When comparing WeekCal vs Calendar, the Slant community recommends Calendar for most people. In the question“What are the best calendar apps for Mac OS X?” Calendar is ranked 2nd while WeekCal is ranked 10th.
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Pros
Pro Templates
Week Calendar includes templates, which are files containing one or more events that can be duplicated from week to week. With each event, information such as address, time, or duration can be copied as well. This comes in handy for routine events like work, school, or exercise.
Pro Dropbox attachments
Week Calendar supports dropbox file attachments in collaborative calendars so other people are able to quickly see files relating to an event.
Pro Action menu
With the action menu, users can use up to 40 kinds of automated actions.
Pro Easy to move events
Just like with apps on the home screen, events on Week Cal can be moved with a tap and hold gesture.
Pro Quickly see relevant info
Week Calendar displays a day's events just by tapping the date. The data can be tapped directly from year view.
Pro Custom color
Best thing is being able to set different colors, if you have multiple events during the day it really helps to set different colors to easily get an overview for school lessons as an example.
Pro TextExpander support
Pro Dense week view
Pro GNOME native integration
Pro Currently in active development
GNOME Calendar is improved with every release cycle of GNOME.
Pro Simplicity
Calendar for GNOME aims to find the perfect balance between features and usability.
Pro Synchronisation
It has online accounts integration.
Cons
Con New PRO subscription
Pro subscription needed to get same functionality that existed for previously paid customers.
Con Issues with repeating events
When making templates, multiple repeating events can't be duplicated from within the same file.
Con Cannot print
Con Extremely buggy
Con Poor interoperability with online calendars
Does not connect to Fastmail.
Con Far too simple
Con FAR too tied into the GNOME infrastructure
The UI and configuration presume you are running GNOME, and has the ugliness of a GNOME application. Configuration, as is usual for any GNOME application, is pretty much nonesistent.
Con Can't read 'all-day' events with dark theme
Text is white on light blue with dark themes. The workaround: assign all-day events to just one hour.
Con Can't import ics files
Con Continues to pop-up reminders that are turned off and they cannot ever be removed
The GNOME Calendar displays pop-ups from an old Google Calendar that was used. That Google Calendar has long since been removed from GNOME, and even with the notifications turned off on the GNOME Calendar, the pop-ups still happen.
Con Incorrect appointment times when importing .ics calendars
Con No support yet for WebCal
No support yet for WebCal, such as those offered by Facebook events.
A workaround exists. Since this application uses the same background services as Evolution, installing it and adding the WebCal calendars there, also adds them to GNOME Calendar.