Transactional email APIs · #16 of 16 · ↑ SparkPost
Plunk
Plunk ranks #16 of 16 in transactional email apis in the week of 28 September 2026, with a visibility score of 1 across ChatGPT, Claude, Gemini and Perplexity. It was named in 3% of the answers we sampled.
sampled: 3 of 4 assistants this week
Plunk barely registers on AI assistants' radar in the Transactional email APIs category, named in just 3 of 62 answers overall. Claude gives it a score of 4 out of 100, while ChatGPT and Perplexity both score it 0. When it does show up, it's a single mention each for best transactional email APIs, best email API for Next.js or serverless apps, and best developer experience. It's never named for webhooks, high-volume low-cost sending, cheap scaling, open-source/self-hosted options, or deliverability. Right now, Plunk is a long shot in this space.
this is mine claim it, free, forever. We also check whether ChatGPT and Claude can read useplunk.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 | #11.5 |
| Gemini | not sampled this week | ||
| Perplexity | 0 | 0% of answers |
Questions you win
| question | named in | best spot |
|---|---|---|
| What's the best email API for a Next.js or serverless app? | 1 of 3 | #5 |
| Which transactional email provider has the best developer experience? | 1 of 4 | #5 |
| What are the best transactional email APIs? | 1 of 4 | #18 |
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 |
| 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 with React or JSX email templates? | Resend, Postmark |
| 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 service for sending receipts and order confirmations? | Postmark, Resend, Amazon SES |
| 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
- Gemini“However: Many developers use SES wrapped in a modern DX layer like Plunk (open-source) or by pairing SES with the React Email rendering engine.”
- Claude“Loops / Plunk — Worth a look if you want transactional and marketing/lifecycle emails in one place for a SaaS.”
- Claude“Loops, AhaSend, Plunk — smaller, newer players with good pricing and DX if you're not risk-averse.”
Closest rivals
All Plunk alternatives · Full Transactional email APIs leaderboard · Sources