Cozy vs Mail-in-a-Box
A side-by-side comparison of two self-hosted apps from related categories — licensing, setup difficulty, resource needs, and what each one replaces.
Not the right match-up?
Cozy
Personal cloud platform with contacts and calendar
VS
Mail-in-a-Box
Turn a fresh server into a working mail server
| Feature | Cozy | Mail-in-a-Box |
|---|---|---|
| Category | Groupware | Mail Servers |
| License | AGPL-3.0 | CC0-1.0 |
| Language | Go | Python |
| Setup difficulty | Hard | Easy |
| Min. RAM | 1,024 MB | 1,024 MB |
| Deployment | docker, source | bare-metal, one-click |
| GitHub stars | ★ 1,272 | ★ 15,385 |
| First released | 2016 | 2014 |
| Replaces | Google Workspace | Google Workspace, Microsoft 365 |
Why pick each one
Choose Cozy if…
- Released under the AGPL-3.0 license
- First-class Docker support for quick deployment
- Active community (1.3k GitHub stars)
- Written in Go
Frequently asked questions
Is Cozy or Mail-in-a-Box better?
Mail-in-a-Box is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Cozy if its specific feature set fits your needs better.
Are Cozy and Mail-in-a-Box free and open-source?
Yes. Cozy is licensed under AGPL-3.0 and Mail-in-a-Box under CC0-1.0. Both can be self-hosted at no software cost.
Can I run Cozy and Mail-in-a-Box with Docker?
Cozy: yes. Mail-in-a-Box: check the project docs for container support.