India’s Aarogya Setu quickly became the worlds most downloaded app reaching 116 Million downloads in June after its April 2nd release date. Despite this large number of downloads, this only represented a 9% uptake nationwide. 98% of Aarogya Setu users are on Androids. This allows for a centralized architecture because Androids are compatible with a centralized structure, whereas iPhones are not. The app includes self-assessment tools and risk scores that are communicated to the user. As of June 9th, the app had identified 500,000 Bluetooth contacts. Bluetooth contacts and those who are classified as “needing assistance” from their self-assessment are contacted by the health authority. The India National Health Authority had reached out to 900,000 people based on these factors – 24% of those contacted have tested COVID-positive. The overall COVID-19 testing efficiency was 4.65% on May 26th. The government is using the centralized data to map the virus and take an epidemiological approach to its mitigation. Using syndromic mapping, they have predicted thousands of hotspots, many of which have proven to be real hotspots weeks later. The exact number of correct hotspot predictions is unclear.