The messaging app was downloaded 63 million times last month, 3.8 times its downloads in the same month a year ago.
While TikTok came in a close second followed by Signal and Facebook, WhatsApp slid to the fifth position from its earlier third place, in January.
TikTok emerged as the second most installed non-gaming app worldwide last month with close to 62 million installs, Sensor Tower said.
WhatsApp, on the other hand, was the third-most installed app on both Apple’s App Store and the Google Play Store in December 2020.
Finally, Zoom fell from its December 2020 #5 spot to seventh most downloaded in January 2021.