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We Reviewed the Best Email Testing Tools in 2024

Recent studies show that you could see a return of almost $36 for every dollar spent on an email marketing campaign. While this figure represents an incredible opportunity, it’s far from what most email marketing campaigns deliver.

That’s where email testing tools come in. These tools can narrow the gap and bring you closer to achieving your desired ROI. With an email testing tool, you can create email campaigns that perform well, look great, and bypass pesky spam filters. 

Most popular email testing tools today come with a host of benefits. They not only help manage your inbox, but also create compelling content, test subject lines, and design emails that stand out. They can also help you zero in on the perfect newsletter templates

In this post, we’ll review the 10 best email testing tools available in 2024. Let’s dive in.

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What Should You Look for In Email Testing Tools?

When evaluating email testing tools, here are certain key features to look out for:

  • Compatibility and rendering: Choose an email testing tool that shows how your email will look across various clients and devices. This is crucial because emails from popular email service providers such as Gmail, Outlook, or mobile devices can appear differently on different email clients
  • Spam testing: Ensure your emails reach their intended recipients and are not flagged as spam. Therefore, your chosen tool should be able to assess your subject line, email content, and sender reputation to ensure high deliverability rates 
  • Link and image validation: Opt for a tool that identifies broken links and image issues, to ensure seamless inbox management. If they also offer inbox insights and email preview, even better
  • Load time analysis: Ensure your email testing tool analyzes elements that impact load time, such as image size and external scripts. This helps reduce abandonment rates—a critical factor for those managing meeting invites and other time-sensitive emails 
  • User interface and ease of use: A testing tool that is easy to navigate and use, even for those who are not technically inclined, can improve email productivity
  • Integration capabilities: You should also consider how well the tool integrates with your current email marketing platform and other tools. Smooth integration can further streamline your workflow
  • Customer support: Look for tools offering robust customer support, including tutorials, customer service, chat support, and troubleshooting help. Good support is invaluable, especially when dealing with complex email management issues
  • Feedback and collaboration features: Pick a tool that allows users to collaborate on activities such as sharing tests and gathering feedback. This is especially important if you work in a team 

Select a tool that captures all or at least most of the factors above, and you’ll be on your way to creating highly effective email campaigns.

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The 10 Best Email Testing Tools to Use in 2024

The competition among email testing software will be stiff in 2024. Nevertheless, we’ve unearthed 10 of the best email testing tools in the market today. 

1. Litmus

via Litmus

Litmus offers user-friendly email marketing software with powerful testing features. It helps preview how your emails appear in a recipient’s inbox across 90 apps and devices so that you can identify and rectify any display inconsistencies. It also provides tips to send error-free emails.  

Litmus also simplifies quality assurance by automatically checking links, images, and key elements for a near-flawless presentation. 

Moreover, Litmus checks the accessibility of your content, ensuring it’s navigable for all users, including those with disabilities.

Litmus best features

  • Preview emails across various platforms and devices
  • Automate quality checks for links and images
  • Ensure accessibility in email content
  • Run advanced spam tests to improve email deliverability
  • Integrate it seamlessly with other marketing tools 

Litmus limitations

  • The app may be clunky to use in Chrome
  • Only paid plans are available

Litmus pricing

  • Litmus Basic: $99/month per user
  • Litmus Plus:  $199/month per 5 users
  • Enterprise: Custom pricing

Litmus ratings and reviews

  • G2: 4.6/5 (380+ reviews)
  • Capterra: 4.6/5 (30+ reviews)

2. Mail-Tester

Mail-Tester is a free email testing tool that you can use to test your email deliverability. To use this email preview tool, you simply send your emails to a designated address provided by Mail-Tester. The tool then scans various aspects of your email, including the message content, mail server, and sending IP, to evaluate its spam score.

Upon completing the analysis, you receive a detailed report highlighting areas of appropriate configuration and suggesting improvements where needed. This user-friendly tool effectively enhances the delivery of your emails to users’ inboxes, thus mitigating the risk of them being flagged as spam or relegated to the junk folder.

