Sound Frequency Library

Solfeggio tones, brainwave binaural beats, and tuning frequencies — explained honestly, with in-browser audio so you can hear each one for yourself. No fabricated science, no healing claims. Just what is known and what is not.

Solfeggio Frequencies

Nine tones popularised in modern wellness culture as the "ancient Solfeggio scale." Each is associated with specific healing or transformation claims that are not supported by peer-reviewed science. What they do provide is a simple, pure tone at a specific pitch — which many people find calming.

174 Hz Pain Relief & Grounding The lowest Solfeggio tone. Pain-relief claims are not verified; a deep, steady pure tone you can hear here. 285 Hz Tissue & Restoration Associated with "healing tissue" claims that lack scientific support. Part of the modern Solfeggio set. 396 Hz Liberating Guilt & Fear The "Ut" tone. Associated with releasing guilt — not scientifically verified. Hear the pure sine. 417 Hz Undoing Situations Associated with facilitating change. A numerologically significant tone in the modern Solfeggio system. 528 Hz Love & DNA Repair The most famous Solfeggio tone. DNA-repair claims are pseudoscientific. The tone itself is audible here. 639 Hz Connecting & Relationships Associated with harmony and communication. Part of the set attributed to Joseph Puleo. 741 Hz Cleansing & Expression Associated with problem-solving and self-expression. The claims are numerological, not evidence-based. 852 Hz Intuition A higher Solfeggio tone tied to "intuition" claims with no scientific backing. Hear the pure sine. 963 Hz Awakening & Oneness The highest Solfeggio tone. "Pineal activation" claims are debunked — but it's a clear, bright tone.

Brainwave Binaural Beats

These pages cover the binaural-beat frequencies that correspond to the brain's major oscillatory bands — delta, theta, alpha, and gamma. Unlike Solfeggio tones, binaural beats have a documented mechanism (neural entrainment) and a growing, if preliminary, research literature. Headphones required to perceive the binaural effect.

2 Hz Delta — Deep Sleep The slowest brainwave band, dominant during slow-wave sleep. Delta binaural beat (carrier ~180 Hz). 6 Hz Theta — Drowsiness & Meditation Associated with light sleep, hypnagogic states, and deep relaxation. Theta binaural beat. 7.83 Hz Schumann Resonance Earth's real electromagnetic resonance, on the theta/alpha border. Presented here as a binaural beat — health claims are speculative. 10 Hz Alpha — Calm Wakefulness Dominant when relaxed with eyes closed. Alpha binaural beats are widely studied for stress reduction. 40 Hz Gamma — Focused Attention Associated with high cognitive engagement. 40 Hz has active research interest, including Alzheimer's work.

Tuning Frequencies

The standard concert pitch (A4 = 440 Hz) versus alternative tunings like 432 Hz. The difference is subtle — about 8 Hz — and claims that 432 Hz is more "natural" or healing lack scientific support, but the debate makes for interesting music-theory reading.

432 Hz 432 vs 440 Hz Tuning The alternative-tuning debate: historical context, the claims, and what acoustics research actually says.
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