Claper vs Decsync Calendar Sync
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
Decsync Calendar Sync
File-based calendar and contacts synchronization
| Feature | Claper | Decsync Calendar Sync |
|---|---|---|
| Category | Calendar & Contacts | Calendar & Contacts |
| License | GPL-3.0 | GPL-3.0 |
| Language | Elixir | Kotlin |
| Setup difficulty | Medium | Medium |
| Min. RAM | 512 MB | 128 MB |
| Deployment | docker | source, binary |
| GitHub stars | ★ 773 | ★ 696 |
| First released | 2026 | 2018 |
| Replaces | — | Google Calendar |
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 Decsync Calendar Sync if…
- Server-free architecture
- Privacy friendly
Frequently asked questions
Is Claper or Decsync Calendar Sync 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 Decsync Calendar Sync free and open-source?
Yes. Claper is licensed under GPL-3.0 and Decsync Calendar Sync under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Claper and Decsync Calendar Sync with Docker?
Claper: yes. Decsync Calendar Sync: check the project docs for container support.