Left Right Headphone Test & Stereo Phase Check

Mixes

One tap to start. Change anything and save it as your own.

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. Add rain or a drone underneath with Mix.

Fine-tune the rhythm and sound

Ready

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.

Sound while you work

Silence during breaks

25:00Focus · 1 of 4

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

Calm

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

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.

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?

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.

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.

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.

Why check left and right?

Earbuds are easy to swap by mistake, and some cables and adapters flip the channels. For music it barely matters; for 8D audio, binaural beats and stereo nature sounds it matters a lot.

The phase check plays the same noise in both ears, first in phase, then with one side flipped. In phase should sound solid and centered; out of phase should sound hollow and hard to place.

If in phase sounds hollow, one speaker or earpiece is wired backwards.

What does out of phase mean?

One side moves in while the other moves out. Low sounds partly cancel and the sound loses its center.

My left and right are swapped. What now?

Swap the earbuds, or check the adapter and your device's audio balance settings.

Can I test speakers too?

Yes, stand in the middle between them. The effect is clearest with headphones.

Questions

Does it work without internet?

Yes. After the first visit the whole app is stored on your device. Sounds are calculated live by your phone or computer, so nothing streams — you can play brown noise for ten hours in airplane mode.

Do the sounds loop?

No. Each one is built sample by sample from random numbers and filters, so it never repeats and has no seams. Ocean waves arrive at random, rain never plays the same drop twice. On iPhone, when the screen locks, playback switches to a long seamless recording of your exact mix, because iOS pauses live audio in the background.

Can I keep it playing with the screen off?

Yes, on Android, iPhone and computers. Start the sound, then lock your phone. Tip: install the app to your home screen for the most reliable background playback.

How loud should it be?

Quieter than you think: about the level of a soft conversation, or a little lower. Every sound here is loudness-matched, so switching between them won't make you jump.

Is the hearing test accurate?

It's a quick check of the highest pitch you can hear through your own device. Phones, headphones and browsers can cut the very top frequencies, so treat it as a fun estimate, not a diagnosis.

Do you collect any data?

Only anonymous counts — how many visits, which sounds get played, how many people finish the hearing test — so we know what to make next. No cookies, nothing that identifies you, nothing sold or shared, and it runs on our own server. If your browser sends "Do Not Track", nothing is counted at all.

Is it free?

Yes. No ads, no sign-up. If you like it, subscribe to the YouTube channel — new tests and 10-hour sounds every week.

Left & right test.