Design the frequency curve, not just the track.

1. 

   01

   Choose a journey

   Fourteen of them across sleep, meditation, relaxation and focus. Every card shows its own curve, so you can see where it takes you before you press play.

2. 

   02

   Listen as it moves

   The current beat frequency and its band, live, with the whole curve underneath. Drag along it to skip ahead or drop back.

3. 

   03

   Or build your own

   Set where you start, then chain steps. Each one glides to its own frequency over its own length, with its own background.

• A fixed recording you press play on.

  A curve you author, step by step, and can edit after you've heard it.

• One frequency for the whole track.

  A tone that glides continuously between steps, delta through gamma.

• One ambience baked into the file.

  Sixteen beds, assignable per step, or silence where you want the tone alone.

• δDelta

  0.5–4 Hz

  The slowest rhythm, dominant in dreamless deep sleep. The floor a night-time journey settles onto.

• θTheta

  4–8 Hz

  The drowsy edge between waking and sleep. Deep meditation and drifting, image-rich states tend to live here.

• αAlpha

  8–13 Hz

  The relaxed idle. Awake and unhurried, thinking loosened but not gone. The bridge between focus and drift.

• βBeta

  13–30 Hz

  Ordinary waking attention — analysing, deciding, holding a task in mind. Where most of the day is spent.

• γGamma

  30–40 Hz

  The fastest rhythm, associated with moments when attention snaps together and everything feels sharply bound.

Band boundaries are naming conventions and differ between sources; these are the ranges the app itself uses.

NoiseSynthesised, so they never loop.

• White · Flat, bright hiss
• Pink · Softer, weighted low
• Brown · Deep, rumbling floor

NatureNatural scenes, as long seamless loops.

• Rain · Steady rainfall on soft ground
• Ocean · Distant waves on a wide shore
• Wind · Air moving through open meadow
• Fire · A campfire burning low
• Night · Crickets under a summer moon
• Beach · Gentle waves on sand
• Storm · Shelter from distant thunder

MeditativePads, drones and bowls rather than places.

• Ethereal Spa · Wide, weightless pad
• Floating Resonance · Slow bowls, long tails
• Quiet Temple · Still air and low drone
• Warm Aura · Close, golden hum
• Stillness · Almost nothing, held
• Soft Harmonics · Gentle overtones drifting

• Plays with the screen off

  Lock the phone, put it face down, or switch to another app — the journey keeps going, with its own controls on the lock screen.

• Backdrop Mode

  Let a journey sit underneath whatever else is playing, so a tone can run beneath a podcast, a playlist or a guided meditation from another app.

• A different scene per step

  Open over rain, move to nothing but the tone, finish on pink noise. Every step carries its own background, or inherits the journey's.

• Scrub the curve mid-session

  Drag along the frequency curve in the player to skip ahead or drop back. The tone follows to wherever you land.

• Gentle DescentSleep30 min · rain
• Deep NightSleep45 min · ocean
• Rain on LeavesSleep10 min · rain
• Storm CocoonSleep10 min · storm
• Night MeadowSleep10 min · night
• Mind AwakeMeditate30 min · pink noise
• Deep PointMeditate40 min · tone only
• Fireside StillMeditate10 min · fire
• Cliff AirMeditate10 min · ocean
• Evening UnwindRelax15 min · fire
• Shoreline DriftRelax10 min · beach
• Deep WorkFocus25 min · tone only
• Flow RampFocus20 min · wind
• Pine ClarityFocus10 min · wind

What the tone actually is

Plain explanations of binaural beats and the brainwave bands, with the research reported as it stands rather than as anyone would like it.

• Binaural beats, explained without the hypeThe pillar explainer: the two tones, the perceived beat, and where the evidence currently stands.
• Binaural beats for sleep: what is known, and what is notThe sleep-specific page: common practices, the small body of sleep-lab evidence, and its limits.
• Binaural beats and headphonesWhy speakers cancel the effect, what to listen on, and how loud is too loud.
• Theta waves: the 4–8 Hz bandThe drowsy edge between waking and sleep, and the band most meditation journeys sit in.
• Delta waves: the 0.5–4 Hz bandThe slowest rhythm, dominant in dreamless deep sleep and the floor a night-time journey settles onto.
• A binaural beat generator you can hear in the browserSet the carrier and the beat, see the frequency each ear receives, and hear the result over headphones.