Designing for iPhone Duo

A design skill, not an implementation one. For APIs, see the sibling skills.

Closed, iPhone Duo is compact, familiar and pocketable. Open, it is the largest canvas ever on an iPhone. It gets held and set down in many ways: partially folded like a book, seated on a table like a laptop with the inner display facing the user, or standing on its edges.

The governing principle

One app that adapts — not several designs stitched together.

Users open and close this device constantly, often mid-task. If the hierarchy or the available functions change between inside and outside, they have to re-orient every time. So: