head to head · open source
Billion Mail vs Kutt
Billion Mail has 15,611 GitHub stars, 1,702 forks, 236 open issues and last shipped 3 months ago. Kutt has 11,107 stars, 1,511 forks, 80 open issues and last shipped 15 days ago. Billion Mail leads on adoption by 41% (15,611 vs 11,107 stars). Billion Mail is written in Go under AGPL-3.0; Kutt is written in JavaScript under MIT. Billion Mail has attracted 11% as many forks as stars, Kutt 14%. Kutt 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
| Billion Mail | Kutt | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 11K |
| License | AGPL-3.0 | MIT |
| Written in | Go | JavaScript |
| Last push | 2026-06-11 | 2026-09-03 |
| Forks | ⑂ 1.7K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Billion Mail if
- You weight community size — 16K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick Kutt if
- You want the Kutt feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and Kutt fits your workflow better
About Billion Mail
BillionMail is an open source mail server and email marketing platform written in Go and released under the AGPL 3.0 license. It lives in the self hosted email ecosystem and is described as a solution for newsletters, promotional emails, and transactional messages. The project combines mail server topics such as Postfix, Dovecot, Rspamd, and SMTP with campaign features such as customer management, analytics, templates, and sending control.
read the full Billion Mail overview →
About Kutt
Kutt is a free, MIT licensed, self hosted URL shortener written in JavaScript for individuals, teams, and organisations that want branded short links on their own infrastructure rather than a rented hosted service.
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Frequently asked questions
Is Billion Mail or Kutt more popular?
Billion Mail has 15,611 GitHub stars and Kutt has 11,107. Billion Mail has the larger community by that measure.
Are Billion Mail and Kutt free?
Both are open source. Billion Mail is licensed under AGPL-3.0 and Kutt under MIT. Neither carries a licence fee.
What is the difference between Billion Mail and Kutt?
Billion Mail is written in Go and Kutt in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Billion Mail or Kutt?
Choose Billion Mail if you want the larger community (15,611 stars) or its AGPL-3.0 licence terms. Choose Kutt if its feature set, stack or MIT licence fits better. Both are self-hostable.