Courier vs Plunk
as AI assistants see them, week of 2026-09-28
Courier and Plunk both show up on the edges of AI answers about transactional email, each named in just 3 of 62 responses. Courier scores 2 overall (0 ChatGPT, 4 Claude, 3 Perplexity), while Plunk sits slightly lower at 1 overall (0 ChatGPT, 4 Claude, 0 Perplexity). Head-to-head, it's a wash: Courier leads in 2 questions, Plunk leads in 2, and the two tie in 16. Both get a mention for "best transactional email APIs," but neither appears for deliverability, high-volume or low-cost sending, self-hosting, or webhook-related questions. Not exactly a rivalry with much heat behind it yet.
Head to head
| metric | Courier | Plunk |
|---|---|---|
| score | 2 | 1 |
| questions won | 3 | 3 |
By assistant
Courier
| 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 |
Plunk
| 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 |
Where they differ
Only Courier gets named for
- What's the best email service for sending receipts and order confirmations?
- What's the best email API with React or JSX email templates?
Only Plunk gets named for
- What's the best email API for a Next.js or serverless app?
- Which transactional email provider has the best developer experience?
More comparisons
- Courier vs SparkPost
- Courier vs Scaleway TEM
- Courier vs Loops
- Courier vs Elastic Email
- Plunk vs SparkPost
- Plunk vs Scaleway TEM
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