This seems obvious, but designing apps instead of websites actually represents a huge shift in mindsets. Apps aren’t websites and shouldn’t be designed like them, either. Let’s talk about specifics. Apps have a completely different user interaction model from websites: taps vs. clicks, views vs. pages, buttons vs. links, etc. We believe a change in language when discussing app design helps us keep the right frame of mind.

In addition to a different interaction model, apps should have different modalities. Don’t overload the user with too much in one view; separate different functionality into different views. This is even more important on the iPhone than on the iPad, since screen space is even more constrained.