A lot of the capabilities of the desktop app are lost here, like anything beyond plain formatting. Also iCloud sync is super glitchy/wont even sync my library. I have found a way around this by air dropping cards to my phone which is not ideal but works. This also keeps formatting from your computer although some symbols are lost.
The gestures also make no sense I dont see why the same Mac trackpad gestures arent kept for the iPhone app, it makes it a lot less intuitive to use.
I also wish you could lock the view horizontally
This is unfortunate for a paid app.
Jessicoz about Mental Case — Flashcards for the Serious Student