EteSync vs khal
A side-by-side comparison of two self-hosted calendar & contacts options — licensing, setup difficulty, resource needs, and what each one replaces.
EteSync
End-to-end encrypted sync for contacts and calendars
VS
khal
Command-line calendar built on CalDAV
| Feature | EteSync | khal |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 20 · At risk | 69 · Good |
| Category | Calendar & Contacts | Calendar & Contacts |
| License | AGPL-3.0 | MIT |
| Language | Python | Python |
| Setup difficulty | Medium | Medium |
| Min. RAM | 256 MB | 64 MB |
| Deployment | docker, bare-metal | binary, source |
| GitHub stars | ★ 1,770 | ★ 3,054 |
| First released | 2017 | 2013 |
| Replaces | Google Calendar, iCloud | Google Calendar |
What are EteSync and khal?
EteSync
EteSync is a secure, end-to-end encrypted, and journaled solution for syncing contacts, calendars, and tasks. Data is encrypted on the client so the server never sees plaintext.
- End-to-end encryption
- Journaled change history
- Android and iOS apps
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
EteSync vs khal: key differences
Both projects are written in Python. Licensing differs — AGPL-3.0 for EteSync versus MIT for khal. Khal is the lighter option, starting around 64 MB of RAM against 256 MB for EteSync. Khal is the more established project (first released 2013), while EteSync arrived in 2017. EteSync lists first-class Docker deployment; khal does not.
Why pick each one
Choose EteSync if…
- Released under the AGPL-3.0 license
- First-class Docker support for quick deployment
- Active community (1.8k GitHub stars)
- Written in Python
Choose khal if…
- Released under the MIT license
- Active community (3.1k GitHub stars)
- Written in Python
- Tiny footprint — runs in 64 MB RAM
Frequently asked questions
Is EteSync or khal 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 EteSync and khal free and open-source?
Yes. EteSync is licensed under AGPL-3.0 and khal under MIT. Both can be self-hosted at no software cost.
Can I run EteSync and khal with Docker?
EteSync: yes. khal: check the project docs for container support.
Which is lighter on resources, EteSync or khal?
khal has the smaller minimum footprint at 64 MB of RAM, compared to about 256 MB for EteSync. Real-world usage depends on library size, user count, and enabled features.