What's the best iPad app for sketching interfaces?

I want to draw from scratch but also have the ability to upload screenshots and mark it up. The ideal app would have large canvas to zoom in and out of
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    Paper 3.0

    The new sticky note

    Ryan Hoover
    Ryan Hoover85Founder, Product Hunt ยท Written
    Have you tried Paper by FiftyThree? Since its initial launch, they added sketching functionality, optimal for iPads.
    Second using paper for sketching as well. You can add images and mark it up - if that's what you're looking for.