SHSelfHostIndex

OpenSlides vs Decsync Calendar Sync

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 OpenSlides Presentation and assembly system for managing and projecting agenda, VS DE Decsync Calendar Sync File-based calendar and contacts synchronization
FeatureOpenSlidesDecsync Calendar Sync
CategoryCalendar & ContactsCalendar & Contacts
LicenseMITGPL-3.0
LanguageShellKotlin
Setup difficultyMediumMedium
Min. RAM512 MB128 MB
Deploymentdockersource, binary
GitHub stars★ 629★ 696
First released20262018
Replaces—Google Calendar

Why pick each one

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

Choose Decsync Calendar Sync if…

  • Server-free architecture
  • Privacy friendly
Decsync Calendar Sync details

Frequently asked questions

Is OpenSlides or Decsync Calendar Sync better?

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

Are OpenSlides and Decsync Calendar Sync free and open-source?

Yes. OpenSlides is licensed under MIT and Decsync Calendar Sync under GPL-3.0. Both can be self-hosted at no software cost.

Can I run OpenSlides and Decsync Calendar Sync with Docker?

OpenSlides: yes. Decsync Calendar Sync: check the project docs for container support.

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