How the ghost hunting simulator phone app works
It has a dictionary of several thousand words. Theoretically, spirits speak in frequencies lower than can be heard with the ear, and this app can pick those words up. The word then appears on the screen. There is also a meter that visualizes the strength of the sound frequency. Words are stored in a database for later review.
Essentially, it is an app for electronic voice phenomenon (EVP).
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The main screen shows the strength of the sound. It also features a word from the dictionary that it understands the spirit voice to say.
After the session is complete you can review the word history. This allows you to put together full thoughts or ideas a spirit may be trying to communicate. This is a really cool feature.