On Wednesday, US Secretary of State Mike Pompeo praised the ban on Chinese apps, including TickTock, saying New Delhi was ensuring its own security.
"We welcome India's ban on some mobile apps from China," Pompeo told reporters, adding that the move would "enhance India's integrity and national security" reports AFP.
TikTok on Tuesday denied sharing users' data with the Chinese government, after India banned the wildly popular app as ties with Beijing deteriorate sharply following a deadly border clash.
Blaming each other for the brutal hand-to-hand battle on June 15 as talks make little headway, the Asian giants have been bolstering their border forces as anti-China sentiment grows in India.
Prime Minister Narendra Modi's government on Monday banned 59 Chinese apps including TikTok, WeChat and Weibo.
The ministry of information technology said the apps "are engaged in activities... prejudicial to sovereignty and integrity of India, defence of India, security of state and public order".
The move mirrored growing unease about Chinese tech firms in other countries, in particular regarding telecom giant Huawei.
TikTok, owned by China's ByteDance, allows users to upload and share short videos and is spectacularly popular in India -- its 120 million users have made it the app's top international market.
On Tuesday, the head of TikTok India issued a statement saying the firm has "not shared any information of our users in India with any foreign government, including the Chinese government".
"Further if we are requested to in the future we would not do so," Nikhil Gandhi said, adding that "hundreds of millions of users, artists, story-tellers, educators and performers... (depend) on it for their livelihood."
It remains unclear, however, how the bans would work, with Indians who have downloaded TikTok on their phones still able to use the app on Tuesday.