Frequently Asked Questions — Focus Audio
How does it generate sound without downloading files?
Web Audio API. Your browser's built-in synthesis engine generates all noise mathematically in real-time — no MP3s, no streaming. Runs entirely offline once the page loads. Your CPU calculates random waveforms through pink/brown noise algorithms, then passes them through filters and LFO modulators for each sound type.
What is the difference between white, pink, and brown noise?
White noise: equal energy at all frequencies — the classic static hiss, good for masking sharp sudden sounds. Pink noise: equal energy per octave — sounds like gentle rain, easier on the ears for long sessions. Brown noise: energy concentrated in the bass — deep and low like a distant waterfall. Most people find brown the most calming for sustained focus.
Can I layer multiple sounds at once?
Yes — all 9 sounds can run simultaneously. Each has its own independent volume slider. The active bar at the top of the Mixer shows what's currently playing and lets you stop individual sounds instantly. Use Presets to load curated combinations with one click.
Does ambient sound actually improve focus?
Research supports it. Moderate ambient noise (~70 dB) has been shown to increase creative cognition and mask distracting irregular sounds without being intrusive. The effect is especially pronounced for tasks requiring sustained attention. Brown and pink noise are most studied for focus and ADHD management.
What do the Presets do?
Presets are curated sound combinations optimised for specific contexts — Deep Work, Sleep, Flow State, etc. Loading a preset stops any currently active sounds and starts the preset mix at the specified volumes. You can then fine-tune individual sliders after loading.
Is this free?
Yes. One of
127 free tools at jasperbernaers.com. No ads, no tracking, no subscriptions — just sound.