khal 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 | khal | Decsync Calendar Sync |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 69 · Good | 15 · At risk |
| Category | Calendar & Contacts | Calendar & Contacts |
| License | MIT | GPL-3.0 |
| Language | Python | Kotlin |
| Setup difficulty | Medium | Medium |
| Min. RAM | 64 MB | 128 MB |
| Deployment | binary, source | source, binary |
| GitHub stars | ★ 3,054 | ★ 699 |
| First released | 2013 | 2018 |
| Replaces | Google Calendar | Google Calendar |
What are khal and Decsync Calendar Sync?
khal
khal is a standards-based command-line calendar program that reads and writes iCalendar files and works with vdirsyncer to synchronize against self-hosted CalDAV servers. It offers an interactive console interface.
- Command-line CalDAV calendar
- Works with vdirsyncer
- Interactive console interface
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
khal vs Decsync Calendar Sync: key differences
Khal is written in Python, while Decsync Calendar Sync is built with Kotlin. Licensing differs — MIT for khal versus GPL-3.0 for Decsync Calendar Sync. Khal is the lighter option, starting around 64 MB of RAM against 128 MB for Decsync Calendar Sync. Khal is the more established project (first released 2013), while Decsync Calendar Sync arrived in 2018. Khal has the considerably larger community, at 3,054 GitHub stars versus 699.
Why pick each one
Choose khal if…
- Released under the MIT license
- Active community (3.1k GitHub stars)
- Written in Python
- Tiny footprint — runs in 64 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 khal or Decsync Calendar Sync better?
Neither is universally better. khal has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are khal and Decsync Calendar Sync free and open-source?
Yes. khal is licensed under MIT and Decsync Calendar Sync under GPL-3.0. Both can be self-hosted at no software cost.
Can I run khal and Decsync Calendar Sync with Docker?
khal: check the project docs for container support. Decsync Calendar Sync: check the project docs for container support.
Which is lighter on resources, khal or Decsync Calendar Sync?
khal has the smaller minimum footprint at 64 MB of RAM, compared to about 128 MB for Decsync Calendar Sync. Real-world usage depends on library size, user count, and enabled features.