EteSync vs KOrganizer
A side-by-side comparison of two self-hosted calendar & contacts options — licensing, setup difficulty, resource needs, and what each one replaces.
Not the right match-up?
EteSync
End-to-end encrypted sync for contacts and calendars
VS
KOrganizer
Calendar and scheduling component of KDE Kontact
| Feature | EteSync | KOrganizer |
|---|---|---|
| Category | Calendar & Contacts | Calendar & Contacts |
| License | AGPL-3.0 | GPL-2.0 |
| Language | Python | C++ |
| Setup difficulty | Medium | Medium |
| Min. RAM | 256 MB | 512 MB |
| Deployment | docker, bare-metal | binary, source |
| GitHub stars | ★ 1,765 | ★ 100 |
| First released | 2017 | 2000 |
| Replaces | Google Calendar, iCloud | Outlook Calendar |
Why pick each one
Choose EteSync if…
- Released under the AGPL-3.0 license
- First-class Docker support for quick deployment
- Active community (1.8k GitHub stars)
- Written in Python
Choose KOrganizer if…
- Released under the GPL-2.0 license
- Written in C++
- Lightweight — runs in 512 MB RAM
Frequently asked questions
Is EteSync or KOrganizer better?
Neither is universally better. EteSync has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are EteSync and KOrganizer free and open-source?
Yes. EteSync is licensed under AGPL-3.0 and KOrganizer under GPL-2.0. Both can be self-hosted at no software cost.
Can I run EteSync and KOrganizer with Docker?
EteSync: yes. KOrganizer: check the project docs for container support.