head to head · open source
claude-seo vs mailtrain
claude-seo has 25,931 GitHub stars, 3,395 forks, 19 open issues and last shipped 2 days ago. mailtrain has 5,754 stars, 706 forks, 116 open issues and last shipped 1.1 years ago. claude-seo leads on adoption by 351% (25,931 vs 5,754 stars). claude-seo is written in Python under MIT; mailtrain is written in JavaScript under GPL-3.0. claude-seo has attracted 13% as many forks as stars, mailtrain 12%. claude-seo was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (marketing-automation), so they are genuine substitutes rather than adjacent tools.
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 | mailtrain | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 5.8K |
| License | MIT | GPL-3.0 |
| Written in | Python | JavaScript |
| Last push | 2026-11-01 | 2025-10-05 |
| Forks | ⑂ 3.4K | ⑂ 706 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick claude-seo if
- You weight community size — 26K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick mailtrain if
- You want the mailtrain feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches JavaScript
- You evaluated both and mailtrain fits your workflow better
About claude-seo
Claude SEO: SEO Skill for Claude Code Claude SEO is an open source SEO analysis plugin for Claude Code. It runs 25 sub skills and 18 specialist agents in parallel across technical SEO, content quality (E E A T), Schema.org markup, AI search optimization (GEO), local SEO, e commerce, and international SEO. Every audit produces a prioritized action plan with testable recommendations grounded in primary source guidance from Google. Two versions of this skill. 🌐 Public open source → AgriciDaniel/claude seo : MIT, public releases, no membership. Use this if you want stable + downloadable. 🔒 Community private mirror…
read the full claude-seo overview →
About mailtrain
Mailtrain v2 Mailtrain is a self hosted newsletter application built on Node.js (v14+) and MySQL (v8+) or MariaDB (v10+). This is version 2 of Mailtrain. It mostly implements all features of v1 and add some more. It is a complete rewrite, so you will have to install it from scratch. If you are upgrading from Mailtrain v1, backup the DB and use it for Mailtrain v2. Mailtrain v2 should be able to upgrade the DB to the new schema. Features Subscriber lists management List segmentation Custom fields Email templates (including MJML based templates) Custom reports Automation (triggered and RSS campaigns) Multiple…
read the full mailtrain overview →
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Frequently asked questions
Is claude-seo or mailtrain more popular?
claude-seo has 25,931 GitHub stars and mailtrain has 5,754. claude-seo has the larger community by that measure.
Are claude-seo and mailtrain free?
Both are open source. claude-seo is licensed under MIT and mailtrain under GPL-3.0. Neither carries a licence fee.
What is the difference between claude-seo and mailtrain?
claude-seo is written in Python and mailtrain in JavaScript. 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 mailtrain?
Choose claude-seo if you want the larger community (25,931 stars) or its MIT licence terms. Choose mailtrain if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.