Transactional email APIs · #2 of 16 · ↑ Postmark · ↓ Amazon SES
Resend
Resend ranks #2 of 16 in transactional email apis in the week of 28 September 2026, with a visibility score of 61 across ChatGPT, Claude, Gemini and Perplexity. It was named in 73% of the answers we sampled.
sampled: 3 of 4 assistants this week
Resend shows up in 46 of 62 answers across the transactional email APIs category, landing a score of 76 with ChatGPT, 69 with Claude, and 39 with Perplexity, for an overall of 61. It's a near-lock for certain questions: named in all 4 answers for "best transactional email APIs," all 4 for "best developer experience," and all 3 each for webhook support, cheap sending at scale, and Next.js/serverless use cases. Where it doesn't appear at all is open-source or self-hosted email servers, and tools for previewing emails before sending — two areas where assistants simply never bring it up.
this is mine claim it, free, forever. We also check whether ChatGPT and Claude can read resend.com.
Who's talking about you
| 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 |
Questions you win
| question | named in | best spot |
|---|---|---|
| What are the best transactional email APIs? | 4 of 4 | #1 |
| What's the best email API for developers? | 3 of 3 | #1 |
| What's the best email API in 2026? | 3 of 3 | #1 |
| Which email API has the best free tier? | 3 of 3 | #1 |
| Which transactional email provider has the best developer experience? | 4 of 4 | #1 |
| What's the best email API for a Next.js or serverless app? | 3 of 3 | #1 |
| What's the best email API with React or JSX email templates? | 3 of 3 | #1 |
| What's the cheapest way to send transactional email at scale? | 3 of 3 | #2 |
| What's the best email API with webhooks for bounces and opens? | 3 of 3 | #2 |
| What's the best alternative to SendGrid? | 2 of 3 | #1 |
| Which transactional email service is best for a startup? | 2 of 3 | #1 |
| What's the best SMTP service for an app? | 2 of 3 | #1 |
| What's the best way to send password reset and verification emails from my app? | 2 of 3 | #2 |
| What's the best email service for sending receipts and order confirmations? | 2 of 3 | #2 |
| What's the best transactional email provider for high volume at low cost? | 2 of 3 | #2 |
| Which email API has the best deliverability? | 2 of 3 | #3 |
| What's the best email API that also handles marketing campaigns? | 2 of 3 | #4 |
| What's the best email API for a European company that needs EU data hosting? | 1 of 3 | #9 |
Questions you lose
| question | who got named instead |
|---|---|
| What's the best open-source or self-hosted transactional email server? | Postal |
| What's the best tool to test and preview emails before sending? | nobody in particular |
Assistants cited 10 pages for questions in this category that name your rivals and not you. Claim to see them. See all sources for Transactional email APIs.
In their words
- ChatGPT“If you specifically want one platform that provides both a developer-friendly email API and marketing campaigns, I’d focus on Brevo, Twilio SendGrid, and Customer.io rather than API-only providers such as Resend or Postmark.”
- Claude“Resend — Best developer experience of the group (React Email, clean SDKs), with an EU region available.”
- Gemini“When evaluating Developer Experience (DX) for transactional email, the consensus among modern developers points to two clear leaders depending on your tech stack: Resend (for modern, full-stack JavaScript/TypeScript applications) and Postmark (for unmatched reliability, deep debugging, and tradition”
Closest rivals
All Resend alternatives · Full Transactional email APIs leaderboard · Sources