Resend vs Postmark
A detailed comparison of Resend and Postmark for sending transactional emails. Which email API is right for your application?
Overview
Both Resend and Postmark provide email APIs for sending transactional emails from applications. Resend and Postmark each have strengths — Resend is known for its developer experience, while Postmark offers different pricing and feature trade-offs. AISend combines the best of both with AI-powered delivery optimization on top.
Features comparison
Key differences between Resend and Postmark: API design and developer experience, deliverability features, analytics and monitoring, custom domain support, webhook event tracking, and pricing structure. Both providers offer REST APIs and SDKs, but differ in their approach to deliverability. Consider AISend as a third option — it adds AI-powered routing and optimization on top of a Resend-compatible API.
Pricing
Pricing is a major factor when choosing an email API. Compare the free tiers, per-email costs at different volumes, and what features are included in each plan. AISend offers 1,000 emails/month free with all AI features included. Pro plans start at $29/month for 25,000 emails. Both Resend and Postmark offer competitive pricing. AISend's pricing is transparent with no hidden fees, and AI features are included at every tier.
Which should you choose?
If you're choosing between Resend and Postmark, consider also evaluating AISend. It offers AI-powered features that neither Resend nor Postmark provide — intelligent provider routing, deliverability scoring, and send time optimization — with a Resend-compatible API that makes switching easy.