For hunting ghosts
Ghost Sensor EM4 Detector is one of several “ghost-hunting” apps that can be fun whether you believe in ghosts or not. It uses a phone’s sensors to detect changes in electromagnetic fields, and the meter’s needle is supposed to move whenever there’s a spirit nearby. The interface makes your phone look like a gadget from Ghostbusters.
Ghost Hunting Tools claims to be for fun only, but the iOS app includes EMF meters and EVP (“electronic voice phenomena”) detection—tools used by pro ghost hunters.
iOvilus can allegedly detect ghost whispers using “instrumental transcommunication.” Whatever your interpretation, the noises that the iOS app produces sure do sound creepy.
Ghostcom Radar Spirit Detector shows you on a radar display where ghosts might be lurking inside a haunted house. It also lets users ask questions of the spirit world, which it answers with mysterious messages.