SHSelfHostIndex

OpenCalendar Sync 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?
OP OpenCalendar Sync Self-hosted shared calendar with public event pages VS OP Open Event Server Self-hosted event management and ticketing backend
FeatureOpenCalendar SyncOpen Event Server
CategoryCalendar & ContactsCalendar & Contacts
LicenseMITGPL-3.0
LanguageTypeScriptPython
Setup difficultyMediumHard
Min. RAM256 MB1,024 MB
Deploymentdocker, sourcedocker, source
GitHub stars★ 852★ 3,006
First released20142016
ReplacesCalendly, Google CalendarEventbrite, Sched

Why pick each one

Choose OpenCalendar Sync if…

  • Released under the MIT license
  • First-class Docker support for quick deployment
  • Written in TypeScript
  • Tiny footprint — runs in 256 MB RAM
OpenCalendar Sync details

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
Open Event Server details

Frequently asked questions

Is OpenCalendar Sync or Open Event Server better?

Neither is universally better. Open Event Server has the larger community, while OpenCalendar Sync is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.

Are OpenCalendar Sync and Open Event Server free and open-source?

Yes. OpenCalendar Sync is licensed under MIT and Open Event Server under GPL-3.0. Both can be self-hosted at no software cost.

Can I run OpenCalendar Sync and Open Event Server with Docker?

OpenCalendar Sync: yes. Open Event Server: yes.

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