Fantastical is a premium calendar and task management app for Apple devices known for its beautiful design, natural language event creation, and powerful task integration. Developed by Flexibits since 2011, Fantastical's natural language parsing — type "lunch with Sarah next Tuesday at noon at Nobu" and it creates the event, location, and invitee automatically — remains the best in any calendar app. Its Tasks feature integrates with Reminders and supports subtasks, due dates, and lists, making it a capable combined calendar and task system for users who prefer to manage tasks in the context of their schedule.

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Fantastical on Wikipedia

https://flexibits.com/fantastical