When comparing Fantastical vs SmartDay, the Slant community recommends SmartDay for most people. In the question“What are the best calendar apps for Mac OS X?” SmartDay is ranked 7th while Fantastical is ranked 15th. The most important reason people chose SmartDay is:
The app doubles as a task manager and allows dragging and dropping tasks into the calendar on specific days. If a task does not get completed on that day, it automatically gets rescheduled.
Specs
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Pros
Pro Supports multiple calendar platforms
If you're locked into using an Exchange account, Google Calendar won't work without 3rd party syncing options. Fantastical works flawlessly with Exchange and with Google Accounts so you can have both. It also supports iCloud, Office365, Yahoo, and Facebook calendars.
Pro Fantastical can comprehend natural language
You can copy and paste a line from a meeting note and Fantastical can copy down and present the relevant information
Pro Beautiful and highly polished design
Pro Integrates task-management with the calendar
The app doubles as a task manager and allows dragging and dropping tasks into the calendar on specific days. If a task does not get completed on that day, it automatically gets rescheduled.
Pro Aims to provide a complete organizational solution
The app includes a way to manage tasks, take notes, set reminders and manage project from within the calendar.
Pro Calendars can be shared
Cons
Con Expensive for a single utility app
Fantastical on OS X costs $49.99 and an additional $4.99 if you want to use it on iOS.
Con Only supports iOS and OSX
Fantastical doesn't support web, Windows or Android.
Con it's not free
not as pricey as others, but still not free.
Con Doesn't integrate
Does not support Google Calendar integration.
Con Support is limited
The app support is confusing and hard to navigate.
Con Lacks natural language input
Natural language input allows creating events in the same way if you had to tell it to a friend. Writing something like "Lunch at 2pm" would add an event called "Lunch" at 2 PM. SmartDay lacks that functionality.