Free Binaural Beats Lab

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MindState - Michiel Roos

Try it out

Set the desired carrier- and beat frequencies and press the play button. The carrier frequency will be the base tone.

The binaural tone is created by dividing it by two and and adding one half to the carrier frequency going to the left ear and subtracting one half from the carrier frequency going to the right ear.

Slide the balance slider to the left or right to hear the actual tones going into your left and right ear. Then slide the balance slider back to the center.

Carrier Frequency


Beat Frequency




Free for all, Online Binaural Beat generator

This is a totally free online Binaural Beat generator built in JavaScript. It was built using audiolib.js and jCanvas.

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MindState - Michiel Roos

How it works

Binaural beats or binaural tones are auditory processing artifacts, or apparent sounds, the perception of which arises in the brain for specific physical stimuli. This effect was discovered in 1839 by Heinrich Wilhelm Dove, and earned greater public awareness in the late 20th century based on claims that binaural beats could help induce relaxation, meditation, creativity and other desirable mental states.

The effect on the brainwaves depends on the difference in frequencies of each tone: for example, if 300 Hz was played in one ear and 310 in the other, then the binaural beat would have a frequency of 10 Hz.

The brain produces a phenomenon resulting in low-frequency pulsations in the amplitude and sound localisation of a perceived sound when two tones at slightly different frequencies are presented separately, one to each of a subject's ears, using stereo headphones.

A beating tone will be perceived, as if the two tones mixed naturally, out of the brain. The frequencies of the tones must be below 1,000 hertz for the beating to be noticeable. The difference between the two frequencies must be small (less than or equal to 30 Hz) for the effect to occur; otherwise, the two tones will be heard separately and no beat will be perceived.