Decsync Calendar Sync 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 Decsync Calendar Sync with Compare Tasks.org Server alt nono Calendarserver with

DE Decsync Calendar Sync File-based calendar and contacts synchronization VS TA Tasks.org Server alt nono Calendarserver Archived Standards-compliant calendar and scheduling server

Feature	Decsync Calendar Sync	Tasks.org Server alt nono Calendarserver
Deploy effort	Read-the-docs project	Read-the-docs project
Health score	15 · At risk	10 · At risk
Status	Actively maintained	Archived
Category	Calendar & Contacts	Calendar & Contacts
License	GPL-3.0	Apache-2.0
Language	Kotlin	Python
Setup difficulty	Medium	Hard
Min. RAM	128 MB	512 MB
Deployment	source, binary	bare-metal, source
GitHub stars	★ 699	★ 507
First released	2018	2007
Replaces	Google Calendar	Google Calendar, Exchange

What are Decsync Calendar Sync and Tasks.org Server alt nono Calendarserver?

Decsync Calendar Sync

Decsync is a method and toolset for synchronizing calendars and contacts via a shared folder rather than a central server. Self-hosters pair it with a file-sync service to keep events consistent across devices.

Folder-based sync
No central server
Calendar and contacts
Pairs with any file sync

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

Decsync Calendar Sync 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 Decsync Calendar Sync is actively maintained. Decsync Calendar Sync is written in Kotlin, while Tasks.org Server alt nono Calendarserver is built with Python. Licensing differs — GPL-3.0 for Decsync Calendar Sync versus Apache-2.0 for Tasks.org Server alt nono Calendarserver. Decsync Calendar Sync is the lighter option, starting around 128 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 Decsync Calendar Sync arrived in 2018.

Why pick each one

Choose Decsync Calendar Sync if…

Server-free architecture
Privacy friendly

Watch out for

Requires a sync layer
Setup is non-trivial

Decsync Calendar Sync 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 Decsync Calendar Sync or Tasks.org Server alt nono Calendarserver better?

Decsync Calendar Sync 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 Decsync Calendar Sync and Tasks.org Server alt nono Calendarserver free and open-source?

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

Can I run Decsync Calendar Sync and Tasks.org Server alt nono Calendarserver with Docker?

Decsync Calendar Sync: 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, Decsync Calendar Sync or Tasks.org Server alt nono Calendarserver?

Decsync Calendar Sync has the smaller minimum footprint at 128 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.