SHSelfHostIndex

OpenCalendar Sync vs OpenSlides

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 OpenSlides Presentation and assembly system for managing and projecting agenda,
FeatureOpenCalendar SyncOpenSlides
CategoryCalendar & ContactsCalendar & Contacts
LicenseMITMIT
LanguageTypeScriptShell
Setup difficultyMediumMedium
Min. RAM256 MB512 MB
Deploymentdocker, sourcedocker
GitHub stars★ 852★ 629
First released20142026
ReplacesCalendly, Google Calendar—

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 OpenSlides if…

  • Released under the MIT license
  • First-class Docker support for quick deployment
  • Written in Shell
  • Lightweight — runs in 512 MB RAM
OpenSlides details

Frequently asked questions

Is OpenCalendar Sync or OpenSlides better?

Neither is universally better. OpenCalendar Sync has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.

Are OpenCalendar Sync and OpenSlides free and open-source?

Yes. OpenCalendar Sync is licensed under MIT and OpenSlides under MIT. Both can be self-hosted at no software cost.

Can I run OpenCalendar Sync and OpenSlides with Docker?

OpenCalendar Sync: yes. OpenSlides: yes.

Related comparisons