New Delhi: An app launched by Indian Prime Minister Narendra Modi’s government to track and contain the spread of the coronavirus is the fastest ever to reach 50 million users, while being dogged by privacy concerns.

Aarogya Setu — Hindi for Health care Bridge — alerts users if they come in contact with an infected person and informs them about health services they could contact. It garnered 50 million users in 13 days, tweeted Amitabh Kant, chief executive officer at government think tank Niti Aayog. That’s the fastest pace for any app including Facebook, he said.

Singapore also launched TraceTogether app last month. Apple Inc. and Google have joined hands to develop a technology to curb the spread of the virus by telling users they should quarantine or isolate themselves after contact with an infected individual.

“Digital technologies can be used to monitor the spread of Covid-19. Such initiatives, largely voluntary, have been successful in helping combat the pandemic in East Asia,” the World Bank said in its latest South Asia Economic Focus report.

Aarogya Setu compares unfavourably with TraceTogether, according to the Internet Freedom Foundation. While countries including Singapore say that contact tracing will be used strictly for disease control and cannot be used to enforce lockdowns or quarantines, Aarogya Setu retains the flexibility to do just that; other apps just collect one data point which is subsequently replaced with a scrubbed device identifier while Aarogya Setu collects multiple data points for personal and sensitive personal information which increases privacy risks.

“As such the Aarogya Setu application appears to clearly be inconsistent with privacy-first efforts,” Sidharth Deb, policy and parliamentary counsel at Internet Freedom Foundation, said in a working paper. “There is a need to immediately rollback the application or expedite measures to improve the app’s design and deployment in terms of trust, security and informational privacy.”

Representatives for India’s Health Ministry and Information Technology Ministry didn’t immediately reply to emails seeking comment. India Army’s advised its personnel that they can’t use the app while on office premises, operational areas and in other sensitive locations, the Print website reported. In his address to the nation Tuesday, Modi urged citizens to download Aarogya Setu. The app is available on Android’s Google Play — where it’s ranked as the top free app — and on Apple’s App Store.