Binaural beats generator
Put on stereo headphones, choose a beat, press play. The left ear gets one tone, the right ear a slightly higher one, and your brain hears the difference as a slow pulse.
Presets
What binaural beats are
Heinrich Wilhelm Dove described the effect in 1839, and Gerald Oster brought it to wider attention in a 1973 Scientific American article, "Auditory Beats in the Brain". The recipe is simple: two pure tones, one per ear, a few hertz apart. The beat you hear is the difference between them.
That makes binaural beats a perception rather than a sound. Nothing in the air pulses at 6 Hz, which is also why they feel softer than the pulsing you hear from two tuning forks struck together. It only works under about 1,000 Hz, and best with carriers of roughly 100 to 500 Hz, because the brainstem can only compare the timing of the waves at lower pitches.
See where the beat comes from
Two steady tones, a few hertz apart. Move the gap and switch between speakers and headphones: the tones never change, only where they meet.
Through speakers the two waves add up in the room. Where peaks line up the sound swells, where they cancel it fades: a monaural beat you can measure with a microphone, 4 times a second.
Waves are drawn slowed down so you can see them; the beat rate is shown to scale over one second.
Watching two waves slip in and out of step teaches more than a paragraph can; ahaboo builds whole narrated lessons on that premise, from why the Moon shows phases to how photosynthesis works.
Which beat for which goal
These are the conventional pairings used across the research literature and most apps. They are starting points, not prescriptions.
| Goal | Band | Beat | Carrier |
|---|---|---|---|
| Sleep | Delta | 1–4 Hz | 100–150 Hz |
| Falling asleep, deep relaxation | Theta | 4–8 Hz | 150–250 Hz |
| Calm, anxiety relief | Alpha | 8–12 Hz | 200–400 Hz |
| Focus, study | Beta | 14–20 Hz | 200–300 Hz |
| Gamma experiments | Gamma | 40 Hz | 300–500 Hz |
Do binaural beats work?
They certainly produce a beat. The harder question is whether that beat nudges the brain towards the matching rhythm ("entrainment") and whether that changes how you feel.
- Brain activity: a 2023 systematic review in PLOS ONE (Ingendoh et al.) found 14 EEG studies that were split: some showed entrainment, others didn’t, and methods varied widely.
- Anxiety: a 2019 meta-analysis (Garcia-Argibay et al., Psychological Research) reported small-to-moderate effects on anxiety, memory and attention across 22 studies, with caveats about study quality.
- Sleep: evidence is sparse and mostly small studies. A calming, predictable sound at bedtime can help regardless of the beat.
The fair summary: low cost, low risk, possibly modest benefit. If a session helps you, use it; if it does nothing for you, that is a common result too.
Getting a good session
- Use wired or good Bluetooth headphones and check left and right aren’t swapped or mono-summed (accessibility "mono audio" settings kill the effect).
- Volume just above hearing it. Louder isn’t stronger.
- Give it 10 to 20 minutes. Sit or lie still, eyes closed.
- If the pure tone grates, add brown or pink noise underneath or switch to isochronic tones, which work on speakers.
Questions people ask
What are binaural beats?
An auditory illusion: when each ear hears a slightly different steady tone, you perceive a third, pulsing tone at the difference. 200 Hz left and 210 Hz right gives a 10 Hz beat.
Do binaural beats work?
They reliably create the perception of a beat. Whether they change brain activity or mood is less clear: studies are mixed, with some small positive results for anxiety and relaxation and many null findings.
Do binaural beats work without headphones?
No. On speakers both tones reach both ears and mix in the air, which produces an ordinary (monaural) beat instead. That still pulses, just differently.
What are the best binaural beats for sleep?
Most people use delta (1–4 Hz) or theta (4–8 Hz) beats on a low carrier (100–200 Hz), quiet, with brown noise and a timer. Evidence that they deepen sleep is weak, but they are a calm way to drift off.
Can binaural beats help anxiety?
A few trials report lower anxiety before surgery or dental work with binaural-beat audio, but effects are modest and not consistent. Treat them as a relaxation aid alongside, not instead of, proper support.
Are binaural beats dangerous?
Not at sensible volumes. Don’t use them while driving. People with epilepsy should talk to their doctor first.