When comparing Rainlendar vs Calendar 366 II, the Slant community recommends Calendar 366 II for most people. In the question“What are the best calendar apps for Mac OS X?” Calendar 366 II is ranked 9th while Rainlendar is ranked 11th.
Specs
Ranked in these QuestionsQuestion Ranking
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 Multiple views & themes
Pro It sits in your menu bar and you can activate with a hotkey
Pro It syncs well across platforms
Cons
Con Can be unstable
The calendar crashes from time to time when entering new data.
Con Too expensive
Does not replace a full Calendar app.
Con Can't see a full calendar
You are only able to see and use a snapshot instead of being able to see and use a full scale calendar.