MLock - Secure Cloud Messaging is a useful app for those who wish to ensure their messages remain confidential and secure from prying eyes. This app enables you to save your messages in an archive that can only be accessed by using either your scanned fingerprints or a password that you have entered. It's important to keep in mind your password, as you won't be able to access your private conversations without it.

The app is for free and will not require you to spend a single penny. Download now on the Google Play Store and find out more about it.