WhatsApp vs Signal vs Telegram: Which is More Secure Facebook-owned WhatsApp’s Privacy Policy updates have prompted unhappy users to look for alternative apps. Find out which of the three most popular messaging apps is more secure. advertisement HIGHLIGHTS WhatsApp has updated its Privacy policy allowing other Facebook owned companies access to WhatsApp data. Sparked by concerns over user data privacy, people have been turning to alternative messaging apps for increased security. The second most popular messaging app Telegram and a new entrant Signal (which has been endorsed by Elon Musk) also offer some impressive security features. Whatsapp currently is the largest messaging service in the world with over 2 billion monthly active users. Following that, Telegram accounts for 400 million and Signal stands at a ballpark of 10-20 million monthly active users. Simply looking at the raw numbers would suggest that WhatsApp is hugely popular and almost ubiquitous while Telegram is catching up and Signal seems to have just joined the million downloads race. However, numbers do not often tell you the entire story, hence here we do a comprehensive comparison of the three app’s security and features.