Because with the Once app you have a whole day to decide on the one match selected for you. When Jean Meyer returned to Paris after traveling abroad for several years, he was surprised to find so many of his friends still single. The fact that his smart, attractive female friends in their 30s didn’t have partners was particularly confusing. “My first reaction was, why wouldn’t they try a dating app?” Meyer says. He quickly learned they had tried them all and were fed up.