Golden Ratio · φ 1.618

Harmonic Resonance

396 Hz

Root · Muladhara

Tap to begin

Custom Hz

Harmonics

Use headphones for the binaural effect.

Brainwave beat7.8 Hz · Theta

440 drone

Pure-sine golden-ratio harmonics, generated live. iPhone: plays even with the ring switch on; use the side buttons for volume.
A sound tool — not a medical device.