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

1 recommended

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Paper 3.0

The new sticky note

Ryan Hoover44Founder, Product Hunt · Written
Have you tried Paper by FiftyThree? Since its initial launch, they added sketching functionality, optimal for iPads.
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Second using paper for sketching as well. You can add images and mark it up - if that's what you're looking for.
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