Mindroid is an AVS (Auditory Visual Stimulation device – aka Mind Machine or Psychowalkman) app for Android. It provides each of your brain hemispheres with a signal (either audible or visual) with a slightly different frequency in order to stimulate your brain waves. For more info on this phenomenon please refer to this Wikipeadia article.
The aim of this app is to induce either relaxation, meditation, creativity or sleep state of your mind depending on the selected program. Audible stimulation is full-featured and comparable with single purpose AVS devices. Headphones needs to be used in order for the audible stimulation to be effective! Visual stimulation is experimental. In order to perform visual stimulation close your eyes and match the red spots on your display with your eyes.
Mindroid is fully compatible and encouraged to be used with Google Cardboard or any similar or any similar home brew solution. If you bought the full version, install the Unlock on top of the current installation (do not uninstall Mindroid).