We all know that makeup has an expiration date, but who remembers when that is?
Unlike, say, eggs or milk, there's nothing stamped on a tube of lipstick that indicates when to toss it. And unless you're blessed with a stunning memory, who can recall whether that wand of mascara is 3 months or -- admit it, you hang on to stuff -- 3 years old?
You, with the click of a button on your iPhone or Android. There are several apps that keep track of your makeup and remind you when it's time to toss, including Makeup Life, Beauty Alert! and Check Your Cosmetic.