Transactional email APIs · #14 of 16 · ↑ Scaleway TEM · ↓ SparkPost
Courier
Courier ranks #14 of 16 in transactional email apis in the week of 28 September 2026, with a visibility score of 2 across ChatGPT, Claude, Gemini and Perplexity. It was named in 5% of the answers we sampled.
sampled: 3 of 4 assistants this week
Courier barely registers on AI assistants' radar in this category, named in just 3 of 62 answers overall. ChatGPT scored it 0, while Claude and Perplexity gave it 4 and 3 out of 100 respectively, adding up to an overall score of 2. When it does surface, it's a single mention each for best transactional email APIs, receipts and order confirmations, and React or JSX email templates — one answer apiece, out of three or four. It's never named for webhooks, high-volume pricing, cost at scale, self-hosted options, or deliverability. Right now, Courier is a minor footnote rather than a go-to pick.
this is mine claim it, free, forever. We also check whether ChatGPT and Claude can read courier.com.
Who's talking about you
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 0 | 0% of answers | |
| Claude | 4 | 10% of answers | #14.0 |
| Gemini | not sampled this week | ||
| Perplexity | 3 | 5% of answers | #5.0 |
Questions you win
| question | named in | best spot |
|---|---|---|
| What's the best email service for sending receipts and order confirmations? | 1 of 3 | #5 |
| What's the best email API with React or JSX email templates? | 1 of 3 | #9 |
| What are the best transactional email APIs? | 1 of 4 | #19 |
Questions you lose
| question | who got named instead |
|---|---|
| What's the best email API for developers? | Resend, Postmark, Mailgun |
| What's the best alternative to SendGrid? | Postmark, Amazon SES, Resend |
| Which email API has the best deliverability? | Postmark, Amazon SES, Mailtrap |
| What's the cheapest way to send transactional email at scale? | Amazon SES, MailerSend, Elastic Email |
| Which transactional email service is best for a startup? | Postmark, Resend, Amazon SES |
| What's the best email API in 2026? | Resend, Postmark, Amazon SES |
| Which email API has the best free tier? | Brevo, Resend, Mailjet |
| What's the best SMTP service for an app? | Postmark, Resend, Amazon SES |
| Which transactional email provider has the best developer experience? | Resend, Postmark, SendGrid |
| What's the best way to send password reset and verification emails from my app? | Postmark, Amazon SES, Resend |
| What's the best email API for a Next.js or serverless app? | Resend, Postmark, SendGrid |
| 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 |
| What's the best email API with webhooks for bounces and opens? | Postmark, Resend, Mailgun |
| What's the best transactional email provider for high volume at low cost? | Amazon SES, Resend, Elastic Email |
| What's the best email API that also handles marketing campaigns? | SendGrid, Brevo |
| What's the best email API for a European company that needs EU data hosting? | Brevo, Mailgun, Mailjet |
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
- Claude“Knock or Courier — worth a look if email is one channel among several (in-app, push, SMS) and you want notification routing, preferences, and batching handled for you.”
- Perplexity“| Best for multiple channels | Courier | Coordinates email with SMS, push, in-app, and collaboration-tool notifications.”
- Claude“Courier / Knock — not email providers but orchestration layers on top; useful if you're sending across email, SMS, push, and in-app and want unified templating and user preferences.”
Closest rivals
- Courier vs SparkPost2
- Courier vs Plunk1
- Courier vs Scaleway TEM3
- Courier vs Loops4
- Courier vs Elastic Email5
All Courier alternatives · Full Transactional email APIs leaderboard · Sources