Mailtrap vs. TestSubject Comparison


Mailtrap Railsware	TestSubject ZURB	+	+
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About Mailtrap is an email delivery platform for developers and product teams, providing a flexible RESTful API and SMTP service to send emails at scale. The platform is built with a focus on high inboxing rates, fast delivery, and 24/7 technical support from deliverability experts. Mailtrap ensures 99.99% uptime with dedicated IPs, auto warm-up, and sender reputation protection. Developers can integrate quickly using SDKs for major languages (Python, Ruby, PHP, etc.) and manage high-volume sending with a customizable API. The platform provides industry-best analytics with helicopter-view dashboards to monitor key metrics and 30-day logs for easy debugging. Trusted by over 150,000 monthly active users including Yelp, PayPal, Atlassian, and Adobe.	About Most people decide to open an email based on two factors, the sender name and the subject line. Mobile email clients and devices often truncate subject lines and sender names, leading to sometimes hilarious but frequently disastrous results. Cringeworthy, right? We send a lot of email here at ZURB, and we needed a way to help compose perfect subject lines quickly and easily. Unable to find anything that fit the bill, we created TestSubject. TestSubject is a simple tool for testing how your email subject line and sender name look on the most popular mobile devices and email clients. Just copy and paste your text and you’ll get instant previews. Test before you send for more peace of mind. Test how your subject line displays on the most popular mobile devices and email clients. View how your sender name displays on the most popular mobile devices and email clients.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported
Audience Digital products’ dev and marketing teams that send high-volume emails with a focus on high deliverability.	Audience Anyone searching for a tool for testing how their email subject line and sender name look on the most popular mobile devices and email clients
Support Phone Support Not Supported 24/7 Live Support Supported Online Supported	Support Phone Support Supported 24/7 Live Support Not Supported Online Supported
API Offers API Supported	API Offers API Not Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing $15/month Mailtrap offers transparent and flexible plans to cover the needs of your business, separated into Email API/SMTP (includes Email Marketing) and Email Sandbox. Email API/SMTP - send transactional & promo emails - Free: 3,5K emails/mo - Basic: from $15/mo and from 10,000 emails - Business: from $85/month and from 100,000 emails - Enterprise: from $750/month and from 1.5 million emails - Custom: Tailored for high-volume senders with dedicated support. Email Sandbox - test your emails - Free: 50 test emails/mo - Basic: $17/mo (or $14/mo, billed annually) - Team: $42/mo (or $34/mo, billed annually) - Business: $123/mo (or $99/mo, billed annually) - Enterprise: $498/mo (or $399/mo, billed annually) Free Version Supported Free Trial Not Supported	Pricing No information available. Free Version Not Supported Free Trial Not Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software

Training Documentation Supported Webinars Not Supported Live Online Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information Railsware Founded: 2007 United States mailtrap.io	Company Information ZURB Founded: 1998 United States zurb.com/playground/testsubject
Alternatives Debug Mail DebugMail.io	Alternatives Mizy
MailHog	Inbox Pirates Crewcharge Technologies
MaxBulk Mailer Maxprog	Litmus Litmus Software
Maileroo	SubjectLine
SendGrid Twilio SendGrid View All	LeadSparrow View All
Categories Email APIs Supported Email Deliverability Supported Email Testing Supported	Categories Email Testing Supported
Email Testing Features A/B Testing Not Supported Accessibility Testing Supported Deliverability Rates Supported DMARC Analytics Supported HTML Validation Supported Improvement Recommendations Supported IP Blacklist Checking Supported Pre-Send Email Testing Supported Preview Across Browsers & Devices Supported Reporting / Analytics Supported Sender Reputation Scoring Supported Spam Testing Supported Show More Features Email Deliverability Features Deliverability Alerts Supported Deliverability Reporting Supported DMARC Analytics Supported Email Address Verification Supported Email Content Testing Supported Email Previewing Supported Inbox Placement Testing Supported IP Blacklist Monitoring Supported Reputation Reporting Supported
Integrations AccessOwl Supported Cursor Supported Devin Desktop Supported Elixir Supported Heroku Supported Java Supported Laravel Supported Lovable Supported Node.js Supported PHP Supported Python Supported Ruby on Rails Supported Stripo.email Supported Supabase Supported Symfony Supported Tabular Supported Visual Studio Code Supported Zapier Supported n8n Supported v0 Supported Show More Integrations View All 26 Integrations	Integrations AccessOwl Not Supported Cursor Not Supported Devin Desktop Not Supported Elixir Not Supported Heroku Not Supported Java Not Supported Laravel Not Supported Lovable Not Supported Node.js Not Supported PHP Not Supported Python Not Supported Ruby on Rails Not Supported Stripo.email Not Supported Supabase Not Supported Symfony Not Supported Tabular Not Supported Visual Studio Code Not Supported Zapier Not Supported n8n Not Supported v0 Not Supported Show More Integrations
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