Postmark vs Resend
as AI assistants see them, week of 2026-09-28
Postmark edges out Resend overall, scoring 63 to 61, and shows up a bit more often too: 49 of 62 answers versus 46 of 62. Both get named in every answer to "best transactional email APIs," "best developer experience," "webhooks for bounces and opens," and "Next.js or serverless app" questions. Resend scores higher with ChatGPT (76 vs 62) but falls off a cliff with Perplexity (39 vs Postmark's 65). Head-to-head, Postmark leads in 7 questions, Resend in 3, with 10 ties. Neither gets named for "testing and previewing emails."
Head to head
| metric | Postmark | Resend |
|---|---|---|
| score | 63 | 61 |
| questions won | 18 | 18 |
By assistant
Postmark
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 62 | 75% of answers | #2.4 |
| Claude | 64 | 85% of answers | #3.2 |
| Gemini | not sampled this week | ||
| Perplexity | 65 | 75% of answers | #2.1 |
Resend
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 76 | 85% of answers | #1.8 |
| Claude | 69 | 90% of answers | #3.1 |
| Gemini | not sampled this week | ||
| Perplexity | 39 | 45% of answers | #2.1 |
Where they differ
Only Postmark gets named for
- What's the best open-source or self-hosted transactional email server?
Only Resend gets named for
- What's the best email API for a European company that needs EU data hosting?
More comparisons
- Amazon SES vs Postmark
- Postmark vs SendGrid
- Mailgun vs Postmark
- Brevo vs Postmark
- Amazon SES vs Resend
- Resend vs SendGrid
Not sold on either?
Scores count how often each assistant names a product, weighted by position. How the score works · Full Transactional email APIs leaderboard