head to head · open source
Inbox Zero vs Sendportal
Inbox Zero has 12,895 GitHub stars, 1,653 forks, 209 open issues and last shipped yesterday. Sendportal has 2,188 stars, 475 forks, 52 open issues and last shipped 12 days ago. Inbox Zero leads on adoption by 489% (12,895 vs 2,188 stars). Inbox Zero is written in TypeScript under a custom or non-standard licence; Sendportal is written in PHP under MIT. Inbox Zero has attracted 13% as many forks as stars, Sendportal 22%. Inbox Zero 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
| Inbox Zero | Sendportal | |
|---|---|---|
| GitHub stars | ★ 13K | ★ 2.2K |
| License | Custom / other | MIT |
| Written in | TypeScript | PHP |
| Last push | 2026-11-02 | 2026-10-22 |
| Forks | ⑂ 1.7K | ⑂ 475 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Inbox Zero if
- You weight community size — 13K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Sendportal if
- You want the Sendportal feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches PHP
- You evaluated both and Sendportal fits your workflow better
About Inbox Zero
Inbox Zero your 24/7 AI email assistant Organizes your inbox, pre drafts replies, manages your calendar, and organizes attachments. Chat with it from Slack or Telegram to manage your inbox on the go. Open source alternative to Fyxer, but more customizable and secure. Website · Discord · Issues Mission To help you spend less time in your inbox, so you can focus on what matters most. Features AI Personal Assistant: Organizes your inbox and pre drafts replies in your tone and style. AI Rules for email: Explain in plain English how your AI should handle your inbox. Reply Zero: Track emails to reply to and those…
read the full Inbox Zero overview →
About Sendportal
Modern open source self hosted email marketing. Website Documentation Introduction The core functionality of SendPortal is contained within the SendPortal Core package. If you would like to add SendPortal to an existing application that already handles user authentication, you only require SendPortal Core. Features SendPortal includes subscriber and list management, email campaigns, message tracking, reports and multiple workspaces/domains in a modern, flexible and scalable application. SendPortal integrates with Amazon SES, Postmark, Sendgrid, Mailgun and Mailjet. The SendPortal application acts as a wrapper…
read the full Sendportal overview →
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Frequently asked questions
Is Inbox Zero or Sendportal more popular?
Inbox Zero has 12,895 GitHub stars and Sendportal has 2,188. Inbox Zero has the larger community by that measure.
Are Inbox Zero and Sendportal free?
Both are open source. Inbox Zero has no licence declared in this registry, and Sendportal is licensed under MIT. Both are free to self-host.
What is the difference between Inbox Zero and Sendportal?
Inbox Zero is written in TypeScript and Sendportal in PHP. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Inbox Zero or Sendportal?
Choose Inbox Zero if you want the larger community (12,895 stars) or its Custom / other licence terms. Choose Sendportal if its feature set, stack or MIT licence fits better. Both are self-hostable.