Why you might want a different default calendar

Your iPhone comes with Apple Calendar pre-installed, but you can change which calendar app opens when you tap a date or accept an invitation. This matters for security and privacy because different calendar apps handle your data differently — some store events only on your device, others sync to company servers, and some require you to log in through a third-party account.

If you use Google Calendar for work, Outlook for family coordination, or a privacy-focused app like Proton Calendar, setting it as your default means you control where your schedule lives and who can see it. You avoid accidentally creating events in the wrong place or logging into multiple apps just to check your calendar.

Key Takeaways

  • You can only change your default calendar app on iPhone running iOS 17 or later — earlier versions do not have this setting.
  • The default calendar setting lives in Settings > Apps > Default Apps > Calendar, and you must choose from apps already installed on your phone.
  • Changing the default does not delete Apple Calendar or move your existing events — it only changes which app opens when you tap dates or respond to invitations.
  • Some calendar apps (like Google Calendar or Outlook) require you to sign in before you can set them as default, and you must complete the sign-in process inside the app itself.
  • Your default calendar choice is separate from which calendar you use for reminders, which has its own setting in the Reminders app.

Check your iPhone version first

The ability to change your default calendar app only exists on iOS 17 and later. If you have an older iPhone, this setting is not available to you, and Apple Calendar will remain your default no matter what you do.

To check your iOS version, open Settings, tap General, then tap About. Look for the "Software Version" line. If it shows 17.0 or higher, you can proceed. If it shows 16 or lower, you would need to update your iPhone first — go to Settings > General > Software Update to see if an update is available for your device.

Install and sign into the calendar app you want

Before you can set a different calendar as default, it must be installed on your iPhone and you must be signed in. read the app from the App Store if you do not have it yet — search for the app by name (Google Calendar, Outlook, Proton Calendar, or whichever you prefer).

Once installed, open the app and sign in with your account. For Google Calendar, you will sign in with your Google account. For Outlook, use your Microsoft account. For Proton Calendar, use your Proton account. Do not skip this step — the app will not appear in your default calendar options until you have signed in at least once.

Change the default in Settings

Open the Settings app on your iPhone. Tap Apps, then scroll down and tap Default Apps. Look for the Calendar option — it will show your current default (usually Apple Calendar if you have not changed it yet).

Tap Calendar. You will see a list of all calendar apps installed on your phone that you have signed into. Tap the one you want to use as your default. The change takes effect when ready — you do not need to restart your phone.

What happens after you change the default

When you tap a date in Mail, Messages, or Safari, your new default calendar app will open instead of Apple Calendar. When you receive a calendar invitation in Mail or Messages, tapping "Accept" will add the event to your default calendar app. Siri will also create new events in your default calendar when you ask it to schedule something.

Your existing events in Apple Calendar do not disappear or move — they stay in Apple Calendar. You can still open Apple Calendar anytime and see all your old events there. Changing the default just controls which app handles new events and invitations going forward.

Switching back to Apple Calendar or changing again

If you change your mind, go back to Settings > Apps > Default Apps > Calendar and tap Apple Calendar. You can switch between different calendar apps as many times as you want — there is no limit to how often you change your default.

Some people use multiple calendar apps at once: they might keep Apple Calendar as default for personal events but open Google Calendar separately for work. This works fine, but it means you have to manually choose which app to open depending on what you are doing. If you find yourself doing this often, it might be worth setting your most-used calendar as the default instead.

Troubleshooting: app does not appear in the list

If the calendar app you want does not show up in your default calendar options, it is usually because you have not signed in yet. Open the app, complete the sign-in process with your account, and then go back to Settings > Apps > Default Apps > Calendar. The app should now appear in the list.

If the app still does not appear, check that it is actually a calendar app — some apps that include calendar features (like Gmail or Outlook for email) may not register as calendar apps for this setting. Try opening the app and looking for a calendar or scheduling section to confirm it is designed to manage your calendar.

Frequently Asked Questions

Does changing my default calendar move my existing events?

No. Your events stay in whichever app they were created in. Changing the default only controls where new events go. If you created events in Apple Calendar before switching to Google Calendar as your default, those Apple Calendar events remain in Apple Calendar.

Can I set a different default for work versus personal events?

Not automatically — you can only have one default calendar app at a time. However, many calendar apps (like Google Calendar and Outlook) let you create multiple calendars within the same app and color-code them by purpose, which gives you similar organization without switching defaults.

What if my workplace requires me to use a specific calendar app?

Set that app as your default. If your company uses Microsoft Exchange or Office 365, Outlook is usually the best choice. If they use Google Workspace, Google Calendar works best. Your IT department can tell you which app they support if you are unsure.

Will my calendar sync across my devices if I change the default?

That depends on the app, not on whether it is your default. Google Calendar syncs across all your devices automatically. Apple Calendar syncs through iCloud. Outlook syncs through Microsoft accounts. The default setting only affects your iPhone — it does not change how syncing works on your Mac, iPad, or other devices.

Can I use multiple calendar apps at the same time?

Yes. You can have Google Calendar, Outlook, and Apple Calendar all installed and signed in. Only one can be your default, but you can open any of them anytime. Some people do this to keep work and personal calendars separate, though it means managing multiple apps.