Clay
AI Personalized Outbound at Scale
Postmark
Email for web applications
Updated February 2026
| Clay | Postmark | |
|---|---|---|
| Rating | 4.9★ | 5.0★ |
| Reviews | 39 | 17 |
| Pros | 17 | 9 |
| FactScore™ | 77.7 | 62.8 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in Clay — Pros
Prospecting Data enrichment Time-saving Lead generation AI-powered features Automation Sales productivity Support team Multiple data sources Scalability User-friendly interface CRM integration Community engagement Free tier Customization Personalization Strong education supportBoth 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 Clay — Cons
Learning curve Complex setup Glitchy performanceBoth tools — Cons
—Only in Postmark — Cons
—Details
| Clay | Postmark | |
|---|---|---|
| Categories | Email marketing, Marketing automation platforms, Lead generation software, Sales enablement, AI sales tools | Email clients, Email marketing |
| Platforms | Web | Web · iOS |
| Became Popular | February 8, 2022 | July 23, 2014 |
| Website | www.clay.com | postmarkapp.com |
Who Should Pick Which?
Choose Clay if...
- Prospecting
- Data enrichment
- Time-saving
Choose Postmark if...
- Reliable email delivery
- Fast performance
- Human support
With a FactScore™ of 77.7 vs 62.8, Clay leads in community reception. Clay uniquely offers Prospecting and Data enrichment, while Postmark stands out for Reliable email delivery and Fast performance.
What Users Say
Clay
The best damn lead gen product in the market. We exclusively recommend Clay at Smartlead! Simple reason...nothing beats the product. Best feeling running a query and then seeing all the data popula...
man that's sick, meeting all my needs and expectations for such a tool if not exceeding that. It is stable, super powerful and easy to learn because of the design being user-centric. What drives th...
This product made my prospecting so much easier and actually kinda fun. I don't remember how many people I have already recommended this. Can't wait for the affiliate program to be set up haha! Awe...
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, Clay or Postmark?
Based on FactScore™, Clay leads with a score of 77.7 vs 62.8. Clay has a higher rating of 4.9★ compared to 5.0★.
What are the pros of Clay compared to Postmark?
Clay uniquely offers: Prospecting, Data enrichment, Time-saving, Lead generation, AI-powered features.
What are the pros of Postmark compared to Clay?
Postmark uniquely offers: Reliable email delivery, Fast performance, Human support, Transactional email, Affordable pricing.
Is Clay better rated than Postmark?
Clay is rated 4.9★ from 39 reviews. Postmark is rated 5.0★ from 17 reviews.
What is the FactScore™ of Clay and Postmark?
FactScore™ weighs rating and review volume together. Clay scores 77.7 and Postmark scores 62.8.
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