Can I sync with iCloud Calendar?

Yes. Calendar Op.2 shares its data with the built-in iOS Calendar, so anything synced through iCloud appears automatically — there’s nothing to set up inside Calendar Op.2 itself.

To make sure iCloud Calendar sync is on:

1. Open Settings and tap your name at the top.
2. Tap iCloud, then make sure Calendars is turned on.

Once enabled, your events sync across every device signed in to the same Apple Account, and they’ll show up in Calendar Op.2 right away.

For more detail, see Apple’s guide: Set up iCloud on all your devices.