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.
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3 recommended
  1. 2
    Apple Photos

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

    R A I Z A
    R A I Z A🍝 Product Manager | Spaghetti Aficionado · 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!
  2. 1
    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.
  3. 1
    LiquidText 1.0

    Read, annotate, and research on iPad

    Annotates PDFs like no other app. Newest version is superb