The Australian federal government has announced plans to introduce a contact tracing mobile app to help curb COVID-19’s spread in Australia. Roba Abbas and Katina Michael write in The Conversation that rather than collecting location data directly from mobile operators, the proposed TraceTogether app will use Bluetooth technology to sense whether users who have voluntarily opted-in have come within nine metres of one another. Contact tracing apps generally store 14-21 days of interaction data between participating devices to help monitor the spread of a disease. The TraceTogether app has been available in Singapore since March 20, and its reception there may help shed light on how the new tech will fare in Australia.