Disclosed herein are system, method, and computer program product embodiments for providing a mixed-cart solution for an in-store app. An embodiment operates by receiving a request to add an item from a physical store to an associate shopping cart associated with an account. It is determined that the account is additionally associated with an online shopping cart associated with the store, and that the requested item does not exist in the online shopping cart. It selected item is added to the associate shopping cart. Both the online shopping cart and the associate shopping cart are provided to a computing device configured to simultaneously display both the online shopping cart and the associate shopping cart.