When comparing Annual View vs Informant, the Slant community recommends Informant for most people. In the question“What are the best free calendar apps for Android?” Informant is ranked 9th while Annual View 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 Semester view for displaying 6 months on the same screen

Pro Aligned day number view
This new view aligns months according to days numbers.
Pro Ad-supported, full free version available
A full free version is available now.
Pro Zoom
Users can zoom in on the calendar to get a less noisy view of events.

Pro A comprehensive overview of all events in a given year
The calendar app lays out all events of a given year in a single view with months on x axis and days on y axis. The events can be identified by their color codes and assigned letters.
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 Noisy UI
With such information density and small scale of each interface element, it can be hard to get a sense of what information is presented.
Con Price
It’s too expensive.
