White
0 dB / octave
Equal energy at every frequency. Because we hear in octaves, it sounds bright and hissy — the classic "TV static".
Tone generator.
Any pitch from 20 Hz to 20 kHz in sine, triangle, square or sawtooth, with the note name, plus a sweep across the whole range of hearing.
Now playing
Deep sleep
Generate a tone
Use the sliders to set the frequency and the shape, or tap a preset; tap again to pause. Start quiet: high tones and square waves get tiring fast.
A clean tone generator
The frequency slider moves on a musical scale, so every octave gets the same room, and the readout shows the nearest note and how many cents off it you are. Use it to tune an instrument, test speakers and headphones, find a rattle, or explore the edges of your hearing.
The shapes sound different because of their harmonics: a sine is a single frequency, a triangle adds soft odd harmonics, a square strong odd ones and a sawtooth every harmonic. The live picture shows the wave and its spectrum.
Good to know
- A at 440 Hz was agreed internationally in 1939 and became an ISO standard in 1955.
- Telephone tones are pure tones too: the dial tone is 425 Hz in much of Europe and 350 plus 440 Hz in North America.
- A 1 kHz tone is the usual reference in audio measurements, from microphones to sound level meters.
- Long, loud high tones can harm hearing: keep test tones quiet and short.
| Frequency | Note | Used for |
|---|---|---|
| 440 Hz | A4 | The standard tuning note |
| 1 kHz | About B5 | The classic audio test tone |
| 100 Hz | About G2 | Checking bass and hum |
| 10 kHz | About D♯9 | Checking treble and hearing |
How do I generate a specific frequency?
Drag the frequency slider: it moves on a musical scale, and the readout shows the exact frequency and the nearest note.
What is the best wave shape for testing?
A sine: it is a single frequency, so you hear only that pitch. Square and sawtooth add harmonics, which are useful for checking speakers rather than hearing.
Can I use it to tune an instrument?
Yes: set 440 Hz for A, or any note, and tune until the beats between the tone and your instrument disappear.
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.
Every fourth break is twice as long.
25:00Focus · 1 of 4
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
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.
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
Step 1 · Volume
Play the reference tone and set your volume so it's clear but comfortable. Leave it there.
Step 2 · Listen
8,000Hz
Your result
8k12k16k20k
A rough guide, not a diagnosis. Your phone, headphones and even this browser can cut the highest tones. Worried about your hearing? See an audiologist.
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.
200Hz
Your setup plays down to
Tone generator
Any pitch, 20 Hz – 20 kHz
Hz
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.
