GNOME Calendar vs Decsync Calendar Sync
A side-by-side comparison of two self-hosted calendar & contacts options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | GNOME Calendar | Decsync Calendar Sync |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Category | Calendar & Contacts | Calendar & Contacts |
| License | GPL-3.0 | GPL-3.0 |
| Language | C | Kotlin |
| Setup difficulty | Easy | Medium |
| Min. RAM | 256 MB | 128 MB |
| Deployment | binary, source | source, binary |
| GitHub stars | ★ 300 | ★ 699 |
| First released | 2015 | 2018 |
| Replaces | Google Calendar | Google Calendar |
What are GNOME Calendar and Decsync Calendar Sync?
GNOME Calendar
GNOME Calendar is a clean and uncluttered desktop calendar application that integrates with GNOME Online Accounts and can connect to self-hosted CalDAV servers for synchronizing events.
- Clean desktop calendar
- CalDAV server support
- GNOME Online Accounts integration
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
GNOME Calendar vs Decsync Calendar Sync: key differences
GNOME Calendar is written in C, while Decsync Calendar Sync is built with Kotlin. Decsync Calendar Sync is the lighter option, starting around 128 MB of RAM against 256 MB for GNOME Calendar. GNOME Calendar is the more established project (first released 2015), while Decsync Calendar Sync arrived in 2018. Decsync Calendar Sync has the considerably larger community, at 699 GitHub stars versus 300.
Why pick each one
Choose GNOME Calendar if…
- Released under the GPL-3.0 license
- Easy to set up — beginner-friendly
- Written in C
- Tiny footprint — runs in 256 MB RAM
Choose Decsync Calendar Sync if…
- Server-free architecture
- Privacy friendly
Watch out for
- Requires a sync layer
- Setup is non-trivial
Frequently asked questions
Is GNOME Calendar or Decsync Calendar Sync better?
Neither is universally better. Decsync Calendar Sync has the larger community, while GNOME Calendar is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are GNOME Calendar and Decsync Calendar Sync free and open-source?
Yes. GNOME Calendar is licensed under GPL-3.0 and Decsync Calendar Sync under GPL-3.0. Both can be self-hosted at no software cost.
Can I run GNOME Calendar and Decsync Calendar Sync with Docker?
GNOME Calendar: check the project docs for container support. Decsync Calendar Sync: check the project docs for container support.
Which is lighter on resources, GNOME Calendar or Decsync Calendar Sync?
Decsync Calendar Sync has the smaller minimum footprint at 128 MB of RAM, compared to about 256 MB for GNOME Calendar. Real-world usage depends on library size, user count, and enabled features.