Gallery’s LIMBO is a new utility which at the moment can be enjoyed only by Apple users.
Simplicity in the usage and manage of the App is one of the biggest advantages. However, it can avoid having unexpected situations for those who install it because they no longer have to worry about people using the mobile as if it were theirs.
As simple as open the App, choose the photo or photos to be showed with Guided Access enabled (iOS operating system tool) and the rest of the gallery will be safe.
Likewise, once the photos are being showed, the App avoids exiting without the code needed to leave the guided access mode, therefore, not just the gallery but also the rest of your phone will be safe under other hands.