head to head · open source
Plunk vs AgentMail
Plunk has 5,474 GitHub stars, 401 forks, 61 open issues and last shipped 4 days ago. AgentMail has 38 stars, 17 forks, 3 open issues and last shipped 2 days ago. Plunk leads on adoption by 14,305% (5,474 vs 38 stars). Plunk is written in TypeScript under AGPL-3.0; AgentMail is written in TypeScript under MIT. Plunk has attracted 7% as many forks as stars, AgentMail 45%. AgentMail was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Plunk | AgentMail | |
|---|---|---|
| GitHub stars | ★ 5.5K | ★ 38 |
| License | AGPL-3.0 | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-14 | 2026-09-16 |
| Forks | ⑂ 401 | ⑂ 17 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Plunk if
- You weight community size — 5.5K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick AgentMail if
- You want the AgentMail feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and AgentMail fits your workflow better
About Plunk
Plunk is an open source email platform written in TypeScript and released under the AGPL 3.0 license. It combines transactional email, marketing campaigns, and workflow automation in a single system, and it is positioned as a self hosted alternative to SendGrid, Resend, and Mailgun. The project lives in the TypeScript and Node.js ecosystem, ships as a Docker image, and is documented at docs.useplunk.com with a community Discord for support.
read the full Plunk overview →
About AgentMail
AgentMail is a TypeScript client library and inbox API for AI agents and workflows, aimed at developers who need to give agents their own email inboxes rather than route everything through a human mailbox.
read the full AgentMail overview →
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Frequently asked questions
Is Plunk or AgentMail more popular?
Plunk has 5,474 GitHub stars and AgentMail has 38. Plunk has the larger community by that measure.
Are Plunk and AgentMail free?
Both are open source. Plunk is licensed under AGPL-3.0 and AgentMail under MIT. Neither carries a licence fee.
What is the difference between Plunk and AgentMail?
Plunk is written in TypeScript and AgentMail in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Plunk or AgentMail?
Choose Plunk if you want the larger community (5,474 stars) or its AGPL-3.0 licence terms. Choose AgentMail if its feature set, stack or MIT licence fits better. Both are self-hostable.