Is there a "windirstat"/"Disk Inventory X" type iOS app? (ie app for visualizing hard drive usage on iOS) This is a pretty simple question. Assuming you know what WinDirStat &amp;/or Disc Inventory X do, which is visualize the usage of your hard drive on a file-by-file basis, sized in proportion to the size of the given file(s) &amp; colorized according to type.

For someone it might be a new app idea. I'm hoping it already exists, however. I know a program like this wouldn't (need to) tell you the "path" to any files, but it would be nice to visualize which apps are hogging the most of the 16GB hard drive on my iPhone.

I'm aware of iTunes's simple Apps/Music/Video/Etc pie chart but am looking for something a bit more "WinDirStat/Disk Inventory X"-like.
Your only option is to make a backup of the iOS device on a Mac/PC, then use a third party tool to copy the files into the filesystem as regular files.

From there you can run Disk Inventory X or any similar tool.

Beware that iOS uses compression and doesn't necessarily store all of your files on the local device (photos and music in particular could be in the cloud), so this will not give you an accurate measurement. But it will be as close as you can get.