SHSelfHostIndex

OpenCalendar Sync vs DavMail

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 DA DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to
FeatureOpenCalendar SyncDavMail
CategoryCalendar & ContactsCalendar & Contacts
LicenseMITGPL-2.0
LanguageTypeScriptJava
Setup difficultyMediumMedium
Min. RAM256 MB512 MB
Deploymentdocker, sourcebare-metal
GitHub stars★ 852★ 751
First released20142020
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 DavMail if…

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

Frequently asked questions

Is OpenCalendar Sync or DavMail 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 DavMail free and open-source?

Yes. OpenCalendar Sync is licensed under MIT and DavMail under GPL-2.0. Both can be self-hosted at no software cost.

Can I run OpenCalendar Sync and DavMail with Docker?

OpenCalendar Sync: yes. DavMail: check the project docs for container support.

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