Oh Appy Day! gives you the scoop on the coolest apps from some of the coolest people anywhere. This week, fashionista Liz Lange shares her fave.

I am a Blackberry-aholic and I will NEVER give it up, but I carry an iphone JUST for the apps, in particular this one: Red Laser. When I first heard about it, I thought the founders must have been reading my diary. It scans bar codes and tells you where an item can be bought, near you, online, anywhere!

How I use it: I bring it into dressing rooms when I am shopping and scan the barcode of the item I am interested in buying to make sure that I am getting the best price, and that if I post it on shopafrolic.com, I recommend the retailer offering the best deal. I also use it to find an item in my particular size/color, if the store I am in is sold out.

This app is a game changer! -Liz

Oh Appy Day! Download the free Red Laser app for your Apple gadgets at iTunes.com.

Liz Lange is the creator of Liz Lange Maternity and the non-maternity line, Completely Me by Liz Lange, as well as the author of Liz Lange’s Maternity Style: How to Look Fabulous during the Most Fashion-Challenged Time. She’s also the co-founder of the popular woman’s shopping site, Shopafrolic.com.