iPhone default calendar app

iOS doesn't offer a way to make any other calendar app the default.

See -> https://apps.apple.com/us/app/fantastical-calendar/id718043190

Is a Free app with Offers In-App Purchases.

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Try fantastical for free

• Beautiful, clean, and easy to use calendar app allowing you to manage basic events

• The DayTicker and calendar makes your schedule look the nicest it ever has

• Full screen day, week, month, quarter, and year views

• Full task support including Todoist and Google Tasks

• 3 day weather forecast (powered by AccuWeather)

• 14 day free trial for Flexibits Premium

Upgrade to flexibits premium for even more (requires subscription).