CardDAV is an open protocol used to store, access, and synchronize contact information across multiple devices and applications.
It allows users to keep a single contact list on a server and automatically synchronize changes between smartphones, computers, tablets, email clients, and address book applications.
CardDAV is commonly used alongside email and calendar services to provide centralized contact management.
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How CardDAV Works
CardDAV uses a client-server model.
A CardDAV-compatible application connects to a CardDAV server, authenticates using the user’s credentials, and synchronizes contact data stored on the server.
When a contact is added, edited, or deleted on one device, the changes can be synchronized to other connected devices.
Contact information is typically stored using the vCard format, a widely adopted standard for exchanging contact data.
What Can Be Synchronized?
CardDAV can synchronize information such as:
- Names
- Email addresses
- Phone numbers
- Company information
- Physical addresses
- Notes
- Contact groups
The exact data available depends on the client application and server implementation.
Common Uses of CardDAV
CardDAV is frequently used to:
- Synchronize contacts between smartphones and computers
- Maintain a centralized address book
- Share contacts across multiple devices
- Integrate contacts with email and productivity applications
Many email platforms and groupware solutions support CardDAV alongside calendar synchronization protocols.
CardDAV vs. CalDAV
CardDAV ≠ CalDAV
CardDAV is used to synchronize contact information.
CalDAV is used to synchronize calendar events and schedules.
Although they are often used together, they serve different purposes.
| Protocol | Purpose |
|---|---|
| CardDAV | Contact synchronization |
| CalDAV | Calendar synchronization |
Benefits of Using CardDAV
Centralized Contact Management
All contact information is stored in a single location and synchronized automatically.
Multi-Device Support
Users can access the same contact list from multiple devices and applications.
Open Standard
Because CardDAV is an open protocol, it is supported by many email clients, mobile devices, and collaboration platforms.
Reduced Manual Updates
Changes made on one device can automatically appear on other connected devices.
Practical Implications
If your email provider or collaboration platform supports CardDAV, you can configure compatible applications to synchronize contacts automatically instead of maintaining separate address books on each device.
This helps prevent outdated contact information and reduces the need for manual updates.
Summary
CardDAV is an open protocol for storing and synchronizing contact information across devices and applications. By keeping contacts on a centralized server, CardDAV makes it easier to maintain a consistent and up-to-date address book on computers, smartphones, tablets, and other connected devices.