When comparing Rainlendar vs Fantastical 2, the Slant community recommends Fantastical 2 for most people. In the question“What are the best calendar apps for Mac OS X?” Fantastical 2 is ranked 3rd while Rainlendar is ranked 11th. The most important reason people chose Fantastical 2 is:
Fantastical makes it really easy to add events using their superb natural language parser. For instance, an entry like "breakfast at 9am at The Diner" will be handled correctly. In addition to their best in class natural language processing, Fantastical has awesome features such as allowing users to append "/work" or "/personal" in order to add events to the specified calendar and setting up abbreviations that will add snippets of text.
Specs
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Pros
Pro Integration
Your calendar data doesn't need to be stored with your computer. Data can be retrieved from Google, RTM, and even Outlook. (With the pro version removing annoying unregistered marks)
Pro Blends in with the desktop
This calendar stays out of your way, while remaining readily available to tell you what's coming up.
The Shadow skin make it look like a wallpaper calendar, but has the benefit of being interactive.
Pro Customizable
Take control of your calendar by scripting new functionality, take skins already created, or just disable all the fluff.
Rainlendar provides a platform to present your data in the way you desire.
Pro Very polished natural language text entry
Fantastical makes it really easy to add events using their superb natural language parser. For instance, an entry like "breakfast at 9am at The Diner" will be handled correctly.
In addition to their best in class natural language processing, Fantastical has awesome features such as allowing users to append "/work" or "/personal" in order to add events to the specified calendar and setting up abbreviations that will add snippets of text.
Pro Awesome syncing support
Google, iCloud, Facebook, CalDAV, Exchanged, and iPhone calendar are all supported out of the box.
Pro "Dayticker" is a great way to quickly see appointments
Although pretty simple, the Dayticker view, located at the top of the user interface, is simply fantastic for quickly seeing which days are booked out. It also acts as a convenient way to add new events (long press on a day).
Pro Displays inline map of the event's location
The app displays inline map of the event's provided location. Additionally, users can choose between Apple's Maps or Google's Maps applications to use the feature with.
Pro Allows adding reminders
Using the natural language parser, reminders can be added with the keywords "reminder", "todo", "task", or "remind me to."
Pro Syncs with iOS reminders
Existing reminders can be used or adde with Siri.
Pro Functions as a widget
With Fantastical 2, the calendar can be accessed through a widget in order to save time.
Pro Gesture driven
Fantastical 2 lets users flick, scroll, and swipe to quickly move through different views and types of information.
Pro Custom colors
Tasks can be color coordinated in order to see their categories at a glance.
Pro Resizeable window
The divider between the two views can be dragged for customized viewing.
Cons
Con Can be unstable
The calendar crashes from time to time when entering new data.
Con Uses “dots on a day” style interface
This is not the way calendars should work.
Con V2 discontinued, V3 too expensive as a subscription model
Con Only one way to display your events
It would really help to have an actual calendar with the events written into it instead of a list and dots.