Calendar and Contact Sync Tools
Discover free, open-source, and secure ways to sync your contacts and calendars across your devices.
Nextcloud is a suite of client-server software for creating and using file hosting services. This includes calendar sync via CalDAV and contacts sync via CardDAV. Nextcloud is free and open-source, thereby allowing anyone to install and operate it without charge on a private server.
EteSync is a secure, end-to-end encrypted, and privacy-respecting cloud backup and synchronization software for your personal information (e.g. contacts and calendars). There are native clients for Android, iOS, and the web, and an adapter layer for most desktop clients. It costs $24 per year to use, or you can host the server yourself for free.
- fruux - A unified contacts/calendaring system that works across platforms and devices.
- Cloud backups - Consider regularly exporting your calendar and or contacts and backing them up on a separate storage drive or uploading them to cloud storage (ideally after encrypting them).
- DecSync - DecSync can be used to synchronize RSS, contacts, and calendars without a server by using file synchronization software such as Syncthing.