head to head · open source
Billion Mail vs growth-lab
Billion Mail has 15,619 GitHub stars, 1,704 forks, 236 open issues and last shipped 3 months ago. growth-lab has 1,988 stars, 170 forks, 0 open issues and last shipped 1 months ago. Billion Mail leads on adoption by 686% (15,619 vs 1,988 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 | 2026-08-11 |
| Forks | ⑂ 1.7K | ⑂ 170 |
| 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 is an open source mail server and email marketing platform written in Go and released under the AGPL 3.0 license. It lives in the self hosted email ecosystem and is described as a solution for newsletters, promotional emails, and transactional messages. The project combines mail server topics such as Postfix, Dovecot, Rspamd, and SMTP with campaign features such as customer management, analytics, templates, and sending control.
read the full Billion Mail overview →
About growth-lab
Growth Lab is an open source Python growth tool in the business software and marketing customer engagement ecosystem. It understands a product, fetches needed data, researches the market, executes campaign actions, and reviews results to improve the next growth round. It runs inside Codex or Claude Code as the application runtime.
read the full growth-lab overview →
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Frequently asked questions
Is Billion Mail or growth-lab more popular?
Billion Mail has 15,619 GitHub stars and growth-lab has 1,988. 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 (15,619 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.