I used to have keepsafe years ago, it actually had a second vault you could show suspicious friends and the real vault had different password with no indication that there are two. It depends on which password you typed in....
I believe you can hide apps there too, but read the app writeup to make sure.. Keepsafe was great back in early galaxy days... The new devices have stock private modes now, so I just put stuff in there that I rarely look at...