NOTE: REDMI,OPPO,VIVO users, read the full description, otherwise the app may not work for you.
This application enables users to lock their selected WhatsApp conversations with a password without locking the entire application. Fingerprint authentication is also supported for devices with fingerprint sensor.

For phones having Android other than the stock versions( Redmi, Honor, Oppo) you need to lock the app in memory such that the background service is not killed by android.