Izdiham: Crowd Pressure overview

Izdiham helps you notice when your own movement changes in a dense crowd. It uses your phone's accelerometer, gyroscope, and rotation vector to distinguish regular walking from stop-and-go motion and irregular displacement. Everything important appears as one clear pressure shape and short, calm guidance supported by haptics only. When movement becomes irregular, the app shows measured body-position guidance, such as keeping space in front of your chest. It never uses sound. Its crowd-state analysis runs on the phone and continues when mobile service is unavailable. Nearby phones can exchange compact Bluetooth Low Energy advertisements without pairing or connections. A message is rebroadcast only after several independent nearby devices report the same state, and it travels using local flow direction rather than a map or GPS. A single phone can guide its owner but cannot send an alert to others. An optional setting can send a count of turbulent windows after an event. You can also send feedback from the app. Izdiham reports what this phone measures. It cannot see the whole crowd, guarantee safety, or replace venue staff and official instructions.