What is China’s ‘Are you dead?’ app, and why is it going viral?

China’s viral safety app Sileme, known for its blunt "Are you dead?" name, is rebranding as Demumu for international users. Designed for solo dwellers, the tool alerts emergency contacts if users miss a 48-hour check-in. While the name change aims for cultural sensitivity, fans argue the original's stark honesty was key to its global success.