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417Hz
417 Hz is one steady tone and nothing else. It sounds like a clear mid-range hum, roughly a G sharp, the same in both ears, holding without change for as long as you leave it playing. No hiss behind it and nothing that moves. Ten seconds tells you whether a bare tone is what you wanted.
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, identical in both channels. That sounds obvious until you go looking, because plenty of sites selling this number hand you a wobbling synth pad instead. This one measures 417.0 Hz and stays there. It reads as an ordinary note, a fraction sharp of G sharp 4, rather than a whistle or a test tone.
One pitch also means one narrow slice of the spectrum, so this covers almost nothing. If you want a sound to blot out a noisy room, you want something broadband instead, such as generated brown noise.
Where the number comes from
The solfeggio set is a modern invention. Someone assembled it in the 1970s from a numerological reading of the Book of Numbers, not from any surviving musical tradition, and no clinical guideline or systematic review addresses these frequencies at all. That is not a mixed picture — the properties attached to 417 Hz have never been tested in a form anyone could check. People play these tones because they like the sound, which is an honest reason and enough of one.
Compare the pitch against the 396 Hz tone just below it and the 174 Hz tone more than an octave down, or browse everything on the sound library index. If a bare pitch feels too exposed, the 417 Hz and rain blend in the free sound mixer puts something moving underneath it.
Frequently asked questions
What note is 417 Hz?
Near enough a G sharp. Standard tuning puts G sharp 4 a shade lower, and most ears will simply hear a G sharp.
Does 417 Hz do anything to the body?
No claim of that kind is supported. No systematic review or clinical guideline addresses solfeggio frequencies, so there is nothing behind the properties traditionally attached to them.
Is this really a pure tone?
Yes. It measures 417.0 Hz with nothing else audible alongside it: no harmonics, no backing layer, no drift.
Do I need headphones?
No. Both channels carry the same signal, so speakers and headphones deliver the same thing.