White Noise Frequency Test: Find the Right Sound to Help You Sleep

A lot of people use white noise to fall asleep. But white noise isn't one sound — there are pink noise, brown noise, and others, and they sound very different. Some people find white noise too harsh. Others find brown noise too muffled. The only way to know what works is to test them yourself.

This tool lets you generate different noise colors and adjust the frequency range. You can test pink noise vs white noise side by side. You can also try low-pass filtering to remove high frequencies, which some people find more comfortable for sleeping.

What is white noise?

White noise is random sound with equal energy at every frequency. It sounds like a hiss — similar to TV static or a fan. The name comes from an analogy to white light, which contains all visible wavelengths.

In practice, white noise sounds brighter and sharper than you might expect. The equal energy at all frequencies means high frequencies are just as loud as low ones. For sleeping, many people find this too harsh.

What is pink noise?

Pink noise has equal energy per octave, not per frequency. This means lower frequencies are louder relative to higher ones. It sounds deeper and more balanced than white noise.

Studies have found that pink noise may help with deep sleep. A 2012 study in the Journal of Theoretical Biology found that pink noise increased stable sleep time by about 23% compared to no noise. A 2017 study in Frontiers in Human Neuroscience found that pink noise synchronized with brain waves improved memory during sleep.

Examples of pink noise: rainfall, wind through trees, rustling leaves.

What is brown noise?

Brown noise (also called brownian noise) has even more energy at lower frequencies than pink noise. It sounds like a deep rumble — similar to a waterfall, heavy rain, or a thunderstorm.

Brown noise has become popular recently, especially on TikTok, where people claim it helps with focus and ADHD. There isn't strong scientific evidence for this claim specifically, but many people do find the deep, consistent sound less distracting than other noise types.

How to use this test

Step 1: Choose a noise color (white, pink, or brown).

Step 2: Adjust the volume to a comfortable level.

Step 3: Use the frequency slider to cut high frequencies. For sleeping, try cutting everything above 500-1000 Hz.

Step 4: Listen for 5 minutes. If the sound is annoying, try a different noise color.

Step 5: Save the settings you like best.

Common noise frequencies for different uses

• Sleep: Pink or brown noise, 100-800 Hz range
• Focus/Work: White or pink noise, full range
• Tinnitus masking: Depends on your tinnitus frequency — match it
• Baby sleep: White noise around 50-60 dB (not too loud)
• Studying: Brown noise, moderate volume

White noise vs pink noise vs brown noise: which is better?

There's no single "best" noise. It depends on what you're using it for:

• White noise is good for masking sudden sounds (dogs barking, traffic)
• Pink noise is generally more pleasant for long listening
• Brown noise is good for deep relaxation and sleep

Most sleep apps offer all three. The problem is they don't let you adjust the frequency range, which makes a big difference.

Is white noise safe?

For most people, yes. The main concerns:

• Volume: Keep it below 50-60 dB for sleeping. Too loud can damage hearing over time.
• Babies: The American Academy of Pediatrics recommends keeping white noise machines at least 200 feet from a baby's crib and below 50 dB.
• Tinnitus: For some people, continuous noise can make tinnitus worse. If this happens, try lower volumes or different frequencies.

Frequently Asked Questions

What is the difference between white noise and pink noise?

White noise has equal energy at all frequencies. Pink noise has equal energy per octave, which means lower frequencies are louder. White noise sounds like a hiss. Pink noise sounds deeper, more like steady rain.

Which noise color is best for sleeping?

Most people find pink or brown noise more comfortable for sleeping than white noise. Brown noise is the deepest and has the least high-frequency content. Try each one for a few nights to see what works for you.

Can I use white noise every night?

Yes, most people can use white noise nightly without problems. Keep the volume below 50-60 dB. If you notice your tinnitus getting worse, try reducing the volume or switching to a different noise color.

What frequency should I use for white noise sleep?

There's no single best frequency. Try starting with pink noise and filtering out frequencies above 1000 Hz. If that's too muffled, try 2000 Hz. If it's too bright, try 500 Hz.

Does brown noise help with ADHD?

Some people report that brown noise helps them focus, but there's no strong scientific evidence for this. A small 2022 study found that brown noise improved performance on cognitive tasks, but the sample size was very small. Try it and see if it helps you.