Photo: iStock/LouieBaxter

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Only about 30 percent of American women regularly use sunscreen on both their face and other exposed skin, according to a recent report from the CDC. Consider downloading this mini sun-care manual, which clearly displays the UV index in your area using vibrant colors: Blues and greens mean that the average person should use modest sun protection (sunglasses and SPF 30+), while reds and purples signal a dangerously high index.

Bonus feature: The app also includes general sun safety advice, so you'll know when it's time to put on a hat or avoid going outside altogether.