 UC Browser also uses an outdated RC4 cipher cryptography with deprecated SSL 3 or even SSL 2 protocols, which have many security flaws.As of March 2014, UC Browser has over 500 million users, largely in China, India, and Indonesia, and as of 2016 it has more than 100 million monthly active users.According to the app analytics firm App Annie, UC Browser was the 8th most downloaded mobile app of the 2010–2019 decade.