A free tool · Acoustic physics studio
Synthesize infinite soundscapes in your browser
Pure mathematical synthesis in your browser, running continuously with zero looping artifacts, zero network streaming, and zero third-party ads. Blend calibrated colored noises with procedural rain, night wind, ocean swells, and mountain stream textures.
Nothing is streamed and nothing is uploaded. Every sample is generated directly on your device by Web Audio oscillators and filters, which is why it runs offline, costs nothing to use, and allows direct high-fidelity 16-bit stereo WAV export.
- Free
- No account
- 100% Client-side synthesis
- Zero streaming bandwidth
- 16-bit stereo WAV export
- Loop-free continuous audio
Three steps to shape your room
- Choose your acoustic baseStart from deep brown rumble, balanced pink noise, or full-spectrum white masking.
- Layer organic texturesBlend procedural rain droplets, sweeping wind, rolling tidal wash, or gentle stream water.
- Set a timer or exportRun continuous playback with a gentle 30-second fade-out, or download a seamless offline WAV file.
Brown Noise
Pink Noise
Green Noise
White Noise
Rain on Glass
Night Wind
Ocean Wash
Mountain Stream
Session timer
Choose a fixed duration or leave continuous. When a timer expires, playback ends with a gentle 30-second exponential fade-out rather than an abrupt cutoff.
Export offline WAV track
Rendered locally in your browser. Zero server upload, zero accounts, and zero storage.
The science of sound masking
Human hearing evolved to remain perpetually vigilant. Even during deep concentration or rest, the peripheral auditory system continuously monitors environmental acoustic variations.
The Orienting Reflex and Transient Noise
The human brain is not disrupted by steady sound; it is startled by delta — sudden shifts in acoustic amplitude or frequency. When an office door slams, a phone rings, or distinct speech penetrates a quiet room, the nervous system triggers an involuntary orienting reflex, shifting attention from internal thought to the environmental source.
Sound masking works by raising the ambient acoustic floor. By introducing a continuous, predictable broadband spectrum, the signal-to-noise ratio between background silence and unexpected domestic or office noises is dramatically flattened. Transient noises no longer breach the threshold required to trigger an involuntary attentional shift.
The Physics of Colored Noises
Brownian (Red) Noise
Named after Brownian motion rather than a color spectrum, brown noise is produced by integrating white noise over time. Each octave drop reduces spectral energy by 6 dB, resulting in a deep, rich low-frequency rumble that mimics distant thunder or low waterfalls without sharp high frequencies.
Pink Noise (1/f)
Pink noise carries equal energy per proportional octave band (e.g. 100–200 Hz has the exact same total energy as 10,000–20,000 Hz). Because human hearing perceives pitch logarithmically, pink noise sounds perceptually flat and balanced to the human ear across the entire audible spectrum.
Green Noise
Green noise is an informal term used in acoustic engineering to describe broadband noise with concentrated energy in the center-band around 500 Hz, rolling off both sub-bass rumble and harsh treble. It closely resembles the ambient sound of wind rustling through dense forest canopies.
White Noise
White noise contains equal power spectral density at every linear frequency interval. Because each higher octave contains twice as many hertz as the previous octave, white noise emphasizes higher frequencies to human hearing, making it the most aggressive tool for masking clear conversational speech.
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