Additionally, Mail-Tester is useful for verifying the status of your SPF (Sender Policy Framework) and DKIM (Domain Keys Identified Email) records, conducting tests on your mail server and IP address, and identifying any spam-related content that may adversely impact your email delivery. 

Mail-Tester best features

  • Test your SPF & DKIM records for optimal email authentication
  • Verify the integrity of your IP address and ensure secure email communication
  • Conduct thorough tests on your mail server to optimize its performance
  • Receive detailed configuration reports to identify and implement improvements
  • Collaborate seamlessly with SpamAssassin to enhance spam detection and prevention in your emails using Mail-Tester’s features

Mail-Tester limitations

  • Users can perform only 3 tests for free within 24 hours

Mail-Tester pricing

  • 50 €: 500 tests
  • 80 €: 1,000 tests
  • 250 €: 5,000 tests
  • 700 €: 20,000 tests
  • 2,500 €: 100,000 tests
  • 20,000 €: 5000 tests
  • 200 €: 1,000,000 tests

Mail-Tester’s ratings and reviews

  • G2: N/A
  • Capterra: N/A

3. Wormly

via Wormly

Wormly offers a no-frills approach to email testing. Its email testing platform focuses on uptime monitoring and metrics tracking to reduce downtime and thus enhance revenue potential. 

It delivers high-resolution monitoring in 5-second intervals to rapidly detect issues. Moreover, the tool’s advanced metrics for services like Nginx, Apache, PHP-APC, and Postfix are popular among users.

Wormly delivers swift failure notifications through various channels, including SMS and Slack, so you can quickly respond to issues. 

When conducting email deliverability tests, this email testing tool simplifies the process by asking you to input basic details like your email service provider hostname or IP, email address, and TCP port to initiate testing. This straightforward approach helps you monitor and maintain your email infrastructure with ease. 

Wormly best features

  • Monitor various protocols, including HTTPS, IPv6, SMTP, POP3, IMAP, FTP, and more for comprehensive coverage
  • Get instant failure alerts through SMS, Slack, Telegram, voice calls, etc.
  • Create multiple user accounts for your entire team
  • Prevent cascading alerts and maintain accurate alerting through host dependency
  • Generate detailed uptime reports with SLA metrics for performance tracking

Wormly limitations

  • May have resource limits on lower-tier plans
  • Needs more technical knowledge for setup and customization, which could be a hurdle for less tech-savvy users

Wormly pricing

  • Startup: $44/month per user
  • Agency: $107/month per 3 users
  • DevOps: $221/month per 10 users
  • Enterprise: $562/month per 50 users

Wormly ratings and reviews

  • NA

4. Email on Acid

Email on Acid is also a practical tool for testing and refining your marketing emails. It lets you preview your emails and identify elements leading to spam filters.

The user-friendly platform includes several intuitive features that you can use to perfect your emails. So you can share your test emails with others, gather approvals, and collect comments all in one place, making email testing a collaborative process. 

Moreover, Email on Acid goes beyond just checking your email content. It includes features to check if your domain is on any blocklists, so you can ensure your emails don’t land in the spam folder. 

Additionally, this email testing tool offers useful analytics like read times, engagement heatmaps, recipient devices, etc., so you can optimize your campaigns further. The platform also helps you check the visual presentation of emails across various devices and platforms. Therefore, emails will look as intended, no matter where they’re opened. 

Finally, Email on Acid simplifies email campaign workflows with features like campaign prechecks, URL validation, and image optimization so you can get your emails sent out faster.

Email on Acid’s best features

  • Ensure consistency in email appearance across different devices and platforms
  • Validate URLs and optimize images for better email performance
  • Run essential checklists, including UTM validation and ADA compliance as well
  • Improve email deliverability with spam checks and access to blacklisted domains
  • Facilitate email list verification against over 20 popular spam filters

Email on Acid limitations

  • No free version
  • Rendering can be inconsistent

Email on Acid pricing

  • Basic: $74/month per user
  • Premium: $134/month per 3 users
  • Enterprise: Custom pricing

Email on Acid ratings and reviews

  • G2: 4.5/5 (40+ reviews)
  • Capterra: 4.4 (25+ reviews)

5. Brevo

via Brevo

Brevo, formerly Sendinblue, is an email marketing platform that integrates various features essential for effective email campaign management. However, its core functionalities are creating, sending, and monitoring email campaigns. 

