Dashers (DoorDash delivery drivers) get a guaranteed minimum for each order, which they see before deciding to accept the order. They won't know how much you tipped until after the delivery. \r With Grubhub, however, drivers will see how much you tip and then decide if they want to accept the order. If you want to wait until receiving your food to determine the quality of service, you can use the notes section on the app to say that you will tip in cash.