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Tap any frequency to hear it as a pure tone or a soft drone. Below: where the numbers come from, and an honest look at the claims.
The table lists each tone with the association it is usually claimed to have. Those meanings come from solfeggio books and playlists, not from research — see the evidence section below.
| Frequency | Syllable | Traditional association (claimed) | Nearest note | Set |
|---|---|---|---|---|
| 174 Hz | — | Promoted as a "natural anaesthetic" for pain and as a grounding, foundational tone | F3 −6 cents | Extended set (later addition) |
| 285 Hz | — | Promoted as a frequency for "tissue regeneration" and restoring the body's "energy field" | C#4 +48 cents | Extended set (later addition) |
| 396 Hz | Ut | Promoted as "liberating guilt and fear"; often mapped to the root chakra | G4 +18 cents | Original six (Puleo) |
| 417 Hz | Re | Promoted as "undoing situations and facilitating change"; often mapped to the sacral chakra | G#4 +7 cents | Original six (Puleo) |
| 528 Hz | Mi | Promoted as the "love frequency" and the "miracle tone", with claims of "DNA repair" | C5 +16 cents | Original six (Puleo) |
| 639 Hz | Fa | Promoted as "connecting and harmonising relationships"; often mapped to the heart chakra | D#5 +46 cents | Original six (Puleo) |
| 741 Hz | Sol | Promoted for "expression and solutions" and "cleansing"; often mapped to the throat chakra | F#5 +2 cents | Original six (Puleo) |
| 852 Hz | La | Promoted as "returning to spiritual order" and "awakening intuition"; often mapped to the third eye | G#5 +44 cents | Original six (Puleo) |
| 963 Hz | — (sometimes "Si") | Promoted as the "crown chakra" or "pineal gland activation" tone and a "frequency of oneness" | B5 −44 cents | Extended set (later addition) |
Not on the list but often grouped with it: 432 Hz, which comes from the A=432 tuning movement rather than the solfeggio scale.
The syllables are medieval. Around 1025, the music teacher Guido of Arezzo taught singers to find notes using the hymn Ut queant laxis, whose six lines each start one step higher: Ut, Re, Mi, Fa, Sol, La. This is the origin of do-re-mi. It described steps of a scale, not fixed pitches — there was no such thing as a frequency standard in Hertz until many centuries later.
The numbers are modern. In the 1970s, the naturopath Joseph Puleo said he had found six frequencies encoded in the Book of Numbers using digit-reduction numerology. Leonard Horowitz popularised them in the 1999 book Healing Codes for the Biological Apocalypse, pairing each with a syllable and a phrase from the hymn: 396 (Ut), 417 (Re), 528 (Mi), 639 (Fa), 741 (Sol) and 852 (La).
The set grew later. 174, 285 and 963 Hz were added afterwards to make the nine-tone version common on YouTube and streaming services, and chakra charts pairing each frequency with an energy centre came later still. These pairings are a modern Western invention, not part of traditional yoga texts.
Add the digits of any solfeggio frequency until one digit remains and you always get 3, 6 or 9 — for example 528 → 5+2+8 = 15 → 1+5 = 6. Promoters present this as meaningful. It is a direct result of how the numbers were chosen (by that same digit arithmetic), and digit sums depend on writing numbers in base 10 and measuring time in seconds, both human conventions. It is a fun pattern, not evidence.
There is no good evidence for the specific claims attached to these tones — DNA repair (528 Hz), detox (741 Hz), pineal activation (963 Hz), pain relief (174 Hz) or chakra effects. They have not been tested in rigorous trials, and several make no physical sense.
A small number of studies have looked at music tuned to particular frequencies: a very small 2018 study of 528 Hz-tuned music and a 2019 pilot comparing 432 Hz and 440 Hz tuning reported modest relaxation-type differences. Both were small, neither has been replicated at scale, and neither tested the claims above.
What is well established is simpler: steady, gentle sound you enjoy can help you relax and settle your attention. Use these tones for meditation, relaxation, sound exploration or curiosity — not as a substitute for medical care.
A set of nine tones — 174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz — promoted since the 1990s as having specific healing or spiritual effects. The core six (396–852 Hz) were described by Joseph Puleo in the 1970s and popularised by Leonard Horowitz.
Only the syllable names do. Ut, Re, Mi, Fa, Sol and La come from an 11th-century teaching method based on the hymn Ut queant laxis, which named relative scale steps, not frequencies in Hertz. The Hertz values were assigned in the late 20th century.
Not for the specific claims such as DNA repair, detox or chakra activation. A handful of small studies have looked at music tuned to 528 Hz or 432 Hz and reported modest relaxation-type differences, but they are small and unreplicated.
Because they were chosen using digit-reduction numerology, where you add a number's digits until one digit remains. That pattern is a feature of how the numbers were picked, not evidence of a hidden property.
There is no evidence any of them improves sleep. If you want a tone at bedtime, lower frequencies such as 174 Hz or 285 Hz as a soft drone at low volume, with the sleep timer on, tend to be the least intrusive.