Side-by-side comparison of free tiers, pricing changes, and stability. Catalogue dates here run to 2026-09-21.
Quick Verdict: Resend offers 3K emails/month free with a modern developer experience. Postmark offers only 100 emails/month free but is legendary for deliverability. For free tier value, Resend wins decisively; for mission-critical transactional email at scale, Postmark has the track record.
Developer-first email API — 3K emails/month free (100/day cap), 3 domains, 1K marketing contacts/month, 5 AI credits, 30-day data retention
Key Differences
Free tier: Resend gives 3K emails/month — 30x more than Postmark's 100 emails/month. For testing and small projects, Resend's free tier is actually usable.
Deliverability: Postmark has built its reputation on industry-leading deliverability with dedicated IP pools and strict anti-spam policies. They reject marketing email entirely.
API design: Resend has a minimal, modern API with React Email support. Postmark has a mature API with message streams, webhooks, and inbound processing.
Philosophy: Postmark is transactional-only (no marketing). Resend is transactional-focused but more flexible with its sending policies.
Pricing Change History
Postmark
No recorded pricing changes for Postmark.
Resend
increaseddiscovered 2026-09-05 · effective date unknownmedium impact
The free tier now has a limit of 3,000 emails/month (100/day) and includes 3 domains. Previously 3K emails/month (100/day) and 1 domain. The free tier also includes ticket support, 10,000 automation runs, and 30-day data retention. Source ↗
Our Recommendation
Choose Resend if you want a generous free tier, modern DX with React Email, or you're building a side project that needs to actually send email for free.
Choose Postmark if deliverability is your #1 priority and you're willing to pay for it — Postmark's free tier is effectively a trial, not a production tier.
Resend offers 3K emails/month free with a modern developer experience. Postmark offers only 100 emails/month free but is legendary for deliverability. For free tier value, Resend wins decisively; for mission-critical transactional email at scale, Postmark has the track record.
What is Postmark's free tier?
Postmark offers a Free plan: Transactional email API — 100 emails/month free, never expires, no credit card required
What is Resend's free tier?
Resend offers a Free plan: Developer-first email API — 3K emails/month free (100/day cap), 3 domains, 1K marketing contacts/month, 5 AI credits, 30-day data retention
Should I choose Postmark or Resend?
Choose Resend if you want a generous free tier, modern DX with React Email, or you're building a side project that needs to actually send email for free. Choose Postmark if deliverability is your #1 priority and you're willing to pay for it — Postmark's free tier is effectively a trial, not a production tier.
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