Binaural Beats Generator
Slightly different tones per ear create a slow beat inside your head — headphones strictly required.
L 200 Hz · R 210 Hz · beat 10 Hz
ReadyHeadphones required
The beat only appears when each ear hears its own tone; over speakers it collapses into two plain tones.
Turn your system volume down first
Start at a low volume, especially with headphones and low bass tones, then raise it slowly.
Not medical advice: this tool is for relaxation/focus experiments only — not prevention, diagnosis, or treatment of any condition; evidence for effects is mixed. Do not use it if you have epilepsy or a history of seizures; stop immediately if you feel unwell.
This tool runs locally in your browser — no audio is uploaded.
How to use
- 1
Put headphones on
Binaural beats only exist when each ear hears its own tone; over speakers the effect disappears. Any headphones work.
- 2
Pick a preset or set your own
Presets set the beat frequency: Delta 1–4 Hz, Theta 4–8 Hz, Alpha 8–14 Hz, Beta 14–30 Hz, Gamma 30–40 Hz. You can also dial any beat (1–40 Hz) and carrier (100–500 Hz).
- 3
Play at low volume
A quiet background level is enough — the beat should be subtle. Volume default is 40%; many listeners prefer lower.
How it works & limits
The generator feeds a carrier tone (for example 200 Hz) to the left ear and carrier-plus-beat (210 Hz for a 10 Hz beat) to the right. Your brainstem perceives the small difference as a slow wavering beat — that is the binaural beat, an auditory illusion first described in the 19th century.
Scientific evidence for strong effects on sleep, focus, or mood is mixed; treat this as an interesting listening experience to try, not a treatment. It is not medical advice and not a therapy. If you have epilepsy or a history of seizures, or experience discomfort, do not use it. Research typically studies beats under 30 Hz at comfortable volumes with stereo headphones.
FAQ
Why do headphones matter so much here?
Each ear must receive only its own tone. With speakers, both tones reach both ears and mix in the air — you hear two tones, not one beating illusion.
Which preset should I try for sleep or focus?
Common lore maps Delta/Theta to sleep and relaxation, Alpha to calm focus, Beta/Gamma to alertness — but effects vary and evidence is limited. Experiment at low volume; stop if it feels unpleasant.
Is this medical or scientific therapy?
No. It is a sound generator, not a treatment for any condition. Do not use it to replace care; if you have epilepsy or seizure history, avoid it.
Why is the carrier limited to 100–500 Hz?
The beat is easiest to perceive when the carrier is a few hundred hertz; much above that the two tones blur together and the effect weakens.
Are the tones safe at normal volume?
At low, comfortable volume, yes — they are ordinary sine tones. Keep it quiet enough that you could still hear someone speaking to you.
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