The app available in France is called “Juif ou pas Juif” (Jew or not Jew) and promises to reveal who is Jewish. “All the information is already available online,” says creator Johann Levy, who lives in Marseille and is himself, Jewish. “I’m just compiling it all.” The app costs 79 euro cents and has provoked outrage.

“I don’t know if its irresponsible, but it’s incredibly dangerous,” said Alain Jakubowicz, president of Licra, a French anti-semitism group.