What Is CalDAV, and When Do You Need It?

CalDAV is a standard that lets calendar apps work with calendars stored on a server. It can support reading and changing events, provided your account has the right permissions. You are most likely to encounter it when connecting a calendar service that is not offered as a named Google, Microsoft, or Apple Account option.

The service, the account and the app

Think of the server as the place your appointments live: your account lets you in, and a calendar app is how you look at and change what is there.

For example, an organization might run a CalDAV service for its members. You could open your calendar using Calendar on Mac or another compatible app. Adding it to a second app does not move the calendar; both apps show and edit the same events on the server.

The standard describes access to calendar data over the web. Individual servers still differ in the features they offer and the rules they enforce. The CalDAV specification is the formal reference, although most users should follow their service provider's setup instructions.

What you need to connect

Your provider should supply a username, a password or app-specific credential, and the correct server address. Some apps discover the calendar automatically; others need more information.

Use the server address in your provider's current instructions. Its browser sign-in page may use a different address from its calendar service. Once connected, choose the calendar you need from the account's list, such as Personal, Family, or Projects.

Calendar on Mac supports adding calendar accounts through Calendar settings. Apple's account guide explains the account options. The fields you see depend on the service and your macOS version.

If an account is managed by work or school, check whether third-party access is permitted. A failed connection is not always a wrong password; it can be a policy or server restriction.

CalDAV is different from an ICS link

An ICS link normally gives you a read-only feed. Your app checks the feed for changes but does not send edits back through that link.

A CalDAV connection can provide authenticated access to individual calendars and may allow writes. It is useful when you need to create or update appointments on the server, rather than only follow a published schedule.

Neither name alone guarantees instant updates, collaboration, or compatibility with every app. If your sports club provides only an ICS subscription, there is no need to look for a CalDAV password. If your provider offers a writable account, publishing the entire calendar as a public feed may be an unnecessary privacy compromise.

Compare ICS subscriptions and authenticated calendar access if your provider offers both.

When your current calendar app is enough

If you simply want to manage your CalDAV appointments on a phone or computer, a compatible app may solve the problem directly. Add the account, select the calendars you want to see, and create one test appointment in the intended calendar.

Check the provider's own web calendar, if available, to confirm the appointment reached the server. Then change it from another connected device. This tells you more than seeing an account name appear in settings.

If you want several calendars together, you may only need a combined view. A separate synchronization service is not necessary just to have two accounts visible.

When Avum may help

Avum can copy time from a CalDAV calendar into a Google or Outlook work calendar, for example, so colleagues see busy blocks without access to the CalDAV account. It also connects iCloud calendars and read-only ICS sources.

Connect the account, select the source calendar, then use a Sync Rule to choose the destination and the details to copy. If a CalDAV calendar will receive copies, Avum needs write access and must complete its write verification. A read-only calendar cannot become writable by changing a sync setting.

For the first copy, use a test appointment with a generic title. Confirm its time and later changes in the destination, then delete the original and inspect the copy's removal. Continue maintaining real appointments in their original calendar.

Ready to connect more of your calendars? Start your free 30-day trial with Avum today.