Hello, my name is Dan.
I will do my best to help you, the only stupid question is the unasked one.
You have to ask yourself what the purpose of a password XXXXX It is like a bank vault combination, someone has to know it or the vault stays closed.
Too complex, toast to remember, too easy and you have everyone inside.
An app to auto input defeats the entire purpose of the password.
If you have stuff so sensitive that it is beyond top-secret then encrypt it then encrypt the encryption.
Trouble is then it may be out of your reach.
What you are asking for is not at all practical, it will only led to more problems down the road.
So, no there does not exist an app like that for less that the high six figures and then you have to deal with the NSA.
Hope that helps.