Horde Kronolith vs Open Event Server
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
Open Event Server
Self-hosted event management and ticketing backend
| Feature | Horde Kronolith | Open Event Server |
|---|---|---|
| Category | Calendar & Contacts | Calendar & Contacts |
| License | GPL-2.0 | GPL-3.0 |
| Language | PHP | Python |
| Setup difficulty | Hard | Hard |
| Min. RAM | 256 MB | 1,024 MB |
| Deployment | bare-metal | docker, source |
| GitHub stars | ★ 10 | ★ 3,006 |
| First released | 2003 | 2016 |
| Replaces | Google Calendar, Exchange | Eventbrite, Sched |
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 Open Event Server if…
- Released under the GPL-3.0 license
- First-class Docker support for quick deployment
- Active community (3k GitHub stars)
- Written in Python
Frequently asked questions
Is Horde Kronolith or Open Event Server better?
Neither is universally better. Open Event Server has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are Horde Kronolith and Open Event Server free and open-source?
Yes. Horde Kronolith is licensed under GPL-2.0 and Open Event Server under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Horde Kronolith and Open Event Server with Docker?
Horde Kronolith: check the project docs for container support. Open Event Server: yes.