Spectre is an iPhone app for a field investigation. You set the phone down and leave it still. The first quiet seconds become a baseline for the room, and the app then flags physical readings that depart from it: magnetic field, pressure, sound, motion, brightness, depth, and nearby radios.

Each of those stays its own lead, with the time, the sensor, the size of the change, and a short sample window. The Anomalies circle draws walls from the camera and LiDAR and keeps them until GPS shows the phone has moved.

A hit is an unusual physical reading an investigator can review. It is not a score, and it is not proof of anything beyond the sensor.