head to head · open source
Krayin vs mailtrain
Krayin has 23,890 GitHub stars, 1,630 forks, 121 open issues and last shipped 4 days ago. mailtrain has 5,751 stars, 707 forks, 116 open issues and last shipped 12 months ago. Krayin leads on adoption by 315% (23,890 vs 5,751 stars). Krayin is written in PHP under MIT; mailtrain is written in JavaScript under GPL-3.0. Krayin has attracted 7% as many forks as stars, mailtrain 12%. 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 | mailtrain | |
|---|---|---|
| GitHub stars | ★ 24K | ★ 5.8K |
| License | MIT | GPL-3.0 |
| Written in | PHP | JavaScript |
| Last push | 2026-09-14 | 2025-10-05 |
| Forks | ⑂ 1.6K | ⑂ 707 |
| 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 mailtrain if
- You want the mailtrain feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches JavaScript
- You evaluated both and mailtrain 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 mailtrain
Mailtrain is a self hosted newsletter application built on Node.js (v14 or later) with MySQL (v8 or later) or MariaDB (v10 or later) as the data store. Version 2 is a complete rewrite that mostly implements all features of version 1 while adding more, so it must be installed from scratch; existing v1 databases can be backed up and reused, as Mailtrain v2 is able to upgrade the schema. The project lives in the JavaScript ecosystem and is distributed under the GPL 3.0 license, with roughly 5,752 stars, 708 forks and 116 open issues on its repository, which has been active for about ten years with the last push in O…
read the full mailtrain overview →
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Frequently asked questions
Is Krayin or mailtrain more popular?
Krayin has 23,890 GitHub stars and mailtrain has 5,751. Krayin has the larger community by that measure.
Are Krayin and mailtrain free?
Both are open source. Krayin is licensed under MIT and mailtrain under GPL-3.0. Neither carries a licence fee.
What is the difference between Krayin and mailtrain?
Krayin is written in PHP and mailtrain 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, Krayin or mailtrain?
Choose Krayin if you want the larger community (23,890 stars) or its MIT licence terms. Choose mailtrain if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.