When comparing Rainlendar vs WeekCal, the Slant community recommends WeekCal for most people. In the question“What are the best calendar apps for Mac OS X?” WeekCal is ranked 10th while Rainlendar is ranked 11th. The most important reason people chose WeekCal is:
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.
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 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
Cons
Con Can be unstable
The calendar crashes from time to time when entering new data.
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.