Brevo’s user interface is designed for easy navigation, with a clean layout that gives you access to contacts, campaigns, and conversations. The platform’s drag-and-drop email editor further simplifies the email creation process. 

Brevo also offers over 40 responsive email templates, making it easy to design professional-looking emails. Additionally, the platform allows for detailed customization of email elements, including text, fonts, colors, and links.

One of Brevo’s key strengths is email deliverability. To this end, Brevo deploys various methods, including spam filter navigation and maintaining the sender’s reputation, that ensure your emails reach the primary inbox. 

Brevo also supports email list segmentation for targeted marketing efforts and offers automation features for more efficient campaign management.​

Brevo best features

  • Run multi-channel email campaigns with advanced segmentation
  • Send emails with high deliverability rates
  • Explore a wide range of email marketing customizations and features
  • Work efficiently with its user-friendly dashboard and readymade templates

Brevo limitations

  • Limited integrations compared to some competitors
  • Can be difficult to set up for some users

Brevo pricing

  • Free forever
  • Starter: $25/month
  • Business: $65/month
  • BrevoPlus: Custom pricing

Brevo ratings and reviews

  • G2: 4.5/5 (680+ reviews)
  • Capterra: 4.6/5 (1,920+ reviews)

6. GlockApps

GlockApps is a sophisticated email testing and analytics platform that improves email deliverability and sender reputation. 

Designed especially for marketers, IT professionals, and email campaign managers, this tool provides detailed insights into how emails are processed by different Internet Service Providers (ISPs) and email clients. 

GlockApps identifies potential deliverability issues by simulating email sending, allowing users to preemptively address them before launching live campaigns. The simulation identifies spam triggers, provides spam score ratings, and also analyzes email content for elements impacting deliverability. 

Additionally, GlockApps monitors sender reputation—a crucial factor in email deliverability—and offers comprehensive feedback on authentication protocols like SPF, DKIM, and DMARC. 

With its intuitive interface and robust analytics, GlockApps is an essential email testing tool for optimizing email campaigns.

GlockApps best features

  • Assess how emails perform across different email providers
  • Detect and correct elements in emails that may trigger spam filters
  • Get insights on how to optimize email content so you can increase open and click-through rates
  • Get notified about deliverability issues over Slack and email 
  • Maintain a strong sender reputation for better email deliverability long-term

GlockApps limitations

  • Relatively higher prices, which could be a barrier for small businesses or individual users
  • Some users expect more granularity in Gmail inbox placement

GlockApps pricing

  • Free forever
  • Essential: $85/month
  • Growth: $142/month
  • Enterprise: $185/month

GlockApps ratings and reviews

  • G2: 4/5 (10+ reviews)
  • Capterra: 4.8/5 (35+ reviews)

7. Stripo

Stripo email
via Stripo

Stripo is a dynamic email design platform tailored for teams seeking to craft responsive emails effortlessly, regardless of their HTML expertise. 

At its core is a user-friendly drag-and-drop email template editor, complemented by pre-built basic blocks to create attractive emails without coding. Additionally, Stripo was among the first to adopt AMP for email technology, enhancing its interactive email capabilities.

Stripo also streamlines the email design process with automated workflows and custom module libraries. 

It also offers extensive personalization options, including custom HTML for added interactivity.  In addition, it supports email export, conversion tracking, and seamless integration with over 60 ESPs/CRMs. 

With this versatility, users can integrate emails into automation systems with a simple click.

