head to head · open source
claude-seo vs Billion Mail
claude-seo has 17,090 GitHub stars, 2,504 forks, 19 open issues and last shipped 7 days ago. Billion Mail has 15,611 stars, 1,702 forks, 236 open issues and last shipped 3 months ago. claude-seo leads on adoption by 9% (17,090 vs 15,611 stars). claude-seo is written in Python under MIT; Billion Mail is written in Go under AGPL-3.0. claude-seo has attracted 15% as many forks as stars, Billion Mail 11%. claude-seo 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
| claude-seo | Billion Mail | |
|---|---|---|
| GitHub stars | ★ 17K | ★ 16K |
| License | MIT | AGPL-3.0 |
| Written in | Python | Go |
| Last push | 2026-09-11 | 2026-06-11 |
| Forks | ⑂ 2.5K | ⑂ 1.7K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick claude-seo if
- You weight community size — 17K stars and counting
- You want the MIT license terms
- Your stack matches Python
- 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 claude-seo
Claude SEO is an open source SEO analysis skill for Claude Code that runs 25 sub skills and 18 specialist agents in parallel across technical SEO, E E A T content quality, Schema.org markup, AI search optimization, local SEO, and reporting, built for SEO agencies, in house SEO leads, and freelance consultants who need repeatable, testable audits rather than one off tool output.
read the full claude-seo overview →
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 →
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Frequently asked questions
Is claude-seo or Billion Mail more popular?
claude-seo has 17,090 GitHub stars and Billion Mail has 15,611. claude-seo has the larger community by that measure.
Are claude-seo and Billion Mail free?
Both are open source. claude-seo is licensed under MIT and Billion Mail under AGPL-3.0. Neither carries a licence fee.
What is the difference between claude-seo and Billion Mail?
claude-seo is written in Python 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, claude-seo or Billion Mail?
Choose claude-seo if you want the larger community (17,090 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.