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528Hz
528 Hz is a single steady tone, the same in both ears, holding without change for as long as you play it. What you hear is a clear note a touch above C, with nothing behind it. This is the most heavily marketed number in the solfeggio set and the one carrying the largest claims, so the short version first: the file is a clean tone at exactly the frequency in its name, and nothing more.
Ready to play
Stack this under rain or a fire, keep the blend, and play it with your screen off. Slo, on iOS, Android and Mac.
What the file actually contains
One pitch, no harmonics, no backing layer, no drift. Standard tuning puts C5 a fraction lower, so this sits a sixth of a semitone sharp of it, and there is arithmetic behind that. Tune a piano to A equals 444 Hz instead of the usual 440 and C5 lands on 528 Hz exactly, which is where the claim that 528 Hz is a natural tuning comes from. It is a true fact about a slightly raised reference pitch, and it says nothing about anyone who listens to it.
The DNA repair claim
This tone is sold as the love frequency and as a way of repairing DNA. The DNA story traces to a popular book from 1998, not to any published experiment, and no systematic review or clinical guideline addresses solfeggio frequencies. Nothing has been shown because nothing has been tested in a form that could be checked. Any page promising more is making it up.
The neighbouring pitches are on the 396 Hz tone and the 285 Hz tone, and the full catalogue is on the sound library index. A pure pitch sits more easily with a broadband layer beneath it, so try the 528 Hz and pink noise blend in the free sound mixer.
Frequently asked questions
Does 528 Hz repair DNA?
No. That claim comes from a 1998 popular book rather than a published experiment, and no clinical guideline or systematic review supports it.
Why is 528 Hz called a natural tuning?
Because tuning a scale to A equals 444 Hz rather than 440 puts C5 at exactly 528 Hz. That is arithmetic about a reference pitch, nothing more.
What note is 528 Hz?
A sixth of a semitone above C5, close enough that most ears will hear it as a C.
Is the file a real 528 Hz tone?
Yes, and that is worth checking elsewhere too. The pitch measures 528.0 Hz with nothing else audible alongside it.