📅 Calendar Open source Privacy ★★★★★
Radicale
Minimal CalDAV server
Overview
Radicale offers calendar and contact sync only—simpler than full Nextcloud when that is all you need.
File-based .ics/.vcf storage simplifies backup; deploy with systemd, Docker, or nginx reverse proxy.
Ideal for homelab users avoiding heavy groupware stacks.
Scores
Privacy 5/5
Ease of use 2/5
Features 2/5
Value 5/5
Google Calendar — comparison
Removes Google cloud calendar dependency; CalDAV clients connect freely—no built-in Meet equivalent.
Pros
- ✓ Minimal CalDAV/CardDAV deployment
- ✓ Easy file-based backups
- ✓ Simple Docker/systemd install
- ✓ Fully open source
Cons & caveats
- − No web UI—CalDAV client required
- − Limited advanced sharing features
- − Not for large teams
Best for
- Minimal self-hosted setup
- Personal and household use
- Lighter alternative to Nextcloud
Not ideal for
- Web-only calendar management
- Enterprise shared calendar needs
Specs
- Pricing
- Self-hosted — Free OSS; server cost only (Raspberry Pi viable).
- Difficulty
- Advanced
- Data location
- Your self-hosted server.
- Platforms
- Self-hosted · CalDAV clients
軽量・シンプルCalDAV/CardDAVPython製OSS
Migration from Google Calendar
- 1 Install Radicale on server
- 2 Export Google Calendar .ics
- 3 Place or import .ics into Radicale storage
- 4 Configure CalDAV URLs on clients
Setup steps
- 1 Install via pip or Docker
- 2 Configure users and permissions in config file
- 3 Import Google .ics calendars
- 4 Add CalDAV account on iOS/macOS/DAVx5