Calendar/Contacts Sync Tools

Discover free, open source, and secure ways to sync your contacts and calendars across your devices.

Calendar and Contacts Sync

Nextcloud

Nextcloud 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.

Website: nextcloud.com

Client OS: Windows, macOS, Linux, BSD, Unix, iOS, Android, Fire OS. Server: Linux.

Email Providers

Email Providers Many email providers also offer calendar and or contacts sync services. Refer to the Email Providers section to choose an email provider and check if they also offer calendar and or contacts sync.

Website: Email Providers section

OS: depends on email provider.

EteSync

EteSync EteSync is a secure, end-to-end encrypted and journaled personal information (e.g. contacts and calendar) cloud synchronization and backup for Android and any OS that supports CalDAV/CardDAV. It costs $14 per year to use, or you can host the server yourself for free.

Website: etesync.com

Client OS: Android, Web. Server OS: Linux.

Worth Mentioning