The top five calendar apps for Mac are Apple Calendar, BusyCal, Fantastical, Microsoft Outlook, and Calendar 366 II. Each app has its own unique features and pricing models, but they all share a focus on providing a clean, native macOS interface, quick event addition, easy scheduling views, and syncing capabilities with other devices and services. The best calendar app for Mac depends on individual needs and preferences, with Apple Calendar being a great option for those who already use Apple products, BusyCal offering flexibility and customization options, Fantastical providing a beautiful and intuitive design, Microsoft Outlook packing all of Microsoft's integrations and power, and Calendar 366 II offering a great menu bar icon and full-featured functionality.