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They promise to become the kings of “zero waste” in just a few clicks. And save a lot of money. In these times of tension on purchasing power, anti-waste apps have quickly become a compass for smart consumption. Some offer to collect, for cheap, soon-to-be-expired unsold items from our neighborhood grocery stores; others help us, when we are short of ideas, to find recipes for cooking leftovers; still others manage the contents of our fridges and our cupboards according to the rhythm of expiry dates.