Scientifically crafted audio environments generated live in your browser. Rain, binaural beats, brown noise — perfectly blended, infinitely adjustable.
Every sound in Somnio is generated mathematically using the Web Audio API — no recordings, no loops, no compression artifacts. Pure, endless, perfect.
Bandpass-filtered noise with a wandering LFO that replicates the irregular patter of real rainfall. Masks sudden noise spikes perfectly.
Low-frequency weighted noise that sounds like a deep rumble or distant waterfall. Loved by people with ADHD for focus and rest.
ProThe 1/f spectrum — equal energy per octave — producing the most naturally soothing noise profile, clinically shown to improve sleep quality.
ProTwo slightly different tones delivered to each ear create a perceived beat that entrains brainwaves. Choose Delta (4Hz) for deepest sleep.
ProLow-pass filtered noise layered with a 60Hz motor oscillator. Recreates the beloved hum of an electric fan without the electricity bill.
ProA 0.08Hz wave LFO modulates the volume of filtered noise to simulate the slow, hypnotic rhythm of waves breaking on a shore.
ProRain with procedurally generated thunder booms every 5–20 seconds. Low-pass filtered rumbles that feel physical and grounding.
ProSawtooth crackle LFO modulates mid-band noise to recreate the irregular pops and hiss of burning wood. Intimate and warm.
ProEqual energy across all frequencies. The classic sleep aid — pure, flat, and effective at masking environmental noise at any hour.
No recordings. No servers. No privacy concerns. Every sound synthesised live on your device using the Web Audio API.
Grant microphone access and Somnio analyses your ambient noise level in real time, adjusting volume automatically so you're never too loud or too quiet.
Layer up to three soundscapes simultaneously with individual volume controls. Rain under binaural beats under brown noise — your perfect combination.
Set a timer from 15 minutes to 2 hours. A circular countdown ring visualises your remaining time, and volume gently fades in the final minute.
Install once, run forever. Somnio works entirely offline after the first load — no app store required, no background data, no battery drain from network calls.
Visit in Chrome on Android and tap "Add to Home Screen". Somnio installs as a native-feeling app in seconds — no Play Store, no waiting.
Pick one sound or mix up to three. Adjust individual volumes. Tap the orb to play — your selection is remembered for next time.
Optional: set a sleep timer so Somnio fades out and stops on its own. Enable adaptive volume and let the app respond to your room.
I've tried every sleep app. This is the first one that runs entirely in the browser, no permissions, no account. The brown noise is extraordinary.
The binaural beats with delta waves genuinely shifted something. I fall asleep about 30 minutes faster on nights I use this. The mix feature is brilliant.
The adaptive mic is the killer feature. I live near a busy street and it automatically turns up when traffic gets loud. Magical.
Two free sounds forever. Unlock everything for less than a coffee a month.
No download. No account. Open in Chrome and press play.