Binaural Beats Generator
Play a slightly different tone in each ear to create delta, theta, alpha, beta or gamma beats for sleep, focus and meditation. Pick a preset or set your own base and beat frequency, add a sleep timer — all generated live in your browser.
Headphones required. The beat forms inside your ears when each side hears its own tone. Through speakers the tones mix in the air and the effect disappears. Keep the volume gentle.
The left ear plays the base frequency and the right ear plays the base plus the beat frequency, so your brain perceives a pulse at the difference. Lower base tones (around 100–250 Hz) tend to feel most comfortable. Start quiet and adjust to taste.
How the Binaural Beats Generator works
Binaural beats play a steady tone in each ear that differ by a small amount — say 200 Hz on the left and 206 Hz on the right — and your brain fills in a slow 6 Hz pulse that is not actually present in the sound. That perceived beat frequency is grouped into the classic brainwave bands: delta for deep sleep, theta for meditation, alpha for calm relaxation, beta for alert focus and gamma for concentration. Put on headphones, press Play, choose a preset or drag the beat and base sliders, and set a sleep timer so it fades out on its own. Everything runs in your browser with the Web Audio API — no files, no uploads. Prefer steady background sound? Try the White Noise Machine or Brown Noise, or play any single frequency with the Tone Generator.
Frequently Asked Questions
What are binaural beats and how do they work?
A binaural beat is created by playing a slightly different frequency in each ear — for example 200 Hz on the left and 206 Hz on the right. Your brain perceives the difference as a slow pulsing tone, here 6 Hz, even though no 6 Hz sound actually exists in the audio. Because the effect is generated inside your auditory system when the two ears combine the signals, you must listen on headphones with a distinct left and right channel. The difference between the two tones is called the beat frequency.
Do I need headphones for binaural beats?
Yes — headphones or earphones are required so that each ear hears only its own tone. Through speakers the two tones mix in the air before they reach you, so you hear a single steady tone and no binaural beat. Any stereo headphones work — set a gentle volume, since the carrier tones are pure and can sound louder than they seem.
Which frequency should I use for sleep, focus or meditation?
The frequency to choose depends on your goal, and the presets map to the classic brainwave bands. Delta (about 0.5 to 4 Hz) is associated with deep sleep, theta (4 to 8 Hz) with meditation and drowsiness, alpha (8 to 13 Hz) with relaxed calm, beta (13 to 30 Hz) with alert focus, and gamma (30 Hz and up) with concentration. Pick the band that matches your goal, keep the base tone comfortable, and start with the beat frequency the preset chooses. There is no single correct value — experiment with what feels best to you.
Are binaural beats safe and do they actually work?
Binaural beats are safe for most people at a sensible volume, and everything here is generated live in your browser — nothing is recorded or uploaded. That said, the scientific evidence for binaural beats influencing mood, focus or sleep is mixed and far from settled, so treat them as a relaxation aid rather than a medical treatment. Do not use them while driving or operating machinery, and if you have epilepsy or a seizure disorder, or any concern about your hearing, speak to a doctor first.
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