Ghostalker is a comprehensive paranormal sensor app for iPhone users. It functions as a "Spirit Box," utilizing sensor data to generate spoken words. With a database of over a thousand commonly used words, Ghostalker interprets changes in various sensors present in your device, such as vibration, rotation, GPS, gyroscope, light, magnetic fields, and proximity. Unlike random word generators, Ghostalker uses raw sensor data to determine its responses.

The full version of Ghostalker includes a logging feature that records spoken words for later review, export, or deletion. Additionally, users can manage a custom dictionary to personalize their experience by adding specific words or phrases. The app is designed to provide raw data interpretations, leaving users to interpret the results in their own way.