calcurse vs EteSync
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
| Feature | calcurse | EteSync |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 77 · Good | 20 · At risk |
| Category | Calendar & Contacts | Calendar & Contacts |
| License | BSD-2-Clause | AGPL-3.0 |
| Language | C | Python |
| Setup difficulty | Easy | Medium |
| Min. RAM | 16 MB | 256 MB |
| Deployment | binary, source | docker, bare-metal |
| GitHub stars | ★ 1,301 | ★ 1,770 |
| First released | 2004 | 2017 |
| Replaces | Google Calendar | Google Calendar, iCloud |
What are calcurse and EteSync?
calcurse
calcurse is a text-based personal organizer with a calendar, an appointments list, and a to-do manager, all in a curses interface. It supports CalDAV synchronization so it can connect to self-hosted calendar servers.
- Text-based calendar and to-do
- CalDAV synchronization
- Very low resource use
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
calcurse vs EteSync: key differences
Calcurse is written in C, while EteSync is built with Python. Licensing differs — BSD-2-Clause for calcurse versus AGPL-3.0 for EteSync. Calcurse is the lighter option, starting around 16 MB of RAM against 256 MB for EteSync. Calcurse is the more established project (first released 2004), while EteSync arrived in 2017. EteSync lists first-class Docker deployment; calcurse does not.
Why pick each one
Choose calcurse if…
- Released under the BSD-2-Clause license
- Easy to set up — beginner-friendly
- Active community (1.3k GitHub stars)
- Written in C
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
Frequently asked questions
Is calcurse or EteSync better?
Neither is universally better. EteSync has the larger community, while calcurse is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are calcurse and EteSync free and open-source?
Yes. calcurse is licensed under BSD-2-Clause and EteSync under AGPL-3.0. Both can be self-hosted at no software cost.
Can I run calcurse and EteSync with Docker?
calcurse: check the project docs for container support. EteSync: yes.
Which is lighter on resources, calcurse or EteSync?
calcurse has the smaller minimum footprint at 16 MB of RAM, compared to about 256 MB for EteSync. Real-world usage depends on library size, user count, and enabled features.