Email Testing Tools

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As a core component of an organization's marketing tech stack, Litmus allows users to create, personalize, test, review, and analyze every email sent.

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As a core component of an organization's marketing tech stack, Litmus allows users to create, personalize, test, review, and analyze every email sent.

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Everest (Return Path + 250ok)

Everest is an integrated email success platform providing crucial insights and deliverability guidance so users can reach more people, increase engagement, and improve efficiencies of their email programs. Everest helps to improve email deliverability by getting complete visibility…


Folderly is an AI-based email deliverability platform for monitoring, spam testing, and maintaining email deliverability by solving any spam issues. Folderly is supported by Belkins.

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Postmark from Wildbit in Philadelphia sends and tracks transactional emails.

Email on Acid

Email On Acid is an email marketing solution built as a standalone product and as an integration into marketing automation tools such as Salesforce Marketing Cloud and Marketo. It includes features such as collaboration, code analysis, and spam filter testing.


ZeroBounce is an email list validator that removes all invalid email addresses to prevent bounces and preserve the sender's reputation.


Designed as an email deliverability tool, InboxAlly specifically aims to prevent marketing emails from being redirected into spam folders, to enhance the likelihood of them being opened and further engaged with by recipients, with the goal of augmenting both open and click-through…

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Semplates is an email template service that helps companies to make the most of using Amazon SES - without coding or using the terminal. The platform with its drag-and-drop editor empowers users to create and manage templates for automated emails sent via AWS SES. This makes it easier…

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Mailinator is an enterprise-grade email & SMS workflow testing solution for QA Testers and developers, from Manybrain. Mailinator offers solutions designed to simplify QA testing and Dev/Ops.

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Mailosaur is a communication-testing platform that helps businesses capture, test, design, and analyze email and SMS messages. The platform enables QA and development teams to test critical communications such as two-factor authentication (2FA/MFA), password resets, and personalization.…

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PutsMail is an email testing tool originally developed by Pablo Cantero, a software developer based in São Paulo, Brazil, and later purchased by Litmus in 2014. The vendor describes it as a standalone, free tool for email designers to perform quick tests of their campaigns, and…

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An email and SMS API platforms for developer and QA testers. Test applications end-to-end with real email and TXT messages. Users can build complex messaging automations to support marketing and software development. MailSlurp can also be used to verify emails and improve deliverability.…

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MailTester is an email testing tool offered for free by WOOBEO of Lyon, France. According to their website, "Mail-tester will analyze your message, your mail server, your sending IP... and show you a detailed report of what's configured properly and what's not."

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What Are Email Testing Tools?

Most marketers have a set of core email tools they use to send out email drip campaigns, triggered emails, batch and blast emails, etc. These include an email service provider (or hosting) platform, email marketing software, email tracking, email deliverability, and email encryption tools, etc.

Email testing tools are another critical piece of any marketing professional’s email tech stack. These tools allow the user to test out their email design and layout across various device types, browsers, and platforms—before sending it. They also can do email accessibility testing, URL validation, and spam testing.

Some of the products in this category also focus on email deliverability metrics and tracking things like delivery rate, bounce rate, open rate, click-through rate, etc. Other products may offer more proofreading features that check for spelling and grammar.

The main goal of email testing software is to help guard against email failures like emails landing in a spam inbox, not rendering properly in certain email clients or browsers, strange email formatting, etc. This also helps ensure your email campaigns are performing well and will help maximize your campaign’s return on investment (ROI).

Email Testing Tools Features

Most email testing tools will have this core set of capabilities:

  • Pre-send email testing

  • Email preview across browsers & devices

  • HTML validation

  • Spam testing

  • Email deliverability rates

  • Email accessibility testing

  • Email sender reputation scoring

  • Email analytics dashboard

Some email testing products have additional features such as:

  • Email editor and proofreader

  • Email templates

  • Recommendations for improvements

  • Email content A/B testing

Email Testing Tool Comparison

Before deciding to purchase one email testing platform over another, consider these key factors:

  1. Free vs. paid: there are a bunch of free email testing tools available, but they usually have limited functionality or low email testing volume. For example, PutsMail (owned by Litmus) has a free HTML email sending tool, though users can only send emails to up to 10 recipients at a time. On the other hand, paid tools are more expensive by default but offer more functionality.

  2. Scope of the tool: are you looking for a testing tool that focuses on a specific type of testing or an email testing suite of tools that provides a range of email testing and analytics capabilities? Some tools focus on specific areas of email testing, like HTML validation, pre-send testing, email content and subject line testing, etc. These point solutions are more likely to be free or cheaper than larger platforms. But larger email testing suites like Litmus and Email on Acid offer a greater range of features.

Pricing Information

Prices for paid tools vary based on the number of users and the range of features included in the platform. Starting prices for email testing suite software range between $70-$90 per month and typically include between 1-3 users. The cost per month can range up to a few hundred dollars, with additional users costing more as well.

There are also various free email testing tools available, which typically have limited or ad hoc email testing functionality. Here are a few examples of free email testing tools:

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Frequently Asked Questions

Why use email testing tools?

Email testing tools help users make sure the emails they send render properly across email clients, device types, and web browsers. They can also help test email elements like HTML text and the email content and subject line. Some email testing tools also include email deliverability metrics (e.g. open rate, click-through rate, bounce rate, etc.) and proofreading tools.

But the main reason to use email testing tools is the ability to preview emails before sending them and test them out to ensure they don’t end up in spam inboxes.

What are the best email testing tool platforms?

Some of the most reviewed email testing tool platforms on TrustRadius include:

Visit TrustRadius’ email testing tools page to see alternatives to consider and compare top-rated products.

What are the best free email testing tools?

There several free email testing tools available, though each one tends to specialize in one specific area such as HTML validation or spam checking. They can be a great alternative to a paid tool for lightweight and ad hoc email testing. However, paid tools are more appropriate for most marketing business use cases.

Here are a few examples of robust free email testing tools:

How much do email testing tools cost?

Email testing tools can range from free or freemium up to multiple hundreds of dollars per month.

Most paid platforms have a starting cost of between $70-$90 per month for about 1-3 users. More advanced plans with additional features and users can cost anywhere from $200-$500 per month.