MailSlurp
Modern Email APIs for Developers and QA teams.
Postmark
Email for web applications
Updated February 2026
| MailSlurp | Postmark | |
|---|---|---|
| Rating | 5.0★ | 5.0★ |
| Reviews | 1 | 17 |
| Pros | 0 | 9 |
| FactScore™ | 15.1 | 62.8 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in MailSlurp — Pros
No unique pros listedBoth tools — Pros
—Only in Postmark — Pros
Reliable email delivery Fast performance Human support Transactional email Affordable pricing Email templates Excellent documentation Simple API Spam filterOnly in MailSlurp — Cons
—Both tools — Cons
—Only in Postmark — Cons
—Details
| MailSlurp | Postmark | |
|---|---|---|
| Categories | Email clients, Testing and QA software | Email clients, Email marketing |
| Platforms | Web | Web · iOS |
| Became Popular | January 3, 2018 | July 23, 2014 |
| Website | www.mailslurp.com | postmarkapp.com |
Who Should Pick Which?
Choose MailSlurp if...
- No unique pros listed
Choose Postmark if...
- Reliable email delivery
- Fast performance
- Human support
With a FactScore™ of 15.1 vs 62.8, Postmark leads in community reception. MailSlurp uniquely offers No unique pros listed, while Postmark stands out for Reliable email delivery and Fast performance.
What Users Say
MailSlurp
ProxiedMail offers a much simpler UI and better PHP client
Postmark
We use Postmark to send emails and manage newsletters directly from BlogBowl. Big thanks to Postmark for their reliable API and top-notch deliverability, which makes sure your newsletters actually ...
We use Postmark not only for our emails, but also to power Ply's built-in dynamic email capabilities. It's reliable, well documented and most of all - comes with awesome human support.
Once you get familiar with Postmark's layouts and templates, the service is great for quickly creating email templates and sending them out using their simple API. The UI is simple and intuitive.
Related Comparisons
Frequently Asked Questions
Which is better, MailSlurp or Postmark?
Based on FactScore™, Postmark leads with a score of 62.8 vs 15.1. Postmark has a higher rating of 5.0★ compared to 5.0★.
What are the pros of MailSlurp compared to Postmark?
MailSlurp uniquely offers: No unique pros listed.
What are the pros of Postmark compared to MailSlurp?
Postmark uniquely offers: Reliable email delivery, Fast performance, Human support, Transactional email, Affordable pricing.
Is MailSlurp better rated than Postmark?
MailSlurp is rated 5.0★ from 1 reviews. Postmark is rated 5.0★ from 17 reviews.
What is the FactScore™ of MailSlurp and Postmark?
FactScore™ weighs rating and review volume together. MailSlurp scores 15.1 and Postmark scores 62.8.
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