Ordering dinner to the door was once an occasional treat reserved for pizza and Chinese takeaway, but the food (0) DELIVERY (DELIVER) industry has since been transformed by the arrival of smartphone apps. The obvious 1CONVENIENT of tapping through a menu and tracking a courier's progress on a map has won over millions of 2CUSTOM, including many who might previously have cooked at home. The 3POPULAR of such services has in turn changed the economics of the restaurant business, with many establishments now depending on delivery for a substantial share of their revenue. The sector is fiercely 4COMPETE, however, and most of the major apps have yet to become consistently 5PROFIT. Drivers and couriers complain that the 6RELY of their income is undermined by algorithms they cannot see and by frequent changes to rates. Consumers enjoy an almost bewildering range of 7CHOOSE but are increasingly aware that heavy 8DEPEND on delivery apps is neither particularly healthy nor especially kind to the local restaurants they claim to love.