head to head · open source
Krayin vs Billion Mail
Krayin has 24,096 GitHub stars, 1,677 forks, 121 open issues and last shipped 2 days ago. Billion Mail has 16,171 stars, 1,801 forks, 236 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; Billion Mail is written in Go under AGPL-3.0. Krayin has attracted 7% as many forks as stars, Billion Mail 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 | Billion Mail | |
|---|---|---|
| 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 Billion Mail if
- You want the Billion Mail 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 Billion Mail 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 Billion Mail
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 Billion Mail overview →
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Frequently asked questions
Is Krayin or Billion Mail more popular?
Krayin has 24,096 GitHub stars and Billion Mail has 16,171. Krayin has the larger community by that measure.
Are Krayin and Billion Mail free?
Both are open source. Krayin is licensed under MIT and Billion Mail under AGPL-3.0. Neither carries a licence fee.
What is the difference between Krayin and Billion Mail?
Krayin is written in PHP and Billion Mail 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 Billion Mail?
Choose Krayin if you want the larger community (24,096 stars) or its MIT licence terms. Choose Billion Mail if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.