Free Online Player
285 Hz
285 Hz is one steady tone, a single pitch between C♯4 and D4, with nothing layered over it and nothing moving underneath it. It is the middle of the three solfeggio tones on this site — brighter than 174 Hz, darker than 396 Hz. Suits anyone who wants a plain drone to work or meditate against.
Ready to play
Put this under rain or a fire, keep the blend you end up with, and play it through the night with your screen off. The Slo app does that on iOS, Android and Mac.
What 285 Hz sounds like
It's one tone at 285 Hz, the same in both ears, and it holds steady for as long as you leave it running. The pitch lands between C♯4 and D4, nearer C♯4, which is about where a held tone stops sounding distant and starts sounding like it's in the room with you. Played quietly it's a soft hum around the pitch of a speaking voice; turned up it gets hard to ignore, which is why most people end up lowering a pure tone. If you want to set the frequency yourself, the binaural beats generator has an adjustable tone; it needs headphones.
What the evidence actually shows
A search of the literature found no systematic review and no clinical guideline addressing solfeggio frequencies at all. This is an absence of evidence rather than a mixed picture: the healing properties attached to these numbers have never been tested at a level that would let anyone repeat them. Describe the tone by its pitch, listen if you enjoy it, and treat any page that promises more as making it up.
Hear the pitches either side of it on the 174 Hz tone and the 396 Hz tone, or see everything on the sound library index. To soften the tone, open the 285 Hz and pink noise blend in the free sound mixer, where a layer of soft hiss takes the edge off a pure pitch.
Frequently asked questions
What musical note is 285 Hz?
It falls between C♯4 and D4 in standard concert tuning, closer to C♯4. There is no note that lands exactly on 285 Hz.
Is there research supporting 285 Hz?
No. No systematic review or clinical guideline addresses solfeggio frequencies, so there is nothing to support the properties traditionally attached to them.
Why does a pure tone sound louder than noise?
A tone is all at one pitch, while noise is spread across every pitch at once, so the tone stands out sharply. Turning it down usually fixes that.
Does this player have a sleep timer?
Yes. Stop after 15, 30 or 60 minutes, choose all night, or leave the timer off.