head to head · open source
Inbox Zero vs useSend
Inbox Zero has 12,895 GitHub stars, 1,653 forks, 209 open issues and last shipped yesterday. useSend has 4,775 stars, 447 forks, 37 open issues and last shipped 3 days ago. Inbox Zero leads on adoption by 170% (12,895 vs 4,775 stars). Inbox Zero is written in TypeScript under a custom or non-standard licence; useSend is written in TypeScript under AGPL-3.0. Inbox Zero has attracted 13% as many forks as stars, useSend 9%. Inbox Zero was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (email, resend), 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
| Inbox Zero | useSend | |
|---|---|---|
| GitHub stars | ★ 13K | ★ 4.8K |
| License | Custom / other | AGPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-10-31 |
| Forks | ⑂ 1.7K | ⑂ 447 |
| 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 useSend if
- You want the useSend feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and useSend 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 useSend
The Open Source sending infrastructure. Learn more » Discord . Website · Issues About this project As most of email products out there, useSend also uses Amazon SES under the hood to send emails. We provide an open and alternative way to send emails reliably and cheaply with a great dashboard. You can also use useSend manage contacts and send bulk emails(newsletter, product updates etc). We will take care of the subscriptions. Currently we only support emails, but we plan to expand to other sending protocols like SMS, push notification and even whatsapp. We are currently in beta! Features [x] Add domains [x]…
read the full useSend overview →
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Frequently asked questions
Is Inbox Zero or useSend more popular?
Inbox Zero has 12,895 GitHub stars and useSend has 4,775. Inbox Zero has the larger community by that measure.
Are Inbox Zero and useSend free?
Both are open source. Inbox Zero has no licence declared in this registry, and useSend is licensed under AGPL-3.0. Both are free to self-host.
What is the difference between Inbox Zero and useSend?
Inbox Zero is written in TypeScript and useSend in TypeScript. 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 useSend?
Choose Inbox Zero if you want the larger community (12,895 stars) or its Custom / other licence terms. Choose useSend if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.