Litmus shows you exactly how your designs look on every platform, across every popular web browser. (And the not-so-popular ones.)
Cost / License
- Paid
- Proprietary
United KingdomPlatforms
- Online
SendLint AlternativesEmail Marketing Services and other similar apps like SendLint
SendLint is described as 'Autonomous QA agent that runs the full QA cycle for email campaigns against each client's own standards' and is a Email Marketing service in the business & commerce category. There are eight alternatives to SendLint, not only websites but also apps for a variety of platforms, including SaaS, PHP, Java and Node.JS apps. The best SendLint alternative is Litmus. It's not free, so if you're looking for a free alternative, you could try Unspam.email or MailSlurp: Developer Email API. Other great sites and apps similar to SendLint are Email on Acid, Inbox Pirates, MailMoxie and Preflight.
Alternatives list
52 Email on Acid alternativesCreate a virtual simulation of your email in the top 15, most used email clients! Our Email Acid Test will analyze your code and identify exactly which HTML tags and/or CSS properties are not supported by each email client.
Unspam.email is an online spam tester tool for emails. It helps to improve the deliverability and reputation of your email campaigns.
Cost / License
- Freemium
- Proprietary
Platforms
- Online
Create email addresses on demand. Send and receive real emails and attachments from code. Rest API and developer kits available.
Cost / License
- Freemium
- Proprietary
Application type
Platforms
- Online
- Ruby
- C#
- Laravel
- JavaScript
- Software as a Service (SaaS)
- PHP
- Java
- Node.JS
Inbox Pirates lets you preview, test, and analyze your email on various devices, and popular email clients. It also offers subject line and email content testing to improve email open rates.
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MailMoxie is an advanced Email Governance platform designed for the 2026 inbox landscape. It serves as a diagnostic layer for your marketing stack, ensuring every email you send is technically perfect and accessible to all.
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Preflight helps companies prevent sensitive data from leaking into AI tools, monitoring, blocking, and redacting prompts in real time, while generating compliance audit trails.
Cost / License
- Paid
- Proprietary
Platforms
- Online
- Software as a Service (SaaS)
AI-powered email QA tool that catches typos, broken links, layout issues, and tone problems before send at a fraction of Litmus or Email on Acid's cost.
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United States
Canada
