head to head · open source
Krayin vs BillionMail
Krayin has 23,890 GitHub stars, 1,630 forks, 121 open issues and last shipped 4 days ago. BillionMail has 15,611 stars, 1,702 forks, 239 open issues and last shipped 3 months ago. Krayin leads on adoption by 53% (23,890 vs 15,611 stars). Krayin is written in PHP under MIT; BillionMail is written in Go under AGPL-3.0. Krayin has attracted 7% as many forks as stars, BillionMail 11%. Krayin 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
| Krayin | BillionMail | |
|---|---|---|
| GitHub stars | ★ 24K | ★ 16K |
| License | MIT | AGPL-3.0 |
| Written in | PHP | Go |
| Last push | 2026-09-14 | 2026-06-11 |
| Forks | ⑂ 1.6K | ⑂ 1.7K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Krayin if
- You weight community size — 24K stars and counting
- You want the MIT license terms
- Your stack matches PHP
- You value the larger contributor base for long-term maintenance
pick BillionMail if
- You want the BillionMail feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Go
- You evaluated both and BillionMail fits your workflow better
About Krayin
Krayin is a free, MIT licensed, self hosted customer relationship management framework built on Laravel and Vue.js, intended for small and medium businesses and enterprises that want to run customer, lead, and sales management on their own infrastructure.
read the full Krayin overview →
About BillionMail
BillionMail is an open source mail server, newsletter, and email marketing platform that runs entirely on infrastructure the operator controls. It is written in Go and released under the AGPL 3.0 license, and it lives in the self hosted email and marketing ecosystem alongside the mail transfer and delivery components it bundles, including Postfix, Dovecot, and Rspamd. The project ships as a complete stack rather than a single binary, combining a sending server, a campaign manager, and a webmail client so that one deployment covers transactional mail, promotional campaigns, and newsletters.
read the full BillionMail overview →
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Frequently asked questions
Is Krayin or BillionMail more popular?
Krayin has 23,890 GitHub stars and BillionMail has 15,611. Krayin has the larger community by that measure.
Are Krayin and BillionMail free?
Both are open source. Krayin is licensed under MIT and BillionMail under AGPL-3.0. Neither carries a licence fee.
What is the difference between Krayin and BillionMail?
Krayin is written in PHP and BillionMail in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Krayin or BillionMail?
Choose Krayin if you want the larger community (23,890 stars) or its MIT licence terms. Choose BillionMail if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.