Free binaural beat generator
Two sine tones a few hertz apart, one in each ear. Set the beat, pick a carrier, add a noise bed if you want one, and start the timer. Everything runs in this tab.
A binaural beat is not a sound in the recording — it is the difference between two. Play 200 Hz in the left ear and 210 Hz in the right and the ears cannot mix them in the air, so the 10 Hz difference is only assembled once the two signals meet in the brainstem. That is why binaural beats need headphones and why a speaker version of the same file does nothing.
How to use it
- Put headphones on. Both ears, wired or stereo Bluetooth — a single earbud or a mono speaker cancels the effect. Test your stereo in 10 seconds if you are not sure.
- Pick a preset, or set the beat frequency yourself. The beat is the slow number (0.5–40 Hz); the carrier is the pitch you actually hear.
- Set the volume low. This is background sound; if it is loud enough to notice all the time, it is too loud to work through.
- Choose a timer. It fades out over the last eight seconds instead of cutting, which matters if you fall asleep to it.
What each control does
| Control | Range | What it changes |
|---|---|---|
| Beat frequency | 0.5–40 Hz | The difference between the two ears — the “beat” itself. Lower is slower and duller; higher is a faster flutter. |
| Carrier tone | 40–1000 Hz | The pitch both ears hear. Beats are most audible with carriers between roughly 100 and 500 Hz; above that the difference gets harder to perceive. |
| Tone mode | Binaural · isochronic · pure | Binaural needs headphones. Isochronic pulses a single tone and works on speakers. Pure is one steady tone with no beat at all. |
| Background noise | White · pink · brown · green | A noise bed masks the room. Compare the colours — brown is the low rumble, white is the bright hiss. |
| Timer | Up to 8 hours | Counts on the audio clock, not a page timer, so a backgrounded tab still stops on time. |
Which beat frequency should I start with?
The bands below are named after EEG rhythms, and the names are a map of the territory rather than a promise about what the sound does to you. Pick by how the session should feel, not by the label:
| Band | Beat | Usually chosen for | Player |
|---|---|---|---|
| Delta | 0.5–4 Hz | Sleep and long overnight sessions | Sleep player |
| Theta | 4–8 Hz | Wind-down, meditation, naps | Meditation |
| Alpha | 8–13 Hz | Relaxed reading and low-stakes work | Focus player |
| Beta | 13–30 Hz | Timed work blocks and study sessions | Study player |
| Gamma | 30–40 Hz | Short high-alertness blocks | 40 Hz player |
What this generator is not
It is a tone generator. It does not treat anything, it is not a medical device, and the research on brainwave entrainment is smaller and more mixed than the internet suggests — see what the evidence actually says before you build a routine around it. What it does reliably is give you a steady, predictable, ad-free sound you can control down to the hertz.
There is no account, no session cap, no email wall, and no analytics script on this page. Nothing you set here leaves your browser.
More players on this site
Questions
Do I really need headphones?
For binaural beats, yes — the effect is built from the difference between the ears, so a speaker or a single earbud removes it. Isochronic tones and noise beds work on speakers; switch the tone mode if you cannot wear headphones.
How long should a session be?
Most people use 20 to 60 minutes. Long overnight sessions are common for sleep; the timer goes to eight hours and fades out rather than stopping abruptly.
Is it free, and what is the catch?
It is free with no account, no time limit and no export limit. The site has no ads on the player pages and no analytics on this page.
Why does the beat sound like a wobble rather than a pulse?
That wobble is the beat. At low frequencies it is a slow swaying between the ears; above about 20 Hz it turns into a rough flutter. If you want a clear on/off pulse instead, use isochronic mode.
Can I share the exact session I am using?
Yes. The player writes its settings into the address bar, so copying the URL shares the beat, carrier, noise and timer you had set.
Running this on a phone? The Brainwave Generator app keeps playing with the screen off, works without a connection, and carries the same engine. Free on iOS and Android.