Group-Office vs Calcom Calendar
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?
Group-Office
Web-based groupware and CRM with email and calendar
VS
Calcom Calendar
Open-source scheduling and appointment booking platform
| Feature | Group-Office | Calcom Calendar |
|---|---|---|
| Category | Groupware | Groupware |
| License | AGPL-3.0 | AGPL-3.0 |
| Language | PHP | TypeScript |
| Setup difficulty | Medium | Medium |
| Min. RAM | 1,024 MB | 1,024 MB |
| Deployment | docker, bare-metal | docker, bare-metal, source |
| GitHub stars | ★ 275 | ★ 47,334 |
| First released | 2003 | 2021 |
| Replaces | Microsoft 365, Google Workspace | Calendly, Doodle |
Why pick each one
Choose Group-Office if…
- Released under the AGPL-3.0 license
- First-class Docker support for quick deployment
- Written in PHP
Frequently asked questions
Is Group-Office or Calcom Calendar better?
Neither is universally better. Calcom Calendar has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Group-Office and Calcom Calendar free and open-source?
Yes. Group-Office is licensed under AGPL-3.0 and Calcom Calendar under AGPL-3.0. Both can be self-hosted at no software cost.
Can I run Group-Office and Calcom Calendar with Docker?
Group-Office: yes. Calcom Calendar: yes.