Calcom Calendar vs Kolab 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
Kolab Groupware
Open-source groupware server with mail and calendaring
| Feature | Calcom Calendar | Kolab Groupware |
|---|---|---|
| Category | Groupware | Groupware |
| License | AGPL-3.0 | AGPL-3.0 |
| Language | TypeScript | PHP |
| Setup difficulty | Medium | Hard |
| Min. RAM | 1,024 MB | 2,048 MB |
| Deployment | docker, bare-metal, source | bare-metal, docker |
| GitHub stars | ★ 47,334 | ★ 200 |
| First released | 2021 | 2002 |
| Replaces | Calendly, Doodle | Microsoft Exchange, Zimbra |
Why pick each one
Choose Kolab Groupware if…
- Built on proven components
- Strong standards support
Frequently asked questions
Is Calcom Calendar or Kolab Groupware better?
Calcom Calendar is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Kolab Groupware if its specific feature set fits your needs better.
Are Calcom Calendar and Kolab Groupware free and open-source?
Yes. Calcom Calendar is licensed under AGPL-3.0 and Kolab Groupware under AGPL-3.0. Both can be self-hosted at no software cost.
Can I run Calcom Calendar and Kolab Groupware with Docker?
Calcom Calendar: yes. Kolab Groupware: yes.