I-Doser is an application for the playback of proprietary audio developed by Nick Ashton. The audio files for the player contains binaural beats that are claimed to stimulate specific mental states. Most of these binaural beats are named after prohibited recreational drugs. The audio technology used for the I-Doser uses a GPL-licensed binaural beat generator. Binaural beats are auditory processing artifacts that stimulate specific physical stimuli in the brain. Binaural beats can help induce relaxation, creativity, meditation, and altered mental states. The I-Doser player is a free download but the audio tracks have to be purchased. These tracks are usually 30 to 40 minutes long and are administered from the MAC and PC player with a program called I-Doser. Tracks are classified according to the perceived effects like relaxation, mental improvement (Brain+), stimulation of specific brainwaves (Alpha, Beta, and Theta), or the drug-like effects of the brand name counterparts. The operating systems used used are Windows, Mac OS X, and mobile applications for iOS and Android.