SHSelfHostIndex

Calcom Calendar vs Zimbra Collaboration

A side-by-side comparison of two self-hosted groupware options — licensing, setup difficulty, resource needs, and what each one replaces.

Not the right match-up?
CA Calcom Calendar Open-source scheduling and appointment booking platform VS ZI Zimbra Collaboration Email, calendar, collaboration server with Web interface and lots of
FeatureCalcom CalendarZimbra Collaboration
CategoryGroupwareGroupware
LicenseAGPL-3.0GPL-2.0
LanguageTypeScriptJava
Setup difficultyMediumMedium
Min. RAM1,024 MB512 MB
Deploymentdocker, bare-metal, sourcebare-metal
GitHub stars★ 47,334—
First released20212020
ReplacesCalendly, Doodle—

Why pick each one

Choose Calcom Calendar if…

  • Polished modern UX
  • Rich integrations
Calcom Calendar details

Choose Zimbra Collaboration if…

  • Released under the GPL-2.0 license
  • Written in Java
  • Lightweight — runs in 512 MB RAM
Zimbra Collaboration details

Frequently asked questions

Is Calcom Calendar or Zimbra Collaboration better?

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

Are Calcom Calendar and Zimbra Collaboration free and open-source?

Yes. Calcom Calendar is licensed under AGPL-3.0 and Zimbra Collaboration under GPL-2.0. Both can be self-hosted at no software cost.

Can I run Calcom Calendar and Zimbra Collaboration with Docker?

Calcom Calendar: yes. Zimbra Collaboration: check the project docs for container support.

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