Real-time 48 kHz audio synthesis, five brainwave presets and any frequency you like, with no setup and no signup. Put on stereo headphones and press play. Sessions here run up to twenty minutes; the mobile app removes the limit and adds the full preset library.
Audio fades out over the last few seconds rather than cutting off.
Move either slider to leave the presets and dial in your own. The carrier barely matters — the beat is what does the work.
Browser sessions cap at twenty minutes so this page stays free for everyone. The app runs as long as you like, works offline, and remembers your sessions across devices.
The mobile app adds 44 expert-tuned presets, 34 ambient sound beds, progressive wake-up alarms, offline synthesis, and unlimited session length. Free. Not sure which to use? Read the full web vs mobile app comparison — it covers the four-preset trial here against the forty-preset app library, feature by feature.
127 peer-reviewed studies on binaural beats and brainwave entrainment.
Professional 48 kHz audio generation — not pre-recorded MP3 loops.
No signup. No data collection. No tracking. Your privacy stays yours.
The full app runs with zero internet after download. Airplane-ready.