The most powerful & user-friendly Cal app you can find.
This app is more powerful & user-friendly than all my many other iOS calendar apps - its become very essential in my life. I also use it as my journaling app, instead of the others Ive bought designed for that purpose. If only I had a Mac version as well to sync with (instead of just BusyCal).
(NOTE: Since at least the last upgrade 9.3, it has begun failing to save everything I edit in the notes, if the text includes Apple emoticons - despite deleting & reinstalling the app, & rebooting the iPhone, with a good Internet connection.)
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Week Calendar - Smart Planner