Perhaps most importantly, the app lets you easily buy an item online that you don't find in the store. So if you're shopping for a pink bike, and the store you're in only has it in blue, you can tap on the app and instantly order the pink bike.
The result: Two weeks after Walmart launched "in-store mode" with its app, roughly 60 percent of its shoppers opted to use it. Moreover, about 12 percent of Walmart's online sales are now coming from customers who are inside a store and using "in-store mode." All of Walmart's 4,000 U.S. stores have an "in-store app.""