Simple todo-list for iOS (iPad) with tags and subtasks?

Question

iOS

Please recommend a simple todo list app for iPad.
Necessarily needed: the ability to assign tags to tasks and make a selection based on them; the ability to make subtasks at least one level of nesting (in the most extreme case, the ability to write a text note for the task is suitable); manual sorting by drag and drop.
Synchronization with any online service is not needed. Moreover, if the application is tightly tied to the online and stores tasks on the side, it will not work.
Dates for tasks, calendar, notifications, uploads, printing, and more. - all this is pleasant, but not very important. A good guide to what I want is mytinytodo.net (there's a demo that doesn't require registration), with subtasks only, and as an iOS app that doesn't require a network.
Thank you.

Answer 1

Here is a good comparison chart.

Answer 2

Catch notes (free, synced but works offline) and Things ($20, no sync)