible for maintaining email channel integrity. The primary use case is to enhance the overall effectiveness of email campaigns by identifying potential issues before the emails are dispatched.

Companies
21
Revenue
$81.4M
Funding
$11.1M
Employees
565

Filters

Sorting: Highest -> Lowest

Filters

Top Email Testing Software Companies by revenue

Showing 10 of 21 companies ranked by annual revenue.

1Flodesk logo
Flodesk

San Francisco, California, United States

Flodesk is a bootstrapped email marketing and e-commerce platform built for small business owners, solopreneurs, photographers, coaches, and creative service providers. Founded in 2019 by Rebecca Shostak, Martha Bitar, and Trong Dong, the company offers a flat-rate subscription model with unlimited subscribers and unlimited sends, positioning itself as the design-forward, price-stable alternative to legacy email platforms that charge more as lists grow. The company reached approximately $27 million in annual recurring revenue as of May 2024, up from $20 million a year prior and $10 million in 2021, a figure it hit roughly 18 to 19 months after launch on $90,000 of founder bootstrap capital and zero outside funding. With 80,000 paying customers, 50 full-time employees, and a gross monthly churn rate of approximately 2 percent, Flodesk generates roughly $540,000 of revenue per employee and is profitable. Growth has been driven primarily by a structured affiliate program that accounts for more than 30 percent of inbound traffic, a viral email footer loop, influencer co-marketing at launch, and organic search. The company launched a second product, Checkout, approximately 18 months before the May 2024 interview, adding a sales-funnel capability that serves as an upsell to the core email product. Flodesk spends approximately $700,000 per quarter on paid advertising and targets a nine-month CAC payback period.

Revenue
$27M
Customers
80K
Year founded
2019
Team size
50
2Goodsalesemails logo
Goodsalesemails

San Francisco, California, United States

Good Sales Emails is a website that provides resources and examples of effective sales emails from various companies. It offers insights and tips on crafting successful sales emails.

Revenue
$10.6M
Year founded
2017
Team size
100
3zerobounce logo
zerobounce

Santa Barbara, California, United States

Our Email Validation Service quickly and accurately removes invalid, disposable, spam traps, abusive and other harmful email addresses. 98% Accuracy Guaranteed. Try our Free Trial now!

Revenue
$10M
Customers
100K
Year founded
2015
Team size
20
4usebouncer.com logo
usebouncer.com

Wroclaw, Lower Silesian District, Poland

Bouncer is a company that provides powerful and affordable email list verification and email validation. Simple App and easy-to-integrate API. 99.99% availability. GDPR compliant by design! We protect our customers from bounced back emails and by that: - secure their reputation as a sender, - ensure continuity of the communication with their customers and partners, - minimize the cost related to an outdated database of contacts, - maximize reach to their customers and partners. Check our website for more details.

Revenue
$7.5M
Year founded
2017
Team size
68
5SendPulse logo
SendPulse

New York, New York, United States

Maximizing Email Open Rates

Revenue
$5.8M
Customers
1M
Year founded
2015
Funding
$130K
Team size
159
6GlockApps logo
GlockApps

Pinedale, Wyoming, United States

GlockApps Software is a privately held company that offers multiple email marketing solutions to help businesses reach the inbox and solve email deliverability issues. We designed our tools to make it simple for every marketer to test their email placement across global providers, control email authentication, and solve deliverability issues before sending. Our team of email marketing experts also offers consulting and comprehensive deliverability audits with personalized recommendations to help you increase your revenue from email marketing.

Revenue
$5.3M
Year founded
2009
Team size
26
7L-Soft logo
L-Soft

Bethesda, Maryland, United States

Engage your audiences and boost your organization’s impact with email newsletters, discussion groups and opt-in email marketing campaigns. Do it all with the highest level of subscriber permission and best practices, plus new tools to help with EU GDPR data privacy requirements. Get in touch—we’re here to help you make a difference with email. Celebrating 35 years of powering people and communications, L-Soft is your source for #LISTSERV®, the original email list management solution, invented by the company’s founder and CEO Eric Thomas. Since 1986, 3,700+ business, government, educational, and non-profit organizations worldwide have trusted LISTSERV because it’s reliable, flexible and gets results.

Revenue
$3.3M
Year founded
1994
Team size
30
8Scalero logo
Scalero

San Francisco, California, United States

Email marketing studio, helping companies get more out of email through software and services.

Revenue
$3M
Year founded
2019
Team size
27
9Dyspatch logo
Dyspatch

San Francisco, California, United States

Two products to help everyone email better.

Revenue
$2.5M
Customers
200
Year founded
2014
Funding
$11M
Team size
22
10Folderly logo
Folderly

Dover, Delaware, United States

Email Deliverability Platform

Revenue
$1.6M
Customers
100
Year founded
2019
Team size
30

Frequently asked questions about Email Testing Software Companies

How many email testing software companies are there?

Latka tracks 21 email testing software companies with reported revenue. Together they generate $81.4M in annual revenue and employ 565 people.

Which email testing software company is the largest?

Flodesk is the largest, with $27M in annual revenue, founded in 2019.

How much revenue does a typical email testing software company make?

The average email testing software company in this list makes $3.9M a year, across 21 companies with reported revenue. They serve 1.2M customers combined.

Who are the leading Email Testing software vendors?

Ranked by annual revenue, the leaders are Flodesk, Goodsalesemails, zerobounce, usebouncer.com and SendPulse.

How much funding have email testing software companies raised?

The 21 email testing software companies tracked here have raised $11.1M in disclosed funding between them.

Related Marketing Software categories

Inclusion Criteria

- Must provide functionality for simulating and analyzing email campaigns - Should include tools for A/B testing and multi-device previews - Must offer spam filter and deliverability testing capabilities - Should validate email content for compliance with industry standards - Must not only focus on email marketing automation; must also enable comprehensive testing and analytics