Various Halloween apps are now available for parents are concerned about the safety of their children.
The Trick or Tracker app from Iconosys lets parents monitor their whereabouts by providing location updates which arrive via text messages.
Children can also send a distress signal, which instantly sends their location.
Another app, the Android, sets a maximum distance that the child can stray from home and notifies the parent when they have gone too far.
Digital Dudz lets users create an instant costume using their smartphone, a T-shirt and some duct tape.
It features animations such as a live beating heart filmed during open heart surgery. This can be into their costume by making a cut out in the T-shirt and securing the smartphone with duct tape.
Another app called Pumpkin Pal lets people create their own virtual jack-o-lanterns.