SHSelfHostIndex

KOrganizer 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?
KO KOrganizer Calendar and scheduling component of KDE Kontact VS ET ETAR Open-source calendar server companion for events
FeatureKOrganizerETAR
CategoryCalendar & ContactsCalendar & Contacts
LicenseGPL-2.0GPL-3.0
LanguageC++Java
Setup difficultyMediumMedium
Min. RAM512 MB256 MB
Deploymentbinary, sourcedocker, source
GitHub stars★ 100★ 2,565
First released20002016
ReplacesOutlook CalendarGoogle Calendar

Why pick each one

Choose KOrganizer if…

  • Released under the GPL-2.0 license
  • Written in C++
  • Lightweight — runs in 512 MB RAM
KOrganizer details

Choose ETAR if…

  • Open ecosystem
  • No vendor lock-in
ETAR details

Frequently asked questions

Is KOrganizer 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 KOrganizer and ETAR free and open-source?

Yes. KOrganizer is licensed under GPL-2.0 and ETAR under GPL-3.0. Both can be self-hosted at no software cost.

Can I run KOrganizer and ETAR with Docker?

KOrganizer: check the project docs for container support. ETAR: yes.

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