SHSelfHostIndex

OpenSlides 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?
OP OpenSlides Presentation and assembly system for managing and projecting agenda, VS ET ETAR Open-source calendar server companion for events
FeatureOpenSlidesETAR
CategoryCalendar & ContactsCalendar & Contacts
LicenseMITGPL-3.0
LanguageShellJava
Setup difficultyMediumMedium
Min. RAM512 MB256 MB
Deploymentdockerdocker, source
GitHub stars★ 629★ 2,565
First released20262016
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 ETAR if…

  • Open ecosystem
  • No vendor lock-in
ETAR details

Frequently asked questions

Is OpenSlides 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 OpenSlides and ETAR free and open-source?

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

Can I run OpenSlides and ETAR with Docker?

OpenSlides: yes. ETAR: yes.

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