head to head · open source
Plunk vs UnInbox
Plunk has 5,573 GitHub stars, 429 forks, 61 open issues and last shipped 2 days ago. UnInbox has 1,760 stars, 128 forks, 42 open issues and last shipped 9 months ago. Plunk leads on adoption by 217% (5,573 vs 1,760 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 8% 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 | ★ 5.6K | ★ 1.8K |
| License | AGPL-3.0 | Custom / other |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-01 | 2026-02-11 |
| Forks | ⑂ 429 | ⑂ 128 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Plunk if
- You weight community size — 5.6K 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 The Open Source Email Platform Introduction Transactional emails, marketing campaigns, and workflow automation — in one platform. Self hostable, $0.001 per email, no contact limits. An open source, self hosted alternative to tools SendGrid, Resend or Mailgun. Features Transactional Emails : Send emails straight from your API with template support and variable substitution SMTP : Use Plunk as an SMTP relay to send emails from any existing tool or framework Campaigns : Send newsletters and product updates to large audiences Workflows : Create advanced automations with triggers, delays, and conditional logic…
read the full Plunk overview →
About UnInbox
UnInbox The Open Source Communication Infrastructure To our Website & App » UnInbox Twitter · UnInbox Discord Server :construction: Current Status UnInbox is Live! We are working on more features and infrastructure to make UnInbox better. Please join our Discord community to get the latest updates and to provide feedback. Join at app.uninbox.com. About Our core infrastructure is designed from the ground up for effective communication between you and the rest of the world. The webapp provides a flavoured experience of what email communication would be if it was re imagined for how we communicate today. Features…
read the full UnInbox overview →
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Frequently asked questions
Is Plunk or UnInbox more popular?
Plunk has 5,573 GitHub stars and UnInbox has 1,760. 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 (5,573 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.