Solfeggio Frequencies — all nine, 174 to 963 Hz

Listen to all nine

Tap a frequency to play it, and again to pause. “All nine in a row” walks from 174 up to 963 Hz and back, five seconds each.

About the Solfeggio frequencies

The Solfeggio frequencies are nine tones: 174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz. The six in the middle were popularised in the 1990s by Leonard Horowitz, who credits Joseph Puleo with finding them; three more were added later.

They take their name from the medieval do-re-mi syllables, but medieval singers had no fixed pitch in hertz, so the link is a modern story. Each tone is said to do something; none of these effects has been shown in controlled studies. Enjoy them as calm, steady tones.

Facts that often get mixed up

The nine numbers are not medieval: the core six appeared in books by Horowitz and Puleo in the 1990s.
The digits of each add up to 3, 6 or 9 (for 528: 5 + 2 + 8 = 15, and 1 + 5 = 6). That is numerology, not acoustics.
Four of them, 285, 639, 852 and 963 Hz, fall almost half-way between two piano keys, so they fit no standard scale.
No controlled study shows that any of them heals; the only research on 528 Hz is one tiny experiment.

	Nearest note (A = 440 Hz)	Commonly claimed
174 Hz	F3, 6 cents flat	Easing pain, grounding
285 Hz	Half-way between C♯4 and D4	Healing tissue
396 Hz	G4, 18 cents sharp	Releasing guilt and fear
417 Hz	G♯4, 7 cents sharp	Undoing situations, helping change
528 Hz	C5, 16 cents sharp	Love, transformation, “DNA repair”
639 Hz	Half-way between D♯5 and E5	Relationships, connection
741 Hz	F♯5, 2 cents sharp	Expression, solving problems
852 Hz	Half-way between G♯5 and A5	Intuition, spiritual order
963 Hz	Half-way between A♯5 and B5	“Oneness”, “pineal gland activation”

How many Solfeggio frequencies are there?

Nine are usually listed: 174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz. Older lists have only the six from 396 to 852 Hz.

Which one is best?

None is better for your health; pick the one you find most pleasant. The low ones sound softer, and the high ones, like 852 and 963 Hz, tire the ears sooner, so keep them quiet.

Do Solfeggio frequencies work?

As relaxing background tones they help some people settle. As medicine, no: their claimed effects have not been shown in studies.

Mixes

Pick what you need. One tap to start, change anything and save it as your own.

Focus timer

Work in waves.

The Pomodoro rhythm: focus with calm sound in your ears, then take a real break. A soft bell marks every change, so you never watch the clock. Every fourth break is a long one.

25:00Focus · 1 of 4

Silence during breaks

Sound while you work

Breathe

Slow your breathing down.

Follow the circle and the sound: it rises as you breathe in and falls as you breathe out. Choose a rhythm, or set your own, and pick what plays underneath.

Ready

Sound while you breathe

Noise generator

Any color of noise, from deep brown to bright violet — and everything in between.

Brown noise

Noise volume

Spectrum · 20 Hz – 20 kHz

Sound science

The colors of noise

Same randomness, different tilt. Each color shifts energy between low and high pitches — here is what that sounds like.

White

0 dB / octave

Equal energy at every frequency. Because we hear in octaves, it sounds bright and hissy — the classic "TV static".

Pink

−3 dB / octave

Equal energy in every octave, so it sounds even to the ear. Steady rain, rustling leaves. A favorite for focus.

Brown

−6 dB / octave

Deep and warm, like a distant waterfall or a plane cabin. Masks voices and traffic without any hiss.

Grey

Equal-loudness curve

Shaped around how our hearing works, so every pitch seems equally loud. Balanced and soft.

Blue

+3 dB / octave

The mirror of pink: more treble than bass. Airy, crisp, like a light spray.

Violet

+6 dB / octave

Mostly treble, like hissing water. Sometimes used to mask high-pitched ringing.

Calm

Gentle tones to settle into: singing bowls, a slow warm drone, wind chimes tuned so every note fits.

Frequencies

Famous tones on pages of their own: hear them side by side, with honest facts.

Sound phenomena

How sound bends, shifts, rings and fools the ear, and why space is silent: hear it for yourself.

Nature

Rooms & travel

Animals & countryside

A purring cat, whales and dolphins, a nightingale in the dark, cowbells on a summer pasture. Wonderful in stereo.

For babies

Womb sounds are what a baby heard for nine months: a deep rush of blood flow, and the heartbeat.

Hearing and speaker tests

Check your ears, headphones and speakers, each test on a page of its own with a live picture.

Ear Age · 60 seconds

Test your ears.

Our ears lose the highest pitches first, and it starts early. Find the highest tone you can still hear and see the typical age for it.

Headphones on, quiet room
Set a comfortable volume on the 1 kHz tone
Don't turn it up when a tone disappears — that's the point

20,000Hz

Can you still hear it?

Hearing age test →

More ear tests

Check your headphones, find the deepest bass your setup can play, or play any pitch you like.

Headphones check

Left & right

Each ear should get its own side. It matters for 8D, binaural beats and every stereo sound here.

Headphones on, then tap a side.

Bass test

How low can you go?

Deep tones from 200 Hz down to 20 Hz, the bottom of human hearing. Mostly it tests your speakers or headphones.

Tone generator

Any pitch, 20 Hz – 20 kHz

Hz

Tone volume

Start quiet: high tones and square waves get tiring fast.

Take it to bed

An app without the app store.

Add Ears & Waves to your home screen and it opens like any app — full screen, with its own icon. Everything it needs is saved on your device, so it keeps playing on a plane, in a tent or with Wi-Fi off.

Preparing offline mode…

Works offlineNo streaming. Sound is computed on your device, forever.
Screen offKeeps playing with the phone locked. The timer fades it out gently.
PrivateNo account, no ads, no cookies. Your mixes stay on your device.

Solfeggio frequencies.