When comparing Rainlendar vs Informant, the Slant community recommends Informant for most people. In the question“What are the best calendar apps for Mac OS X?” Informant is ranked 6th while Rainlendar is ranked 11th. The most important reason people chose Informant is:
Informant supports integration between the user's task list with their calendar.
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 Integrates tasks with calendar
Informant supports integration between the user's task list with their calendar.
Pro Seamless syncing
Informant syncs seamlessly between mobile devices and PCs, so you can create an event or task anytime on your phone and it will appear on whichever computer you are using. One license includes all devices.
Pro Integrates notes with contacts, tasks and calendar
Cons
Con Can be unstable
The calendar crashes from time to time when entering new data.
Con Price
It’s too expensive.