head to head · open source
Krayin vs BillionMail
Krayin has 24,096 GitHub stars, 1,677 forks, 121 open issues and last shipped 2 days ago. BillionMail has 16,171 stars, 1,801 forks, 239 open issues and last shipped 5 months ago. Krayin leads on adoption by 49% (24,096 vs 16,171 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 | 2026-11-01 | 2026-06-11 |
| Forks | ⑂ 1.7K | ⑂ 1.8K |
| 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
Topics 1. Introduction 2. Documentation 3. Requirements 4. Installation & Configuration 4. Docker Installation 5. Krayin Cloud System 6. License 7. Security Vulnerabilities Introduction Krayin CRM is a hand tailored CRM framework built on some of the hottest opensource technologies such as Laravel (a PHP framework) and Vue.js a progressive Javascript framework. Free & Opensource Laravel CRM solution for SMEs and Enterprises for complete customer lifecycle management. Read our documentation: Krayin CRM Docs We also have a forum for any type of concerns, feature requests, or discussions. Please visit: Krayin CRM…
read the full Krayin overview →
About BillionMail
BillionMail 📧 An Open Source MailServer, NewsLetter, Email Marketing Solution for Smarter Campaigns [![][license shield]][license link] [![][docs shield]][docs link] [![][github release shield]][github release link] [![][github stars shield]][github stars link] English 简体中文 日本語 Türkçe What is BillionMail? BillionMail is a future open source Mail server, Email marketing platform designed to help businesses and individuals manage their email campaigns with ease. Whether you're sending newsletters, promotional emails, or transactional messages, this tool will provide full control over your email marketing efforts…
read the full BillionMail overview →
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Frequently asked questions
Is Krayin or BillionMail more popular?
Krayin has 24,096 GitHub stars and BillionMail has 16,171. 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 (24,096 stars) or its MIT licence terms. Choose BillionMail if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.