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4. My Kindle app won't dim the screen as much
I know this is a nit, but since I read on my phone every night before going to bed, it's one I feel keenly. I read in the dark and the Kindle app on the iPhone would dim down to almost no light.
By contrast, even by fiddling with Android and Kindle settings, I can't get the screen to dim down enough. I suspect there's an app that would do it, but I also suspect I'd have to root my phone just to get screen dimming. I'm not about to root my phone, and so I miss the screen dimming ability of my iPhone.
Now, that's dim! Image courtesy the iPhone Kindle app.