Horde Kronolith vs Tasks.org Server alt nono Calendarserver

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 Horde Kronolith with Compare Tasks.org Server alt nono Calendarserver with

HO Horde Kronolith Calendar application from the Horde groupware suite VS TA Tasks.org Server alt nono Calendarserver Archived Standards-compliant calendar and scheduling server

Feature	Horde Kronolith	Tasks.org Server alt nono Calendarserver
Deploy effort	Read-the-docs project	Read-the-docs project
Health score	69 · Good	10 · At risk
Status	Actively maintained	Archived
Category	Calendar & Contacts	Calendar & Contacts
License	GPL-2.0	Apache-2.0
Language	PHP	Python
Setup difficulty	Hard	Hard
Min. RAM	256 MB	512 MB
Deployment	bare-metal	bare-metal, source
GitHub stars	★ 10	★ 507
First released	2003	2007
Replaces	Google Calendar, Exchange	Google Calendar, Exchange

What are Horde Kronolith and Tasks.org Server alt nono Calendarserver?

Horde Kronolith

Kronolith is the calendar component of the Horde groupware framework. It provides shared calendars, event management, and supports CalDAV synchronization with desktop and mobile clients.

Part of Horde groupware
Shared calendar support
CalDAV synchronization

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

Horde Kronolith vs Tasks.org Server alt nono Calendarserver: key differences

The biggest difference is maintenance: Tasks.org Server alt nono Calendarserver's repository is archived and no longer developed, while Horde Kronolith is actively maintained. Horde Kronolith is written in PHP, while Tasks.org Server alt nono Calendarserver is built with Python. Licensing differs — GPL-2.0 for Horde Kronolith versus Apache-2.0 for Tasks.org Server alt nono Calendarserver. Horde Kronolith is the lighter option, starting around 256 MB of RAM against 512 MB for Tasks.org Server alt nono Calendarserver. Horde Kronolith is the more established project (first released 2003), while Tasks.org Server alt nono Calendarserver arrived in 2007. Tasks.org Server alt nono Calendarserver has the considerably larger community, at 507 GitHub stars versus 10.

Why pick each one

Choose Horde Kronolith if…

Released under the GPL-2.0 license
Written in PHP
Tiny footprint — runs in 256 MB RAM

Horde Kronolith details

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

Frequently asked questions

Is Horde Kronolith or Tasks.org Server alt nono Calendarserver better?

Neither is universally better. Tasks.org Server alt nono Calendarserver has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.

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

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

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

Horde Kronolith: check the project docs for container support. Tasks.org Server alt nono Calendarserver: check the project docs for container support.

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

Horde Kronolith has the smaller minimum footprint at 256 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.