Nielsen has identified the top mobile shopping apps for June in the US market. The list is as follows:
While eBay and Amazon have been on top of this list since its inception, ShopKick and Walgreens are a bit of surprise to me. However it's not clear precisely how Nielsen defines the "shopping" category.
While eBay had a little over 1 million more users than Amazon (13.16 vs. 12.12 million) the time spent with the eBay app was much more than Amazon users (1:04 vs. 18 minutes). The discrepancy can likely be explained in the fact that Amazon users are probably much more directed, looking up prices, reviews and product availability while eBay users probably browse and look at many more pages.
Beating both by a mile was ShopKick, with three hours, 19 minutes (3:19) on average June. That kind of engagement is truly impressive.