Horde Kronolith vs vdirsyncer
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?
Horde Kronolith
Calendar application from the Horde groupware suite
VS
vdirsyncer
Synchronize calendars and contacts via CalDAV/CardDAV
| Feature | Horde Kronolith | vdirsyncer |
|---|---|---|
| Category | Calendar & Contacts | Calendar & Contacts |
| License | GPL-2.0 | BSD-3-Clause |
| Language | PHP | Python |
| Setup difficulty | Hard | Medium |
| Min. RAM | 256 MB | 64 MB |
| Deployment | bare-metal | binary, source |
| GitHub stars | ★ 10 | ★ 1,859 |
| First released | 2003 | 2014 |
| Replaces | Google Calendar, Exchange | iCloud sync |
Why pick each one
Choose Horde Kronolith if…
- Released under the GPL-2.0 license
- Written in PHP
- Tiny footprint — runs in 256 MB RAM
Choose vdirsyncer if…
- Released under the BSD-3-Clause license
- Active community (1.9k GitHub stars)
- Written in Python
- Tiny footprint — runs in 64 MB RAM
Frequently asked questions
Is Horde Kronolith or vdirsyncer better?
vdirsyncer is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Horde Kronolith if its specific feature set fits your needs better.
Are Horde Kronolith and vdirsyncer free and open-source?
Yes. Horde Kronolith is licensed under GPL-2.0 and vdirsyncer under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run Horde Kronolith and vdirsyncer with Docker?
Horde Kronolith: check the project docs for container support. vdirsyncer: check the project docs for container support.