The Kobo app. I can't stand full justification on narrow screens -- and, let's face it, among modern smartphones, iPhones have amongst the narrowest. Kobo lets me have ragged-right margins (plus all the other cool features one might expect, and it syncs locations with my Kobo E Ink devices). It's just a few lines of code to allow users to turn off full justification, and Kobo and iBooks both offer that (for iBooks, the switch is hidden in the Settings app); I really wish Kindle would offer it, too.
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