What personal finance apps work between iPhone, iPad and Mac?
I used Mint.com for quite awhile and liked it. It easily pairs with most bank accounts (except ones with 2-step authentication, like I have enabled which caused me to move away from it), so most transactions are populated automatically, and even categorized automatically.

Manually adding transactions is quick, and very simple. As you can see in one of the screenshots, all one has to do is open the app, and then top the "Compose" icon in the lower right corner. This opens an interface which is very intuitive.

I don't remember right off whether it allows hierarchical categories, and recurring payments, as those are not areas I specifically used, but I do know it has excellent customization of categories, and handles bills well. 

They have a Mac app which is functional, but the online interface is probably better overall. Mint has native iPhone and iPad apps, which have the ability to lock with a passcode if so desired.