Use the current time as your password. Even if others somehow knew your password, when a minute passes they can no longer unlock it.
No one will ever guess that the time is the password with this applock. Since the time is the password, it changes every minute, giving your apps a great level of security. Install now.
Since your password is changing every minute, no one would ever guess what your password is Lock WhatsApp, Facebook, Messenger, Snapchat, Instagram, and so on. Prevent others from opening your social media apps.