EMF Hunter is an iPhone app designed for entertainment purposes, utilizing the internal compass of compatible devices like iPhone 3GS and newer models. This app transforms your phone into an EMF (electromagnetic field) detector, allowing users to detect magnetic and electric fluctuations in their surroundings. It's a handy tool for teachers, students, technophiles, and even ghost hunters who are intrigued by magnetic fields.

The app provides features such as detecting magnetic field strength in all dimensions, an easy-to-read meter for quick strength assessment, LED icons that light up according to field strength, various graph views to monitor field values, a particle mode that correlates magnetic force with particle display, and the ability to start and pause detection at will. Additionally, the app calculates magnetic force in microteslas.