Traditional / experimental practice
Solfeggio 528 Hz · Pure Tone
A pure 528 Hz tone with very light pink noise. A frequency from the Solfeggio tradition; no scientific effect is claimed.
A traditional or spiritual practice, not a scientific claim.
How is it made?
- Pure tone · 528 Hz
- Pink noise
Sound is generated on this device in real time; no files are downloaded from a server. There is a 8 s fade-in at the start and a 1 min fade-out at the end.
Evidence
D · Insufficient evidenceNo clinical support; only laboratory findings, anecdotes or a single small study.
There is one small study and one biomarker trial; it has not been reliably shown that 528 Hz reduces stress.
Evidence level D: Insufficient evidence- What do we know?
- In a small 9-person study, salivary cortisol fell and tension scores decreased after 528 Hz music; randomization and blinding were not reported. In a randomized trial with 162 students in Türkiye, 528 Hz music raised salivary BDNF and CREB.
- What don't we know?
- What these biomarker changes mean for everyday stress is unclear; attention-test performance did not differ between groups in the same trial. The findings have not been independently replicated.
A modern spiritual interpretation; not a scientific claim.
Evidence level T: Traditional/spiritual practice- What do we know?
- Medieval solfège syllables (ut, re, mi…) are real music history. Today's list assigning Hz values to them is a modern spiritual interpretation, popularized by a non-peer-reviewed book published in 1999. Lists vary between sources: some count six tones, others nine.
- What don't we know?
- The meanings given to the tones have not been scientifically tested, and different sources assign different meanings.
A session's level is the weakest of its linked claims; it is never raised by a strong but unrelated claim.
Keep your device volume comfortable, preferably below 60%. You can also use your device's headphone-safety settings.