Ghost Face Detector is a free iPhone application developed by Mikhail Frenkel. The program focuses on face tracking, offering users a unique experience with ghostly face outlines. It provides features such as real-time face tracking during camera operation, the ability to switch between front and selfie cameras, and options to record videos and take photos with or without the ghostly contour. Users can view captured media, search for ghost faces, and share their findings with friends via the standard "Share" service. The app does not require logins or connections to servers, except for Unity ADS. Ghost Face Detector utilizes Unity3D, openCV, cascade haara, and dlib technologies commonly found in face mask overlay applications, with limitations in detecting faces looking directly into the camera or at a slight angle. Despite potential CPU resource usage, the app offers a fun and entertaining way to interact with ghostly face outlines.