head to head · open source
Billion Mail vs growth-lab
Billion Mail has 16,185 GitHub stars, 1,803 forks, 236 open issues and last shipped 5 months ago. growth-lab has 1,972 stars, 169 forks, 0 open issues and last shipped 1 months ago. Billion Mail leads on adoption by 721% (16,185 vs 1,972 stars). Billion Mail is written in Go under AGPL-3.0; growth-lab is written in Python under Apache-2.0. Billion Mail has attracted 11% as many forks as stars, growth-lab 9%. growth-lab 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 | growth-lab | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 2.0K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Go | Python |
| Last push | 2026-06-11 | 2026-09-28 |
| Forks | ⑂ 1.8K | ⑂ 169 |
| 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 growth-lab if
- You want the growth-lab feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and growth-lab fits your workflow better
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 →
About growth-lab
🧪 Growth Lab 用自然语言运行产品运营和用户增长闭环：理解产品，发现真实需求，采取行动，再从结果中找到下一步。 官网 简体中文 · English · 繁體中文 · Français · Español · Русский · Português · Deutsch · 日本語 · 한국어 · Türkçe · Tiếng Việt · Polski 为什么做 Growth Lab 大多数 AI 增长工具只解决一个局部问题：有的生成文案，有的研究竞品，有的负责发布，有的展示数据。产品上下文在不同工具之间反复丢失，真正重要的决策仍散落在仪表盘、文档、Prompt 和人工交接中。 增长是一个持续学习的闭环： 现代 Coding Agent 已经能够读取代码仓库、搜索网络、操作工具、编辑文件、跨上下文推理，并在会话中与人协作。Growth Lab 以 Codex 和 Claude Code 作为应用 Runtime，将这些能力组织成端到端的增长工作流。 产品模型 Skill 教 Runtime 如何理解产品、开展研究、选择工具、形成策略、制作内容、分析反馈和决定下一步。Client 工具让 Runtime 能够使用浏览器、官方 API、数据导出、内容平台和素材生成等外部能力。文件跨会话保存产品上下文、研究资料、决策与结果。 AI 会话负责控制整个工作流程。 每个 Model 都是一个“观察—行动—复盘”闭环。每个…
read the full growth-lab overview →
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Frequently asked questions
Is Billion Mail or growth-lab more popular?
Billion Mail has 16,185 GitHub stars and growth-lab has 1,972. Billion Mail has the larger community by that measure.
Are Billion Mail and growth-lab free?
Both are open source. Billion Mail is licensed under AGPL-3.0 and growth-lab under Apache-2.0. Neither carries a licence fee.
What is the difference between Billion Mail and growth-lab?
Billion Mail is written in Go and growth-lab in Python. 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 growth-lab?
Choose Billion Mail if you want the larger community (16,185 stars) or its AGPL-3.0 licence terms. Choose growth-lab if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.