Calcom Calendar vs Horde Groupware
A side-by-side comparison of two self-hosted groupware options — licensing, setup difficulty, resource needs, and what each one replaces.
Not the right match-up?
Calcom Calendar
Open-source scheduling and appointment booking platform
VS
Horde Groupware
PHP groupware suite with webmail and calendaring
| Feature | Calcom Calendar | Horde Groupware |
|---|---|---|
| Category | Groupware | Groupware |
| License | AGPL-3.0 | GPL-2.0 |
| Language | TypeScript | PHP |
| Setup difficulty | Medium | Hard |
| Min. RAM | 1,024 MB | 512 MB |
| Deployment | docker, bare-metal, source | bare-metal, source |
| GitHub stars | ★ 47,334 | ★ 243 |
| First released | 2021 | 2003 |
| Replaces | Calendly, Doodle | Microsoft Exchange |
Why pick each one
Choose Horde Groupware if…
- Released under the GPL-2.0 license
- Written in PHP
- Lightweight — runs in 512 MB RAM
Frequently asked questions
Is Calcom Calendar or Horde Groupware better?
Calcom Calendar is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Horde Groupware if its specific feature set fits your needs better.
Are Calcom Calendar and Horde Groupware free and open-source?
Yes. Calcom Calendar is licensed under AGPL-3.0 and Horde Groupware under GPL-2.0. Both can be self-hosted at no software cost.
Can I run Calcom Calendar and Horde Groupware with Docker?
Calcom Calendar: yes. Horde Groupware: check the project docs for container support.