By installing one of the apps below you can be sure that whoever will be using your device will not stumble upon your very personal applications.
AppLock - very simple but still very powerful. You can choose which apps you wish to be blocked or whether you would like to block all of your applications. After having installed the app you need to come up with a password and also give your email address in case you forgot that password and wanted to geit it back. Then choose and tick those applications you wish to be blocked. Simple, isn't it?
What's more, you can also block some of the functions like answering or making calls, setting your device or uninstalling applications. Instead of a password you can also choose to have a graphic sign as your lock - it is less safe, however more comfortable. You can also find some extras in the Google Play which will make the appearance of this app more beautiful.
Smart App Protector - this app is fairly similar to the previously mentioned one, however it includes some more useful functions. One of those features is the Observer Mode which records with the front camera the person who typed in the wrong password. What's more, you can also block the device by simply sending a text messege. You can also choose the method of unlocking (password or graphic sign) and choose the appearance of the app.
Visidon Applock - this app is a bit more different then the previous two. It unlocks the device by recognizing our face. It uses the new techonology of face recognition. Firstly, we have to get our face recognized and then set and backup password in case of any problems with this app. You can also add this app to administrative applications which will disable anyone who is trying to delete it.