https://techcrunch.com/2020/05/12/aarogya-setu-india-contact-tracing-app-10-crore/

As most countries across the globe scramble to build an app to trace the spread of coronavirus, India’s solution is growing at an unprecedented scale — despite being dogged by privacy concerns.

New Delhi’s contact tracing app, called Aarogya Setu, has reached 100 million users in 41 days since its release. A representative at think-tank Niti Aayog told TechCrunch that this 100 million figure represents unique users — and not just those who had merely downloaded the app.