Selfycart, a self-checkout startup, wants to make it so shoppers never have to wait in line at the grocery store again. Selfycart is launching its service at Rainbow Grocery, a San Francisco-based cooperative grocery store. This means that when customers walk into the store, they can use the Selfycart app to scan items, pay for the items, and then leave the store without needing to wait in a line or interact with anyone. Before leaving the store, an associate can check the QR code to confirm that the items were paid for. Some stores do have self-checkout stations, but they're by no means widespread.