head to head · open source
Inbox Zero vs DoubleZero
Inbox Zero has 12,238 GitHub stars, 1,536 forks, 209 open issues and last shipped yesterday. DoubleZero has 1,248 stars, 65 forks, 9 open issues and last shipped 1.9 years ago. Inbox Zero leads on adoption by 881% (12,238 vs 1,248 stars). Inbox Zero is written in TypeScript under a custom or non-standard licence; DoubleZero is written in Elixir under AGPL-3.0. Inbox Zero has attracted 13% as many forks as stars, DoubleZero 5%. 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 | DoubleZero | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 1.2K |
| License | Custom / other | AGPL-3.0 |
| Written in | TypeScript | Elixir |
| Last push | 2026-09-17 | 2024-10-22 |
| Forks | ⑂ 1.5K | ⑂ 65 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Inbox Zero if
- You weight community size — 12K 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 DoubleZero if
- You want the DoubleZero feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Elixir
- You evaluated both and DoubleZero fits your workflow better
About Inbox Zero
Inbox Zero is an open source AI email assistant written in TypeScript and placed in the email productivity ecosystem. It is a web application built with Next.js, shadcn/ui, Prisma, and related tools. The project describes itself as a 24/7 assistant that organizes email, drafts replies, manages calendar context, and handles attachments.
read the full Inbox Zero overview →
About DoubleZero
DoubleZero, also called 00, is a self hosted email dashboard for developers. It is written in Elixir, released under AGPL 3.0, and lives in the AWS Simple Email Service ecosystem. The README describes it as a dashboard for sending and monitoring emails with AWS SES.
read the full DoubleZero overview →
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Frequently asked questions
Is Inbox Zero or DoubleZero more popular?
Inbox Zero has 12,238 GitHub stars and DoubleZero has 1,248. Inbox Zero has the larger community by that measure.
Are Inbox Zero and DoubleZero free?
Both are open source. Inbox Zero has no licence declared in this registry, and DoubleZero is licensed under AGPL-3.0. Both are free to self-host.
What is the difference between Inbox Zero and DoubleZero?
Inbox Zero is written in TypeScript and DoubleZero in Elixir. 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 DoubleZero?
Choose Inbox Zero if you want the larger community (12,238 stars) or its Custom / other licence terms. Choose DoubleZero if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.