Grocery App Users, 2017-2022 [CHART] Grocery apps are some of the fastest-growing apps in the US. This year, 18.0 million US adults will use a grocery app at least once a month, up 49.6% over last year. Share:Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)