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This generator plays a pure tone at any frequency you set, with one-tap presets for the nine solfeggio values: 174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz. Sound is synthesised in the browser through the Web Audio API — nothing is streamed or downloaded, so playback starts immediately and continues as long as you leave it running.
Start with a preset or type a frequency directly. Keep the volume low: sustained pure tones are more fatiguing than music at the same level, and a tone that seems comfortable in the first minute rarely still is in the tenth. Use headphones if you want the pitch clean, and stop if it becomes unpleasant.
Frequency Generator
Generate a precise pure tone for meditation, ritual focus, energetic contemplation, or symbolic attunement. Each collection keeps its own esoteric tradition instead of presenting different systems as one universal scale.
In modern Solfeggio practice, this tone is contemplated as a symbol of blessing, heart-centered renewal, love, and transformation.
Exact tone: the browser synthesizes the selected frequency as a sine wave in real time. Start at low volume; the symbolic correspondences support contemplation and ritual practice, not medical diagnosis or treatment.
How to use the frequency generator
- Pick a preset or set a frequency. The nine solfeggio tones are one tap away; any other value can be typed in.
- Set the volume before playing. Start low. A pure tone carries further than it seems and is easy to overdo.
- Play the tone. Playback is continuous until you stop it.
- Stop when it stops being comfortable. There is no benefit to pushing through discomfort, and no tradition that asks you to.
Where the solfeggio numbers come from
The six-tone solfeggio set — 396, 417, 528, 639, 741 and 852 Hz — was introduced in the 1970s by Joseph Puleo and popularised through his work with Leonard Horowitz in the 1990s, derived by applying a numerological reduction to a passage in the Book of Numbers. The three additional tones, 174, 285 and 963 Hz, were added later to complete a nine-tone scale.
This is a modern system, not an inheritance from medieval chant. The historical Guidonian syllables — ut, re, mi, fa, sol, la — name scale degrees rather than fixed frequencies in Hertz, and Hertz itself was not defined until the nineteenth century. Saying so does not diminish the practice; it just places it correctly. The claims attached to individual frequencies are traditional attributions within that modern system, not measured effects.
Using a tone in practice
A sustained tone works well as an object of attention, in the same way the breath does. Set a low volume, choose one frequency, and return to it whenever attention drifts. Ten minutes is plenty. The meditation timer pairs naturally with this if you want a fixed session length.
The vibration and frequency page covers the wider esoteric theory of sound, and the chakras are the centres these tones are most often matched to.
A note on safety
Keep the volume moderate and take breaks. Anyone with tinnitus, hyperacusis, a seizure disorder, or any hearing condition should be cautious with sustained tones and take medical advice rather than this page's. Nothing here treats anything.