Do you want to know if you search for people that aren’t on your friend list, if these people will ever find out you have been searching for them/visiting their profile?
Answer to “Searching for people that aren’t in my friend list?”
There is not any type of apps who tells about who visited our profile.
The apps you’re asking about are just fake apps.
I suggest you not to use those apps because when you open these apps and Click “Allow” ..you allow them to get access to your every personal information. Some these type of apps are also being use to hijack facebook accounts.