Smartphone app runs store

In a small Swedish town called Viker there is a grocery store where no employee works: it is run by a smartphone app. Customers are required to register for the service and download a smartphone app, which they can then use to unlock the door and scan items they wish to buy. At the end of each month the app sends out an invoice to charge users for their purchases. Running the store does require a little bit of human involvement, though: when inventory starts getting low, restocking needs to be done manually.