head to head · open source
Plunk vs UnInbox
Plunk has 5,474 GitHub stars, 401 forks, 61 open issues and last shipped 4 days ago. UnInbox has 1,757 stars, 127 forks, 42 open issues and last shipped 7 months ago. Plunk leads on adoption by 212% (5,474 vs 1,757 stars). Plunk is written in TypeScript under AGPL-3.0; UnInbox is written in TypeScript under a custom or non-standard licence. Plunk has attracted 7% as many forks as stars, UnInbox 7%. Plunk 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 | UnInbox | |
|---|---|---|
| GitHub stars | ★ 5.5K | ★ 1.8K |
| License | AGPL-3.0 | Custom / other |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-14 | 2026-02-11 |
| Forks | ⑂ 401 | ⑂ 127 |
| 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 UnInbox if
- You want the UnInbox feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches TypeScript
- You evaluated both and UnInbox 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 UnInbox
UnInbox is an open source communication infrastructure project for teams and professionals, built in the TypeScript and Next.js ecosystem and positioned as a modern replacement for outdated email tools. It presents itself as a web application that reimagines email communication for current workflows, while still working with existing email infrastructure or replacing it entirely.
read the full UnInbox overview →
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Frequently asked questions
Is Plunk or UnInbox more popular?
Plunk has 5,474 GitHub stars and UnInbox has 1,757. Plunk has the larger community by that measure.
Are Plunk and UnInbox free?
Both are open source. Plunk is licensed under AGPL-3.0, and UnInbox has no licence declared in this registry. Both are free to self-host.
What is the difference between Plunk and UnInbox?
Plunk is written in TypeScript and UnInbox 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 UnInbox?
Choose Plunk if you want the larger community (5,474 stars) or its AGPL-3.0 licence terms. Choose UnInbox if its feature set, stack or Custom / other licence fits better. Both are self-hostable.