Good but room for improvement
So I leave my speakers off most of the time, so the fact it makes shutter sound doesn’t bother me, however the other reviewers are right, this app should give you the option to turn off visual and audible feedback, to be truly stealthy.
Set the “save to” directory to a cloud based storage folder (i.e. DropBox or Box), and you can even access the photos remotely when you aren’t near your Mac.
Doctauri about Snoop Catcher, v1.0