"When customers are in a store there's often very limited information available about most products," Sharma said.
"If I see three laptops in the store but the information is limited, I can look through the mobile app and see which one is the best according to my needs."
Apps were now considered to be key to the future success of the retail sector, attracting potential customers from much further afield, he said.
Speaking at this month's South by Southwest Conference in Texas, Walmart's senior director of mobile and digital strategy Wendy Bergh told crowds her recent focus had been on "taking advantage of the way mobile can really bring the web into the store".
The Walmart philosophy was to have an Augmented Reality (AR) experience that was useful and interesting to the customer and not just a novelty, she said.
Sharma said the advantage to retailers of launching an app was that it would keep the customer in-store, rather than being lured away after Googling the product.
Consumers were becoming more and more forward by researching products before they purchased.
"Google can be very distracting. This is giving enough information to consumers so that they don't go anywhere else.
"This type of app won't stop them going elsewhere but it's helping to engage them with your brand."
Sharma said such apps were barely being seen in New Zealand yet, largely because of the speed and cost of our internet access.
"Mobility in retail is still under-used here compared to the US," he said.
"I think once someone brings this to the market the others will follow."
With Vodafone's recent 4G launch and the growing penetration of smartphones, New Zealanders would start becoming more mobile though.
"Within a few years, smart phones are going to have a bigger impact on the world than desktop internet ever did."