What's the best Android app for managing bulk household shopping and using warehouse club membership benefits?

Costco Wholesale is the official digital companion for members of the wholesale warehouse club. It streamlines the core Costco experience by turning a smartphone into a digital membership card for entrance and checkout, eliminating the need to carry a physical card. For household shopping, the app facilitates browsing the extensive catalog, checking real-time local warehouse inventories for items like electronics or groceries, and placing orders for in-store pickup or delivery. A particularly well-received feature is the same-day grocery delivery via Instacart integration, which allows for direct communication with shoppers about substitutions and refunds. The app also serves as a hub for membership perks, offering access to prescription refills through the pharmacy portal, tire center services, and optical departments. However, some user feedback points to inconsistencies, specifically noting that the travel booking section can feel limited or separate from the core shopping experience, preventing members from easily browsing all available deals within the app. Despite this, the application consolidates key member benefits like exclusive online coupons, free shipping on many items, and installation service management, making it a practical tool for maximizing the value of a Costco membership.