Solfeggio Frequency Generator
Play the nine solfeggio tones or any frequency you like as a pure sine wave or a soft pad, layer several at once, and let a timer fade them out when you're done. The sound is synthesized in your browser and you can save it as a WAV file.
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The descriptions show traditional associations from modern meditation culture, for information only. They are not scientifically proven and are not medical advice. Keep the volume comfortable.
How to use the Solfeggio Frequency Generator
- Pick one or more tones by clicking the frequency cards. 528 Hz is selected to start with.
- Add a custom frequency if you need one, for example 432 Hz, and press Add tone.
- Choose Pure sine or Soft pad, set the volume and the fade time.
- Press Play. You can add or remove tones while they play, and set each layer's volume in the mix list.
- Set a timer to fade out automatically, or press Download WAV to keep the mix as an audio file.
The nine solfeggio frequencies at a glance
| Frequency | Syllable | Nearest note (A4 = 440 Hz) | Wavelength in air | Commonly claimed association |
|---|---|---|---|---|
| 174 Hz | – | F3 −6 cents | 1.97 m | Grounding, calm |
| 285 Hz | – | C♯4 +48 cents | 1.20 m | "Restoration" |
| 396 Hz | Ut | G4 +18 cents | 0.87 m | Releasing fear and guilt |
| 417 Hz | Re | G♯4 +7 cents | 0.82 m | "Facilitating change" |
| 528 Hz | Mi | C5 +16 cents | 0.65 m | "Love frequency", transformation |
| 639 Hz | Fa | D♯5 +46 cents | 0.54 m | Connection, relationships |
| 741 Hz | Sol | F♯5 +2 cents | 0.46 m | Expression, clarity |
| 852 Hz | La | G♯5 +44 cents | 0.40 m | Intuition |
| 963 Hz | – | B5 −44 cents | 0.36 m | "Crown chakra", oneness |
Wavelength uses the speed of sound in air at about 20 °C (343 m/s): λ = 343 ÷ f. The nearest note is found with n = 69 + 12 × log2(f ÷ 440); one semitone is 100 cents. Several solfeggio tones fall almost exactly between two piano keys, which is why they can sound slightly "off" next to standard-tuned music.
Where the solfeggio numbers come from
The syllables Ut, Re, Mi, Fa, Sol and La come from Ut queant laxis, a medieval hymn that the monk Guido of Arezzo used around the year 1000 to teach singers the steps of the scale. The hymn names notes, not frequencies: absolute pitch standards such as A = 440 Hz did not exist until centuries later.
The specific numbers 396, 417, 528, 639, 741 and 852 Hz were derived in the late 20th century through a numerology-based reading of scripture and became popular through books and online recordings from the 1990s on. 174, 285 and 963 Hz were added later to make a set of nine. Because the frequencies are a modern invention, any health or spiritual claims attached to them belong to belief and personal experience, not to measured science.
Tips for listening
- Use headphones or good speakers for 174 and 285 Hz; small speakers lose much of the low end.
- Layer carefully. Two tones close together (for example 417 and 432 Hz) produce a slow "beating" at the difference frequency (15 Hz here), which some people find soothing and others distracting.
- Prefer the soft pad for long sessions. A pure sine is precise but can feel piercing after a while; the pad keeps the same pitch with a gentler tone.
- Set a timer with a long fade (5–10 seconds) so the sound ends smoothly if you use it while falling asleep.
- For beat-based tones with a different frequency in each ear, try the Binaural Beats Generator; for test tones, sweeps and other waveforms use the Tone Generator.
Frequently asked questions
What are the solfeggio frequencies?
They are a set of nine tones: 174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz. Six of them (396 to 852 Hz) are linked by their promoters to the syllables Ut, Re, Mi, Fa, Sol and La from the medieval hymn to St. John; 174, 285 and 963 Hz were added later to extend the set. The numbers themselves were popularized in the 1970s–1990s and are not a historical musical tuning.
Do solfeggio frequencies have proven healing effects?
No. Claims that particular frequencies repair DNA, cleanse energy or cure illnesses are not supported by scientific evidence. Many people simply enjoy a steady tone as a calm background for meditation, relaxation or focus. This tool is for listening only and is not a medical device or treatment.
What is the difference between Pure sine and Soft pad?
Pure sine plays only the exact frequency with no overtones, which is what most solfeggio recordings use. Soft pad keeps the same fundamental frequency but adds a quiet octave, two slightly detuned layers and a gentle swell, so it sounds warmer and less piercing over long sessions.
Can I play 432 Hz or another frequency?
Yes. Type any value from 20 to 20,000 Hz in the custom frequency box (decimals allowed) or use the 432 Hz and 440 Hz shortcuts, then press Add tone. Custom tones can be layered with the solfeggio set.
Why can't I hear 174 Hz on my phone?
Small phone and laptop speakers reproduce low frequencies poorly, so 174 Hz and especially tones under 150 Hz may sound faint. Headphones or larger speakers give a much fuller result. Very high custom tones above about 15,000 Hz may also be inaudible, especially for adults.
How loud should I play the tones?
Keep it comfortable and quiet. A pure tone can feel louder than music at the same level, especially with headphones. Start with the device volume low, raise it slowly, and take breaks during long sessions.
Does the timer keep working with the screen off?
The tone and timer run while the browser tab stays open. Some phones pause web audio when the screen locks or the tab goes to the background; if that happens, keep the screen on or download the mix as a WAV file and play it in your music app.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.