Stripo best features

  • Utilize drag-and-drop editing and basic blocks for easy and coding-free email creation
  • Implement AMP for Email for more engaging, dynamic email content
  • Test and preview emails across 90+ platforms 
  • Embed custom HTML code and access over 1,000 free, responsive, ready-to-use templates for tailored email experiences
  • Connect with over 60 ESPs/CRMs for efficient email automation and tracking

Stripo limitations

  • You require premium access to use multiple templates
  • No dark mode preview is available

Stripo pricing

  • Free forever
  • Basic: $15/month per user
  • Premium: $45/month per 3 users
  • Pro: $95/month per 10 users

Stripo ratings and reviews

  • G2: 4.8/5 (130+ reviews)
  • Capterra: 4.9/5 (70+ reviews)

8. Mailtrap

Mailtrap is an advanced email sandbox designed to inspect and debug emails in staging, development, and QA environments. This tool ensures that emails are scrutinized and perfected before reaching their final recipients. 

This email testing tool is a secure testing ground for users to preview emails, check their spam scores, and verify HTML/CSS integrity. Mailtrap’s capability to display how emails render across various email clients, including web, iOS, and Android, is particularly beneficial.

By incorporating a fake SMTP server, Mailtrap creates a safe testing environment so that you can avoid unintentional email sending to actual customers. The tool is also automation-friendly, simplifying the process of email testing in staging environments. 

Moreover, its robust testing API enhances its functionality.

Mailtrap supports QA automation and offers integrations with popular programming languages like Ruby, Python, PHP, Node.js, and .Net. In addition, it offers multiple inboxes for different projects and includes comprehensive user management and Single Sign-On (SSO) options.

Mailtrap best features

  • Utilize a fake SMTP server for safe email testing
  • Check and validate HTML code and CSS for consistency
  • Identify emails that are likely to go into spam folders
  • Enable clear previews of emails to ensure quality before sending
  • Integrate with Ruby, Python, PHP, Node.js, .Net, and more

Mailtrap limitations

  • Not a good choice for bulk emails as it can slow down the process 
  • The pricing is relatively high

Mailtrap pricing

  • Free forever
  • Individual: $14.99/month per user
  • Team: $34.99/ month per 20 users
  • Business: $64.99/month per 40 users
  • Premium: $129.99/month per 80 users 
  • Enterprise: $399.99/month per 999 users

Mailtrap ratings and reviews

  • G2: 4.8/5 (55+ reviews)
  • Capterra: 5/5 (30+ reviews) 

9. Moosend

Moosend, a versatile email marketing service, offers various tools to create, automate, test, and send email campaigns. 

This email testing software excels in email creation, lead generation, and list management. It also stands out with its sophisticated design and delivery testing capabilities. In addition, you can preview emails across devices and gauge how your emails perform against popular spam filters. 

With integrated A/B testing tools and analytics, Moosend provides comprehensive insights into email campaign performance, further augmented by seamless integrations with various email testing and verification tools. 

Moosend best features

  • Test and view email designs on both desktop and mobile devices
  • Utilize the content spam testing feature to evaluate email compatibility with popular spam filters
  • Access detailed analytics and metrics to gauge the success of email campaigns
  • Implement A/B testing tools for optimizing email content and strategy
  • Connect with various email testing and verification tools to enhance campaign effectiveness

Moosend limitations

  • No free plan 
  • Somewhat slower user interface compared to other email testing tools
  • Some say Moosend has limited analytics capabilities

Moosend pricing

  • Free 30-day trial
  • Pro: $9/month
  • Enterprise: Custom Pricing

Moosend ratings and reviews

  • G2: 4.6/5 (650+ reviews)
  • Capterra: 4.6/5 (190 reviews)

10. SocketLabs

SocketLabs is a robust email delivery engine designed to streamline the sending of both marketing and transactional emails. 

It offers an advanced email delivery service through a flexible API compatible with all the usual developer languages. SocketLabs is a user-friendly email marketing tool that can enhance user engagement. Among its core features are high deliverability and reliable performance. In addition to email parsing and real-time alerts, the tool provides an email health score across 30+ data points. 

SocketLabs also boasts robust analytics, empowering various teams to make data-driven decisions. Also, for businesses that need to send vast volumes of emails, its on-premise solutions offer a perfect blend of speed, customizability, and scalability, ensuring efficient delivery of transactional emails. 

