iOS 7 and Color Temperature

iOS devices are calibrated to have cooler white points closer to 7000K rather than the typical 6500K:

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via images.anandtech.com

(The iPhone 5 has a white point of about 6900K.)

iOS 7 seems to have been designed for cooler displays. On a display calibrated to 6500K, iOS 7's colors look garish. On a display calibrated to 7000K, everything looks more subtle and a lot nicer.