While doing some fragrance research the other day (a nerdy thing only beauty writers do), I got wind of a fabulous app -- the iPerfumer. It's a perfume concierge by Givaudan (a company that creates fragrances for a ton of popular brands) that's free of charge. Upon this discovery, I did some more digital digging and found what I think are the 5 best beauty apps. They're pretty sweet. Have you tried a beauty life-changing app that's not on this list (like Total Beauty's nifty product-finding app)? Do share.

Age Defying Tricks, $.99

A compendium of advice from top beauty mags like Vogue and cosmetic companies like Aveda, this app boasts more than 100 tips and insider how-tos like: "Heavy powders tend to make the skin look dry and accentuate lines. Opt for a lightweight foundation with light-reflecting ingredients to brighten the skin." Won't solve world hunger, but sometimes the right tip can make a big difference.

Haircaster, $.99

Want to know whether it's even worth blowing out your hair today? One glance at Haircaster will give the details of your local forecast that YOU care about -- the humidity, chance of rain and wind rate -- and let you decide in an instant whether to just throw your hair into a ponytail and call it a day. Knowledge, as they say, is power.

Celebrity Makeup Looks, FREE

Want to look like your favorite star, but don't know how to begin? This cool app boasts nearly 30 instructional videos that will walk you through getting looks as varied as Angelina Jolie's "Easy Smokey Eye" and Miley Cyrus' "Green Eye Shadow Look."

iStylist Makeover, $.99

Been contemplating a drastic Pixie cut or switching to platinum blonde, but just can't seem to get the guts to throw the switch? Upload a photo of yourself to iStylist Makeover and, presto, you'll see yourself in any style or shade you fancy. The bonus? You can post your "new" self on Facebook to have friends weigh in before you even get anywhere near a pair of scissors!

OPI, FREE

Back in the day you had to hide in the aisles of your local drugstore and sneak swipes of polish onto your nails if you wanted to test-drive a color before committing. Now, thanks to OPI, you can try on polishes from its vast collection on a virtual hand that matches your skin tone. Think of all the time you'll save hemming and hawing at the nail spa, the nearest one of which, the app will locate for you.