Finally available on the App Store
itunes.apple.com/app/id743974925?mt=8

The Review Mode allows you to markup PDF documents in a very special way. Just tap anywhere on the text where you need changes and correct it in the text editor. The text that you delete is marked as removed while everything you add is shown as new text in different colors.

All your modifications are standard PDF annotations that do not affect text in the PDF itself, which is very important.

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