As offices in London's financial district clear out on a Friday evening, workers and students shoulder their way into Shoreditch Grind, a landmark of London hipsterdom in a once-gritty industrial zone. Some come for the hip-hop and indie-rock soundtrack, some for the burgers and smoothies. And this evening, many have come for a free cocktail courtesy of an app called Drinki. "It's helped me discover so many new drinks and places," says Alice Tuck, a 23-year-old psychology student who uses the app frequently on nights out. "It's an absolutely great incentive to discover London without busting your wallet."
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