Plunk review (2026): is the free plan enough?
Open-source email platform for transactional and marketing mail
Black Friday: is there a Plunk sale?
Plunk report card
Good · out of 4.0 · graded Nov 13, 2026
Best for open-source email sending at $0.001 an email
Plunk covers transactional email, campaigns and workflows against one contact list, and bills $0.001 per email with no monthly fee. The free plan stops at 1,000 emails a month with Plunk branding on every message.
Who Plunk is for
- Fits if you send a few thousand emails a month and want pay-as-you-go
- Works for developers who might self-host it later
Who Plunk is not for
- Tight if you send more than 1,000 emails a month on the free plan, which also adds Plunk branding
- Pricey if your volume grows, since it is a flat $0.001 on every email
- Watch out: self-hosting under AGPL-3.0 carries that licence's obligations
- Watch out: the hosted service runs in the EU
Why Plunk gets a 2.6
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- BValue for moneyNo monthly fee; $0.001 per email, so 10,000 emails cost $10, near the cheapest quarter of $9 for sending tools. Cost grows with volume.
- CFree plan and trialFree for 1,000 emails a month with unlimited contacts and every feature, but emails carry Plunk branding.
- BFeaturesTransactional email, campaigns, workflows, segments and inbound email. The listing shows no gap in the core job.
- CEase of useNo store rating on record. It is built for developers and can be self-hosted under AGPL-3.0.
- BPlatforms and integrationsWeb, with Amazon SES and Docker listed. No apps, and the hosted service is in the EU.
What these grades rest on. Graded from this listing, whose facts were read from Plunk's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. How we review and grade.
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<a href="https://toolgpa.com/tools/plunk#review"><img src="https://toolgpa.com/badge/plunk.svg" alt="Plunk: 2.6 GPA on ToolGPA" width="196" height="56"></a>Where Plunk stands among email sending services
Plunk's GPA of 2.6 is higher than 34 of the 50 other email sending services we grade, and level with 11.
It stands best on features (B, above 30 of 50) and worst on ease of use (C, above 7).
Each grade against the category
Every bar is all 51 email sending services we grade, cut by the letter each got. Plunk’s own letter is outlined.
- BValue for moneyAbove 25 of 50, level with 18
- CFree plan and trialAbove 11 of 50, level with 23
- BFeaturesAbove 30 of 50, level with 20
- CEase of useAbove 7 of 50, level with 43
- BPlatforms and integrationsAbove 17 of 50, level with 32
Keep Plunk, or make your own?
Keep it
To replace Plunk you would be making mail servers with a good name among inbox providers. That is not a weekend's work, with an AI app builder or without one.
It is one of the better ones too: its GPA of 2.6 is higher than 34 of the 50 other email sending services we grade. Plunk is open source, so there is a third way: take its code and run it yourself.
What you could not
- Mail servers with a good name among inbox providers.
- Newsletters sent to thousands of people that still reach the inbox.
- Connections to other products, each kept working as those products change.
- The depth: we grade its features B, which means it covers the whole job.
What this rests on. Plunk’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
What is Plunk?
Plunk is an open-source email platform that covers transactional email, campaigns and event-triggered workflows against one contact list. The hosted version runs in the EU and bills per email sent rather than per contact, and the same code can be self-hosted under the AGPL-3.0 license.
Worth knowing
- The free plan stops at 1,000 emails a month and puts Plunk branding on emails.
- The paid plan has no monthly fee: it is $0.001 per email, so cost scales directly with volume.
- The hosted service is in the EU; self-hosting under AGPL-3.0 carries that license's obligations.
Key features
- Transactional email
- Send single emails through a REST API or an SMTP relay, from your own domain with DKIM signing.
- Campaigns and newsletters
- Broadcasts go to the whole contact list or to a segment, with a visual and an HTML editor and open and click tracking.
- Workflows
- Event-triggered sequences with delays, conditions and webhook steps, started by something a contact does in your product.
- Segments
- Dynamic segments are queries that re-run each time they are used, so a campaign reaches the current audience.
- Inbound email
- Addresses at your domain can receive mail, and replies become contacts that can start workflows.
- Self-hosting
- The code is open source under AGPL-3.0 and can be deployed with Docker Compose on your own servers.
Plunk pricing
As of Nov 13, 2026, Plunk has a free plan, and paid plans start at $0.001 per email sent.
- Starts at
- $0.001 per email sent
- Free plan
- 1,000 emails per month with unlimited contacts and every feature, with Plunk branding on emails.
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| Free forever | $0 | 1,000 emails a month and unlimited contacts. Every feature is included, but emails carry Plunk branding. |
| Pay as you grow | $0.001per email sent, no monthly fee | Removes the Plunk branding and the 1,000-email cap, with a monthly spend cap you can set. The vendor's example shows 10,000 emails costing $10. |
Read from useplunk.com on Nov 13, 2026. Prices change, so confirm with Plunk before you buy.
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Free trial
Common questions
Does Plunk have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. Plunk is listed for Web.
Does Plunk have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. Plunk is listed for Web.
Is Plunk open source?
Yes. Plunk is open source, according to its own site. It can also be run on a server of your own.
Does Plunk have an API?
Yes. Plunk offers a public API, according to its own site.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Nov 13, 2026.