Precise binaural beats and entrainment programs for sleep, meditation, and focus — with the dials the big apps took away. Real carrier & beat frequencies, descent programs, and modes that work with or without headphones.
The real engine, running in your browser. Put headphones on, choose Deep Sleep, and press play.
🎧 Binaural needs headphones (each ear gets its own tone). No headphones? Try Unwind — it's isochronic.
Not another spa-music app. The controls serious practitioners want, with the audio synthesized in real time — so it's precise, offline, and private.
True binaural (per-ear carriers), isochronic pulses for speakers, and monaural beats — pick what fits your setup.
Glide the beat from alert beta down into deep delta over a session — the way real protocols ease you into sleep.
Set the carrier and beat frequency to the exact Hz. Schumann 7.83, 528, 432 — all there, plus your own.
Brown, pink, and white noise generated live and mixable under the tone to mask the room and ease pure-tone fatigue.
Independent per-ear gain for hearing asymmetry — without cross-mixing the channels and weakening the beat.
Graceful fade-out timer, background playback, lock-screen controls. No account, no streaming, fully private.
Play two slightly different tones — one in each ear — and the brain perceives the difference as a "beat." The frequency-following response nudges your brainwaves toward it.
| Band | Hz | What we tune it for |
|---|---|---|
| Delta | 0.5–4 | Deep sleep, recovery |
| Theta | 4–8 | Deep meditation, the hypnagogic edge |
| Alpha | 8–13 | Relaxed focus, calm, flow |
| Beta | 13–30 | Alert focus, productivity |
| Gamma | ~40 | Peak cognition, insight |
A 200 Hz tone on the left and 207 Hz on the right produces a 7 Hz binaural beat — right at the theta/alpha border. Entrain lets you set both numbers, ramp them over time, and layer a noise bed underneath.
The band associations above describe general tendencies reported in peer-reviewed research, not guaranteed results — individual responses vary. Sources: Oster 1973, Chaieb et al. 2015, Garcia-Argibay et al. 2019, Jirakittayakorn & Wongsawat 2017. More on the support page.
For binaural beats, yes — each ear must receive a different tone. If you don't have headphones, use the isochronic presets (like "Unwind"), which pulse a single tone and work fine on a speaker.
For most people, yes — it's just sound. But Entrain is for relaxation, focus, and meditation support only. It is not a medical device and does not diagnose, treat, or cure any condition. Don't use it while driving or operating machinery. If you have epilepsy or a seizure disorder, are pregnant, or wear a pacemaker, talk to your doctor first.
Most apps hide the frequencies behind vague "sleep" and "focus" buttons. Entrain exposes the carrier and beat Hz, lets you build descent programs, offers isochronic and monaural modes, and synthesizes everything in real time — so sessions can be any length, work offline, and stay private.
A core set of sessions is free. A subscription unlocks the full library, custom builder, and longer programs. The web player above is free to try right now.