Tasks.org Server alt nono Calendarserver vs Xandikos

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? Compare Tasks.org Server alt nono Calendarserver with Compare Xandikos with

TA Tasks.org Server alt nono Calendarserver Archived Standards-compliant calendar and scheduling server VS XA Xandikos Git-backed CalDAV and CardDAV server

Feature	Tasks.org Server alt nono Calendarserver	Xandikos
Deploy effort	Read-the-docs project	Under-an-hour setup
Health score	10 · At risk	80 · Excellent
Status	Archived	Actively maintained
Category	Calendar & Contacts	Calendar & Contacts
License	Apache-2.0	GPL-3.0
Language	Python	Python
Setup difficulty	Hard	Medium
Min. RAM	512 MB	64 MB
Deployment	bare-metal, source	docker, binary
GitHub stars	★ 507	★ 606
First released	2007	2016
Replaces	Google Calendar, Exchange	Google Calendar, iCloud

What are Tasks.org Server alt nono Calendarserver and Xandikos?

Tasks.org Server alt nono Calendarserver

Calendar and Contacts Server is a CalDAV and CardDAV server originally developed by Apple. It provides shared calendaring, scheduling, and directory services for groups.

Originated at Apple
Group scheduling support
Standards-compliant CalDAV

Xandikos

Xandikos is a lightweight CalDAV and CardDAV server that stores all data in a Git repository. This gives version history for every calendar and contact change with minimal infrastructure.

Git-backed storage with history
No database required
Lightweight footprint

Tasks.org Server alt nono Calendarserver vs Xandikos: key differences

The biggest difference is maintenance: Tasks.org Server alt nono Calendarserver's repository is archived and no longer developed, while Xandikos is actively maintained. Both projects are written in Python. Licensing differs — Apache-2.0 for Tasks.org Server alt nono Calendarserver versus GPL-3.0 for Xandikos. Xandikos is the lighter option, starting around 64 MB of RAM against 512 MB for Tasks.org Server alt nono Calendarserver. Tasks.org Server alt nono Calendarserver is the more established project (first released 2007), while Xandikos arrived in 2016. Xandikos lists first-class Docker deployment; Tasks.org Server alt nono Calendarserver does not.

Why pick each one

Choose Tasks.org Server alt nono Calendarserver if…

Released under the Apache-2.0 license
Written in Python
Lightweight — runs in 512 MB RAM

Tasks.org Server alt nono Calendarserver details

Choose Xandikos if…

Released under the GPL-3.0 license
First-class Docker support for quick deployment
Written in Python
Tiny footprint — runs in 64 MB RAM

Xandikos details

Frequently asked questions

Is Tasks.org Server alt nono Calendarserver or Xandikos better?

Xandikos is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Tasks.org Server alt nono Calendarserver if its specific feature set fits your needs better.

Are Tasks.org Server alt nono Calendarserver and Xandikos free and open-source?

Yes. Tasks.org Server alt nono Calendarserver is licensed under Apache-2.0 and Xandikos under GPL-3.0. Both can be self-hosted at no software cost.

Can I run Tasks.org Server alt nono Calendarserver and Xandikos with Docker?

Tasks.org Server alt nono Calendarserver: check the project docs for container support. Xandikos: yes.

Which is lighter on resources, Tasks.org Server alt nono Calendarserver or Xandikos?

Xandikos has the smaller minimum footprint at 64 MB of RAM, compared to about 512 MB for Tasks.org Server alt nono Calendarserver. Real-world usage depends on library size, user count, and enabled features.