Endless variation
Most sounds are synthesised in real time across 288 audio engines; the rest are built from real instrument and animal recordings, re-sequenced live rather than looped. Play for ten minutes or ten hours.
Ambient sound that keeps changing
Drift, sleep, focus — to sound that keeps unfolding.
Optophone blends 1,264 ambient sounds across 288 engines — procedural soundscapes plus real instrument and animal recordings. Endlessly varied, so it does not settle into a short repeating clip. Mix, save, share, and take it wherever you go.
Hear it now
Coming soon App Store
Coming soon Google Play
Free with optional premium · No login required · Procedural sounds play offline
- 1,264 sounds
- 288 audio engines
- 1,298 visualizers
- 110 ready-made scenes
- 10 languages
Watch it in action
A minute with the real app.
Start a scene, layer more sounds, set each level, tune the rain, run a visualizer playlist and change the colours, all in one take.
A screen recording of the app. The soundtrack is the app’s own sound engine playing the same mix, tap for tap.
Try it here
Layer the sounds. Let the visuals play.
Press play and build a mix: layer as many of these sounds as you like, set each one’s level, and watch a playlist of visualizers change on its own. The app does the same with 1,264 sounds and 1,298 visualizers.
Now playing Press play
Sounds layered 0
Sounds
Tap to add or remove. Each sound has its own level.
Visualizer playlist
Changes every 10 seconds. In the app, choose 10 seconds to 2 minutes, in order or shuffled.
Theme
These are 30-second clips recorded from the app’s own engine, so here they repeat. In the app, sounds are generated live and do not settle into a loop. All eight are in the free tier.
Made live, not looped
Your ear learns a loop. This is not a loop.
Procedural sounds are synthesised on your phone while you listen, and real recordings are re-sequenced live. Rain keeps finding new leaves, and ten hours of wind does not settle into a clip.
- 288 audio engines, running on your device
- Real instrument and animal recordings beside their synthesised twins
- Every sound has its own controls, from intensity to stereo width
Take the tour
Every screen, built for the dark.
Swipe through the app as it looks tonight.
What it does
Designed to sit alongside your day, not in front of it.
1,264 sounds in one app
Rain, forests, fire, oceans, wind, machines, instruments, vocal layers, and unusual ambiences — all in one place.
Sleep, focus, breathing
Built-in sleep timer with fade-out, focus timer for work sessions, and guided breathing for quiet moments. No subscription wall.
Mix your own
Combine any sounds, adjust each one’s level and character, name the mix, and save it. Share it as a link — recipients open it in one tap.
Siri & widgets
Trigger any mix with Siri, or start one straight from a Home Screen widget.
Works without an account
Open and play instantly. Anonymous use is the default; sign in only if you want to sync mixes across devices. Translated into 10 languages.
What makes it different
More than a loop player.
Four things that shape how it sounds:
It keeps changing
1,264 sounds across 288 engines. The audio is assembled as you listen, so ten hours of rain does not settle into a repeating clip.
Plays offline
The procedural engine synthesises on your device, so it never needs the network. Real-recording sounds download once, then play offline too.
1,298 generative visualizers
Pair any sound with any of 1,298 generative visualizers. They are clock-driven generative art rather than audio-reactive meters, and you can switch them off entirely.
No claims, no labels
For relaxation and entertainment only. No medical promises, no “healing frequencies” — just well-engineered audio.
FAQ
Common questions, plainly answered.
Is it free?
Yes — 35 sounds, 8 preset scenes and 10 visualizers are free forever, with no ads, no time limit and no account. Premium (a monthly or yearly subscription, or a one-time lifetime purchase) unlocks the full catalogue — all 1,264 sounds, all 110 scenes and all 1,298 visualizers.
Do I need an account?
No. The app works without sign-up from the first launch — no email, no password, no friction. You can optionally sign in with Apple or Google later to back up your mixes and sync them across devices.
Does it work offline?
Once anything you want to hear has downloaded, yes. Everything the procedural engine makes is synthesised on your device and needs no connection at all. The sounds built from real recordings download once on first use — until then they stay silent — and afterwards they play offline like the rest. Cloud sync needs connectivity; playback does not.
Why does it not loop?
A looped clip is something the ear catches quickly. Optophone runs everything through a live engine instead — procedural sounds synthesized moment by moment, and real instrument and animal recordings re-sequenced so they do not settle into a loop. The rain hits different leaves each second; the wind shapes a different gust each minute. The result is audio that keeps changing for as long as you keep it playing.
Coming soon to iPhone, iPad and Android.
Optophone is not in the App Store or Google Play yet. When it arrives it will be free to install, with no account needed to start — 35 sounds free forever with no ads, and Premium for the rest.
Coming soon App Store
Coming soon Google Play