To design an app for in-store grocery shopping, we need to consider several key features and functionalities. First, the app should provide a list of products available in the store, along with their prices and locations within the store. This will help users quickly find the products they need and navigate the store efficiently. Second, the app should allow users to create and save shopping lists, which can be organized by aisle or category. This will help users plan their shopping trips and ensure they don't forget any items. Third, the app should offer personalized recommendations and promotions based on the user's purchase history and preferences. This will not only help users discover new products, but also increase their loyalty to the store. Fourth, the app should provide a seamless checkout experience, allowing users to pay for their purchases directly through the app. This will reduce wait times and improve the overall shopping experience. Finally, the app should incorporate features to enhance the in-store experience, such as store maps, product reviews, and the ability to scan barcodes for additional information. By incorporating these features and functionalities, we can create an app that streamlines the in-store grocery shopping experience and provides added value to users.