Free Web Sound & Frequency Tools
Interactive audio generators designed for sleep, focus, tinnitus relief, and relaxation — right in your browser.
Brown noise & noise colour generator
Brown, pink, green, and white noise with a tone warmth control and a sleep timer.
Sleep soundscape mixer
Layer noise, healing tones, rain, and ocean swell into one bedtime track you can share.
Tinnitus frequency matcher
Find the pitch of your ringing between 100 Hz and 16,000 Hz, then run notched sound therapy.
Binaural beats generator
Delta, theta, alpha, and 40 Hz gamma entrainment with an adjustable carrier frequency.
4-7-8 breathing timer
A guided breathing ring with soft chimes for 4-7-8, box, and 4-6 breathing.
Sleep cycle calculator
Bedtimes and alarms that land between 90-minute cycles, not in the middle of deep sleep.
Take the sounds off the browser tab
Momental brings 100+ soundscapes, offline playback, background listening, and custom timers to iPhone and Android.
Get MomentalHow to use these tools
- 1
Start with the problem, not the tool. A noisy room or a racing mind means the noise generator. Ringing ears means the frequency matcher. Thoughts that will not stop means the breathing timer.
- 2
Open the tool and press play. Nothing installs and nothing is uploaded. Every sound is synthesised live in your browser, so the first press of play is all the setup there is.
- 3
Adjust one setting at a time. Each tool lays its settings out as numbered steps. Work down them in order — sound first, then level, then timer — instead of changing several at once.
- 4
Set a sleep timer before you lie down. 45 to 90 minutes covers falling asleep and the first deep cycle. Leave the tab open — the tools hold your display awake while a sound is playing.
- 5
Move to the app when you want it offline. Browser tools stop when the tab closes. Momental keeps the same sounds playing in the background, offline, with the screen off.
What these tools are, and what they are not
Every generator here is built on the browser's Web Audio API. That means the sound is calculated on your device in real time rather than streamed, so there is no buffering, no account, no upload, and no limit on how long you play.
It also means playback lives inside the tab. Close it, lock a phone, or switch apps and the sound stops. For all-night use, a dedicated app that keeps playing with the screen off is the better tool.
None of this is medical advice. Sound and breathing help most people wind down, but persistent insomnia, one-sided tinnitus, or sudden changes in hearing belong with a doctor rather than a web page.