head to head · open source
claude-seo vs BillionMail
claude-seo has 17,090 GitHub stars, 2,504 forks, 19 open issues and last shipped 7 days ago. BillionMail has 15,611 stars, 1,702 forks, 239 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; BillionMail is written in Go under AGPL-3.0. claude-seo has attracted 15% as many forks as stars, BillionMail 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 | BillionMail | |
|---|---|---|
| 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 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 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 BillionMail
BillionMail is an open source mail server, newsletter, and email marketing platform that runs entirely on infrastructure the operator controls. It is written in Go and released under the AGPL 3.0 license, and it lives in the self hosted email and marketing ecosystem alongside the mail transfer and delivery components it bundles, including Postfix, Dovecot, and Rspamd. The project ships as a complete stack rather than a single binary, combining a sending server, a campaign manager, and a webmail client so that one deployment covers transactional mail, promotional campaigns, and newsletters.
read the full BillionMail overview →
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Frequently asked questions
Is claude-seo or BillionMail more popular?
claude-seo has 17,090 GitHub stars and BillionMail has 15,611. claude-seo has the larger community by that measure.
Are claude-seo and BillionMail free?
Both are open source. claude-seo is licensed under MIT and BillionMail under AGPL-3.0. Neither carries a licence fee.
What is the difference between claude-seo and BillionMail?
claude-seo is written in Python 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, claude-seo or BillionMail?
Choose claude-seo if you want the larger community (17,090 stars) or its MIT licence terms. Choose BillionMail if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.