S.Q.W.Secrets of Quantum Waves
EN

Baby sleep · Android · No ads

Real lullabies
for the night

LQW is a sleep-sound app that plays lullabies live. There are no ready-made recordings or repeating loops: ney, kanun and strings are played on your phone the moment you listen.

Android 7.0+ · Start free · One-time "Unlock all" · No subscription · No ads

What's inside

Five sounds, one calm night

Lullaby

Familiar, public-domain lullabies: Brahms' Lullaby, Twinkle, Twinkle, Little Star, Suo Gân, Arrorró Mi Niño, Fais Dodo, Dandini Dandini Dastana and more, plus ancient melodies such as the Seikilos Epitaph and the Lullaby for a Son of Shulgi.

Hum

A deep, calm sound, with eleven tones from low to high.

Womb

A setting close to the sound inside the womb.

Pulse

A calm heartbeat.

Create

Composes a brand-new lullaby at every press. Three characters: Balanced, Calm, Lively.

Illustrated scenes

A warm design, bright by day and dark at night. Every lullaby has its own illustrated scene; when it plays, the same scene turns to night.

Designed for the night

No buttons to find in the dark

Swipe controls. Swipe up or down for volume, left or right to change the lullaby.

A gentle close. When the timer ends, the sound fades out on its own with a long, gentle close.

With the screen off, too. Keeps playing with the screen off; stop it from the notification.

Two-step stop. A single accidental tap won't cut the lullaby.

Safe listening

Low volume, device at a distance

We recommend placing the device at least 2 metres from the baby's sleep area and keeping the volume low (American Academy of Pediatrics, 2023 statement).

The optional Baby mode is off by default. When you turn it on, the volume is capped at 70% and high sounds are softened.

LQW is a sound and music app; it is not a medical product and makes no health claims.

Privacy and simplicity

No account, no ads, no trackers

Sounds are generated on your device; no internet needed to play.

No microphone, camera, location or contacts access.

The short notes you leave in the morning stay on your phone only.

The interface is available in 12 languages.

LQW privacy policy

Start free

One sound in every menu is free. A one-time "Unlock all" purchase opens every lullaby, every hum tone, every pulse tempo, all Create characters and long timers. No subscription.

Android 7.0+ · See the Google Play page for current details.