EteSync vs Open Event Server
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
Open Event Server
Self-hosted event management and ticketing backend
| Feature | EteSync | Open Event Server |
|---|---|---|
| Category | Calendar & Contacts | Calendar & Contacts |
| License | AGPL-3.0 | GPL-3.0 |
| Language | Python | Python |
| Setup difficulty | Medium | Hard |
| Min. RAM | 256 MB | 1,024 MB |
| Deployment | docker, bare-metal | docker, source |
| GitHub stars | ★ 1,765 | ★ 3,006 |
| First released | 2017 | 2016 |
| Replaces | Google Calendar, iCloud | Eventbrite, Sched |
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 Open Event Server if…
- Released under the GPL-3.0 license
- First-class Docker support for quick deployment
- Active community (3k GitHub stars)
- Written in Python
Frequently asked questions
Is EteSync or Open Event Server better?
Neither is universally better. Open Event Server has the larger community, while EteSync is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are EteSync and Open Event Server free and open-source?
Yes. EteSync is licensed under AGPL-3.0 and Open Event Server under GPL-3.0. Both can be self-hosted at no software cost.
Can I run EteSync and Open Event Server with Docker?
EteSync: yes. Open Event Server: yes.