SocketLabs best features

  • Stay assured of enterprise-level security and user permissions
  • Send email safely and scalably through a flexible and advanced API
  • Understand and optimize email performance with StreamScore
  • Tailor on-premise solutions for high-volume, scalable email delivery

SocketLabs limitations

  • Has a complex interface and lacks multi-user access
  • Some users say reports need to be more detailed and show delivery and failures in real-time

SocketLabs pricing

  • Core: $39.95/month
  • Pro: $79.95/month
  • Enterprise: Custom pricing
  • Suite: Custom pricing

SocketLabs ratings and reviews

  • G2: 4.5/5 (40+ reviews)
  • Capterra: 4.6/5 (10+ reviews)
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Other Email Management Tools

While these platforms focus on email testing and effective delivery, email management tools like ClickUp offer more AI-powered features to streamline your creative workflow, improve collaboration, and handle email campaigns. 


Get an all-in-one view to better anticipate and organize your daily work, reminders, and calendar events with ClickUp Home

ClickUp is a versatile, dynamic project management and collaboration tool suitable for teams of all sizes and from various industries. ClickUp Workspace uniquely integrates email management within its platform, allowing users to send and receive emails directly, thus eliminating the need to switch between different tools. 

For those juggling multiple projects—something that email designers and marketers can surely relate to—this means less context-switching and, therefore, more productivity.

You can also use the innovative ClickUp AI to draft engaging emails, create copy variations for A/B tests, build questionnaires, and more.

Whether you’re an individual, part of a team or an entire organization, ClickUp can be easily customized to simplify your job strategizing and executing email campaigns. 

Maximizing email productivity with ClickUp

Tackle your tasks with the revamped ClickUp Inbox—designed to to swiftly navigate through your priorities and get work done

But ClickUp doesn’t just excel in project management. We understand that running email campaigns means juggling multiple moving parts. So, ClickUp Views lets you customize your workflows to manage tasks more efficiently and increase productivity. 

You can choose from over 15 custom views to organize and view your work in a way that suits you best. Personalize every aspect of your ClickUp Workspace with Custom Fields to get what you need, whether it’s an email campaign to 50 people or 5000.

ClickUp’s email project management feature seamlessly blends email correspondence with overall project management. With a fluid transition between managing emails and overseeing project tasks, ClickUp is an excellent choice for teams seeking an all-in-one solution. 

Moreover, it’s one of the best email alternatives that lets you communicate with your team faster without leaving your work platform. You can start a chat with one or more people, instantly exchange messages, quickly share updates in real-time, link resources, and consolidate team communication all in one place.

ClickUp best features

  • Send emails and attachments directly from within ClickUp
  • Receive emails within ClickUp, link them to tasks, and notify or assign team members
  • Automate emails based on specific events, fields, and form submissions
  • Promote real-time collaboration and communication among team members
  • Integrate seamlessly with a vast array of applications, such as Google Drive, Slack, Hubspot, OneDrive, Dropbox, and others
  • Use pre-built automation to streamline repetitive tasks and maintain consistent processes
  • Leverage ClickUp AI to generate error-free emails, ideate campaign strategies, and automate responses
  • Choose from over 1,000 customizable productivity templates suitable for various teams and scenarios

ClickUp limitations

  • Some users report a learning curve due to the number of available features

ClickUp pricing

  • Free Forever
  • Unlimited: $7/month per user
  • Business: $12/month per user
  • Enterprise: Contact for pricing
  • ClickUp Brain: AI can be added to any Workspace for $5 per member

ClickUp ratings and reviews

  • G2: 4.7/5 (6,000+ reviews)
  • Capterra: 4.7/5 (3,000+ reviews)
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Email Testing is a Top Priority

Email is still a top performer when it comes to effective marketing channels. But if done poorly, it’s a waste of your marketing dollars. Therefore, you need a comprehensive solution that helps your team ideate, create, and track engaging email content your customers love and respond to. And ClickUp is that solution. 

Neglecting proper email testing software can lead to adverse outcomes, from missing key marketing strategy KPIs to potential legal issues.

However, a tool like ClickUp offers a holistic approach to managing emails. ClickUp’s versatility and efficient inbox management features help you optimize your email management workflows for maximum efficiency. Sign up with ClickUp for a free trial today.

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