What is blue noise?
Blue noise, sometimes called azure noise, is random noise whose power rises with frequency: by definition, about three decibels more for each octave up. White noise has the same power at every frequency, so next to it blue noise sounds thinner and brighter. It is the opposite of pink noise, whose power falls by the same amount per octave. The name follows the light analogy: light weighted toward short wavelengths looks blue.
What this page plays
This blue noise is made in your browser as it plays, so it needs no download and starts at once. It is a steady, bright hiss with very little low end, close to the sound of steam or a light spray.
Blue noise vs white noise
White noise spreads its energy evenly across the frequencies; blue noise tilts it toward the treble. Side by side, white noise sounds fuller and blue noise lighter and sharper. If white noise feels heavy to you, blue noise is a lighter choice; if it feels too sharp, try pink or brown noise instead.
How people use it
Some people play a steady noise quietly in the background while they work, read or wind down. Blue noise is one of the brighter choices, and many listeners prefer a softer color for long stretches. Try it at a low volume next to pink or brown noise and keep the one you like.
Listening at a comfortable level
Bright noise can seem louder than it is. Start with your device’s volume low, raise it only until the sound is comfortable, and take breaks from headphones. The volume control on this page isn’t a sound-level meter, so let your ears decide.
Benefits
- Plays in one tap, free, with no ads and no account
- Made in your browser, with nothing to download
- A lighter, brighter sound than white noise
- A timer under Play that fades it out or stops it at a set time
- Mix it with rain, a fan or another color in the full mixer
Common Uses
- A steady background sound while you work or read
- A quiet bedtime sound, if you like a bright hiss
- Comparing noise colors side by side
- A bright layer over a deeper sound in the full mixer
Frequently Asked Questions
What does blue noise sound like?
A bright, even hiss, thinner than white noise and close to the sound of steam or a light spray. It has very little bass.
Is blue noise good for sleep?
No noise color is proven to improve sleep. Some people like a steady sound at bedtime and others prefer quiet. If you try blue noise at night, keep it low and pick a timer under Play so it fades out.
What is the difference between blue noise and violet noise?
Both lean toward the treble. By definition, blue noise rises by about three decibels per octave and violet noise by about six, so violet noise is the thinner and sharper of the two on paper.
Is it free?
Yes. It plays in your browser for free, with no ads and no account needed, and it is made on your device as it plays, so there is nothing to download.
