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Showing posts with the label usability

Minimum sensible button size on iPhone

I'm designing an iPhone app that features a rather large set of onscreen rounded rect buttons. Given finger-based touchscreen UI, what do you think would be the smallest sensible button size? I need to fit as many of them as I can in the viewport without compromising the usability too much. Maybe there's an Apple-recommended minimum size? Right now it's 33x33, and it looked OK on a simulator, but I was playing with the app on a real phone last night, and it was awkward - the buttons felt too small.