Sereni
iOS & iPadOS · Free · $1.99 removes ads
For sleep, study & focus
Five colors of quiet.
Sereni is the simplest way to fill a room with calming noise. Pick a color — White, Pink, Brown, Green, or Deep — set the sleep timer, and press play. Each sound loops seamlessly inside its own landscape, keeps playing with the screen locked, and stops on its own after you've drifted off.
Download on the App Store Free · a single $1.99 purchase removes the ad banner for good.
The whole app: one screen, one button.
-
01 · Play — one screen, one button
Built for the moment you can't think straight.
Sound apps keep turning into libraries — catalogs to browse, mixes to build, subscriptions to manage. Sereni goes the other way: five proven noise colors, one screen, one button. Open it, press play, put the phone down. At 2 a.m., that's the entire point.
-
1.
Pick a color
Five noises, from bright White to felt-more-than-heard Deep — each living in its own painted landscape.
-
2.
Set the timer
Dial any duration, to the minute, on a familiar wheel picker. Or don't — the loop is endless.
-
3.
Press play
One big glass button. When the timer runs out, Sereni pauses itself and lets the room stay quiet.
-
1.
-
02 · Hush — the five noise colors
Every color of noise carries you somewhere different.
“Noise color” is real acoustics — it describes how a sound's energy spreads across the frequency spectrum. Sereni tunes one sound for each color that matters, and gives every one of them a landscape to live in.
-
White Noise
The waterfall
Equal energy at every frequency — bright, steady, the classic masker of the outside world.
Thin walls · snoring · open offices
-
Pink Noise
The shoreline at dusk
Softer with every octave — like surf that never hurries.
Falling asleep · staying asleep
-
Brown Noise
The autumn forest
Deeper still — a low, rolling rumble with the high end worn away.
Racing thoughts · deep rest
-
Green Noise
The morning valley
The middle of the spectrum, where wind and water sit.
Reading · studying · deep work
-
Deep Noise
The midnight sea
The lowest of the five — more felt than heard.
When everything else is too bright
All five are generated, not recorded — endless, seamless loops with no splice to wake you.
-
-
03 · Drift — a timer that lets go
Set it for 0:45. Wake up to silence, not a song.
The sleep timer is a wheel picker, not a list of presets — dial exactly the minutes you want, up to a full day. It counts against the clock, not the app, so it stays accurate while the screen is locked and playback runs in the background. When it reaches zero, Sereni pauses itself and gets out of the way.
Play, pause, and skip live on the Lock Screen and in Control Center, so the phone can stay face-down where it belongs. And the whole app is built to be used half-asleep: soft haptics on every control, VoiceOver labels throughout, Dynamic Type all the way up.
-
04 · Quiet — privacy & price
Quiet in the other sense, too.
Sereni has no account, no analytics, and collects no data of any kind. All five sounds ship inside the app — about 18 MB, airplane-mode friendly. The one ad banner is non-personalized: every request is sent with npa=1, and the app never touches your advertising identifier. Rather not see it at all? A single $1.99 purchase — Sereni Plus — removes it for good, and the privacy policy stays this short either way.
Vitals
- Sounds
- 5 noise colors · bundled
- Data collected
- none
- Accounts
- none
- The one ad
- non-personalized · npa=1
- Remove ads
- $1.99 · once
- Sleep timer
- any length, to the minute
- Works offline
- yes
- Requires
- iOS / iPadOS 17+
Can I layer two sounds at once?
No — by design. Sereni plays one sound at a time. Mixing desks are for studios; at bedtime you want one good sound and one button. If you're torn, start with Pink.
Will it keep playing if I lock the phone or switch apps?
Yes. Playback continues in the background with full Lock Screen and Control Center controls, and the sleep timer keeps wall-clock time no matter what the screen is doing.
What exactly does the $1.99 buy?
It removes the ad banner permanently — a one-time purchase, not a subscription, with Restore Purchases for your other devices. Every sound and feature is free either way.
Does it need the internet?
No. All five sounds ship inside the app, so it works in airplane mode. The network is only used to fetch the ad banner — and only where consent allows.
Press play. Put the phone down.