Text to speech (TTS) apps seem like a dime a dozen these days, so finding a quality one that is worth downloading (or buying in this case) is nothing to scoff at.
Voice Dream Reader, available for iOS 5.1 and above, supports twelve different file formats (including PDF, Microsoft Word and Apple Pages) as well as eleven different content sources (including Evernote, Dropbox and Google Drive). Voice Dream comes with Heather, a female English voice, and is compatible with the pre-existing voices on iOS 7. Users are also able to purchase extra voices for between $1.99 and $4.99.
A few key features that Voice Dream offers include an adjustable reading speed (between 50-500 words per minute), a sleep timer, note taking capabilities, the ability to remember where the user left off and the ability to continue playing when users leave the app or lock the screen.
Voice Dream is $9.99 to purchase, however, there is a lite version available that stops reading after 200-300 characters.