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Plunk

Open-source email platform for transactional emails, automated workflows and broadcast campaigns, hosted or self-hosted.

Visit useplunk.com ↗Alternatives
Works with AI agents:llms.txt
Ask your AI about this, with this page as the source:ChatGPT ↗Claude ↗Perplexity ↗

Where it fits

Transactional Email · Open-source platformTransactional emails, event-triggered sequences and newsletters in one open-source tool, billed per email with no monthly fee.Trade-off: A small team and a smaller ecosystem than the established APIs; its old Node SDK is deprecated, so you call the REST API or SMTP.

How Plunk itself is built

3 tools, from its own code, website and Product Hunt page.

Hetzner CloudNext.jsVercel

Who uses it

5 makers' products, each linked to the source that shows it, and 2 open-source projects that declare it in their code.

The maker says so 4Subprocessor list 1Declared in code 2How evidence is collected →
TypeddTurn your social posts into blogs, newsletter & lead magnets

“Its the most affordable email platform. We integrate Plunk so you can send newsletters”

Transactional EmailMaker says so · source ↗
GojoLocal dictation and everyday Mac tools in your notch

“really nice platform for solo developers, lets you create unlimited projects and charges on a per email basis”

Transactional EmailMaker says so · source ↗

Open source: a project that declares Plunk as a dependency in its public code — verifiable, but not necessarily a live product.

What makers say

4 makers on why they use Plunk, in their own words on Product Hunt.

Its the most affordable email platform. We integrate Plunk so you can send newsletters
TypeddSep 2024 ↗
really nice platform for solo developers, lets you create unlimited projects and charges on a per email basis
GojoSep 2026 ↗
Plunk helps us stay in touch with our users with an easy to use interface.
Competitor ResearchJul 2024 ↗
We use plunk for our emails. It works and the pricing is fair!
KraterOct 2026 ↗

Loved and watch-outs

Themes that recur in makers' words and Hacker News comments, each linked to what it summarises, with how Product Hunt tags its reviews.

Alternatives to Plunk

All alternatives by situation →
ResendA modern developer API with email templates written as React components.Free tier944 makers · transactional email
PostmarkDeliverability when the mail has to arrive within seconds.Free tier615 makers · transactional email
MailgunHigh volume and inbound email parsing and routing.Free tier49 makers · transactional email
Amazon SESSending at high volume, where cost per email matters more than tooling.4 makers · transactional email
SendGridOne vendor for both jobs at large scale.1061 makers · transactional email
NodemailerSending email from Node.js through any SMTP server or provider, without tying your code to one vendor's SDK.Open sourceFree tier
useSendAn open-source Resend-style dashboard and API for transactional and marketing mail, on top of Amazon SES prices.Open sourceFree tier

On Product Hunt, people weigh it against: Loops, Resend, Postmark.

Questions makers ask about Plunk

Is Plunk free?

Yes — there is a free tier a small product can run on; paid use starts at $0.001 per email. source ↗

Is Plunk open source or self-hostable?

Open source, and you can self-host it. source ↗

Can AI coding agents work with Plunk?

It serves an llms.txt docs index.

Who uses Plunk?

5 makers' products we track, each with a source, and 2 open-source projects declare it in their code. source ↗