One reason often given that Apple wouldn’t make a smaller (cheaper) iPad,
is that apps would have to be re-designed to fit a third screen size. The
iPhone has always been 3.5″ and the iPad has always been 9.7″, giving
developers 2 screen sizes to support, if they want to have their app on all
iOS devices. Adding a third size to the mix would have to gain consumers
and Apple a lot, to be worth the increased fragmentation in the App
store. The problem is that, as buttons shrink, they get difficult to press,
given our fat fingers. (This isn’t a big deal on computers, because the
point on a mouse is always 1 pixel.)
However, it looks like Apple have built in a redundancy that would allow
existing iPad apps to shrink to 7.85″ and still be usable.
The original iPhone screen was 163 PPI, and Apple’s design guidelines state
44px by 44px is the smallest comfortable size for a button (or any tappable
area) at that pixel density. The design guidelines for the iPad uses the
same minimum pixel-size, despite it’s screen having a lower density. The
result is that the smallest allowed button on an iPad is physically bigger
than on an iPhone. Shrinking the iPad to 7.85″ and giving it the original
iPad’s resolution (1024 x 768) gets to the 163 PPI of the original iPhone.
It would run iPad apps simply shruken to fit the screen, and despite
everything being smaller, buttons are still big enough to comfortably use.
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