Resend
The email API for developers — send transactional and marketing email that reaches inboxes, not spam folders.
Resend is an email platform built for developers who want sending email to feel like using a modern API product. You integrate with a few lines of code using official SDKs for Node.js, Python, Ruby, Go, PHP, and more, and build templates in React with the open-source React Email library that the same team maintains. Resend focuses heavily on deliverability — domain authentication with SPF, DKIM, and DMARC guidance, a clean sending infrastructure, and detailed logs, webhooks, and analytics for every message. Beyond transactional email like password resets and receipts, Resend also supports marketing broadcasts and audience management, so a product team can run both kinds of email from one place. A free tier of 3,000 emails per month makes it easy to start small and scale up.
Pros
- Excellent developer experience with clean docs and SDKs
- React Email integration makes templates maintainable
- Generous free tier of 3,000 emails per month
Cons
- Younger sending infrastructure than veterans like SendGrid or Postmark
- Marketing automation features are lighter than dedicated ESPs
MailerSend
Transactional email service built for teams — send via API or SMTP with drag-and-drop templates and strong deliverability.
MailerSend is a transactional email and SMS service from the team behind MailerLite, designed so both developers and non-technical teammates can work with sending. Developers integrate through a REST API, SMTP relay, and official SDKs, while designers and support staff manage templates with a drag-and-drop builder — no deploy needed to tweak an email. The platform covers the production essentials: inbound email routing, webhooks, suppression management, dedicated IPs, and analytics on deliveries, opens, and clicks. Built on infrastructure refined over a decade of email sending, MailerSend emphasizes deliverability and offers verified domains with SPF, DKIM, and DMARC guidance. A free tier of 3,000 emails per month and volume-based pricing make it a popular, cost-effective alternative to SendGrid and a frequent comparison point with Resend.
Pros
- Free tier of 3,000 emails per month
- Template builder makes emails maintainable by the whole team
- Competitive volume pricing
Cons
- Developer experience is less polished than Resend's
- Advanced features like dedicated IPs require higher tiers