Claper vs OpenSlides
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?
Claper
The ultimate tool to interact with your audience (alternative to
VS
OpenSlides
Presentation and assembly system for managing and projecting agenda,
| Feature | Claper | OpenSlides |
|---|---|---|
| Category | Calendar & Contacts | Calendar & Contacts |
| License | GPL-3.0 | MIT |
| Language | Elixir | Shell |
| Setup difficulty | Medium | Medium |
| Min. RAM | 512 MB | 512 MB |
| Deployment | docker | docker |
| GitHub stars | ★ 773 | ★ 629 |
| First released | 2026 | 2026 |
| Replaces | — | — |
Why pick each one
Choose Claper if…
- Released under the GPL-3.0 license
- First-class Docker support for quick deployment
- Written in Elixir
- Lightweight — runs in 512 MB RAM
Choose OpenSlides if…
- Released under the MIT license
- First-class Docker support for quick deployment
- Written in Shell
- Lightweight — runs in 512 MB RAM
Frequently asked questions
Is Claper or OpenSlides better?
Neither is universally better. Claper has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Claper and OpenSlides free and open-source?
Yes. Claper is licensed under GPL-3.0 and OpenSlides under MIT. Both can be self-hosted at no software cost.
Can I run Claper and OpenSlides with Docker?
Claper: yes. OpenSlides: yes.