EteSync vs ETAR
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
ETAR
Open-source calendar server companion for events
| Feature | EteSync | ETAR |
|---|---|---|
| Category | Calendar & Contacts | Calendar & Contacts |
| License | AGPL-3.0 | GPL-3.0 |
| Language | Python | Java |
| Setup difficulty | Medium | Medium |
| Min. RAM | 256 MB | 256 MB |
| Deployment | docker, bare-metal | docker, source |
| GitHub stars | ★ 1,765 | ★ 2,565 |
| First released | 2017 | 2016 |
| Replaces | Google Calendar, iCloud | Google 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
Frequently asked questions
Is EteSync or ETAR better?
Neither is universally better. ETAR has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are EteSync and ETAR free and open-source?
Yes. EteSync is licensed under AGPL-3.0 and ETAR under GPL-3.0. Both can be self-hosted at no software cost.
Can I run EteSync and ETAR with Docker?
EteSync: yes. ETAR: yes.