Do not but for iPhones 6 and on.
I have an iPhone 6s Plus. As others have said the makers abandoned this app for the PS2. Which is no longer available in our county. It was amazing. This app just crashes, cannot really support the features of ios8 and really cannot support ios9. I wouldnt recommend it now.
DaPanda420 about
Picture Safe - Hidden Photos, v2.9.2