What's the best iPad app for annotating documents?

I'm looking for the easiest tool to annotate wireframes, pdfs of copy/contracts/etc using an iPad and Apple Pencil.

3 recommended

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Apple Photos

Your entire photo collection. Framed in a whole new way.

R A I Z APositivity Generator x Atlas Informatics · Written
So... this is probably a bit unorthodox for PH, but I've found that 'Markup' which is a built-in feature on iOS is the best annotator I've ever used - especially with the Pencil. I say this because I don't have to export to an app / export back to share / and is easy to get to. Simply open your PDF / wireframe and tap on the briefcase in the lower right... and that's it. $0 and pretty easy to use!
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Documents 5

A document viewer and media player.

Purchase the PDF Expert add on and this becomes the best way to handle documents on an iPad, bar none. Simply fantastic app, top recommendation.
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LiquidText 1.0

Read, annotate, and research on iPad

Annotates PDFs like no other app. Newest version is superb
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