The Lullabox music box app uses the hinge of the iPhone Duo as the hinge of the box, so opening the phone stands the mirror up and lays the velvet floor flat. The further you open the phone, the clearer the music gets, and closing the phone fades the music before the lid clacks shut.
Lullabox does not need an iPhone Duo to work, since on any iPhone you lift the lid with a finger or a tap and the screen becomes the box.
The Lullabox music box app uses the outer display as its lid
You wind the brass key and the spring stores about a minute and a half of music. Lift the walnut lid and a porcelain ballerina rises in front of the mirror and turns while the cylinder plays.
As the spring runs down, the music slows, just as it does on a real music box. Let the lid fall and it shuts with a clack. The brass, walnut and velvet make Lullabox one of the skeuomorphic iPhone Duo apps.
How the iPhone Duo hinge plays the box
- Closed, the outer display is the lid
- Opening the phone stands the mirror up and lays the velvet floor flat
- The further you open it, the clearer the music gets
- Closing the phone fades the music, and then the lid clacks shut
Lullabox plays four public-domain melodies
The music is synthesized in real time, so it follows the spring and the lid as they move. You can watch the pins on the cylinder pluck the comb. The four melodies are in the public domain and include Brahms’s Lullaby and Für Elise.
The October 31 update made the sound follow the lid more smoothly as you open and close it. With the lid shut, your iPhone can now sleep as usual, so no lit screen stays on the nightstand, and the app uses less battery while the box is closed.
Lullabox is free and collects no data
On an iPhone without a hinge, you lift the lid with your finger or tap it and it swings open in 3D. To shut it, you let it fall or turn the phone face down.
The app has no account, no ads and collects no data, and it runs on iOS 26.0 or later.
Download Lullabox from the App Store
