A music box: open the Duo and the lid lifts and the ballerina dances; fold it and it stops
Does Lullabox work on iPhone Duo?
Yes, says its App Store page: on iPhone Duo the phone is the box, the hinge is its hinge, and the music follows as you open and close it.
- App Store confirmedIvo Junior Bettini, the developer, in a submission to FoldHunt on October 24, 2026. The App Store seller is Ivo Junior Bettini. Lullabox came out on October 22, 2026, and its App Store description has a section on iPhone Duo; the support page says the hinge is the lid.
Adapted for the fold
- Open · Inner display
Lid and box
Open it and the fold splits the screen into the lid, a mirror with a porcelain ballerina turning to the music, and the box, where the pinned brass cylinder plucks the comb.
- Book · Partly folded
Muffled as it closes
The melody is made as it plays and follows the hinge, so it grows muffled as you bring the lid down; fold it shut and it ends with a clack.
About Lullabox
Lullabox is a music box by Ivo Junior Bettini, made to feel like the real thing. Wind the brass key and the spring holds 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. On other iPhones you lift the lid with a finger.
On iPhone Duo the phone is the box. Closed, the cover is the lid; open it and the hinge becomes the hinge of the box, with the mirror standing up and the velvet floor lying flat. The music follows the hinge, growing muffled as the lid comes down, and folding the phone shut ends it with a clack.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· App Store page reviewed
App Store confirmed · iphone-duo
The App Store description mentions iPhone Duo: "DESIGNED FOR iPHONE DUO On iPhone Duo, the phone is the box." (version 1.0, released October 22, 2026).
App version: 1.0.
Store text only: we haven't seen the app running, and the store page doesn't show how each pose is used.
View reviewed evidence ↗
Related guides
iPhone Duo poses: closed, open, book, standing and Split View
A plain-language guide to the ways you will hold iPhone Duo, what the phone itself does in each, and the apps and ideas that make the most of them. For anyone buying one, and for anyone building for it.
The best iPhone Duo apps so far (October 2026)
The apps worth installing now that iPhone Duo is on sale, from the apps Apple named as launch partners to indie apps whose developers have shown a real iPhone Duo layout, picked for what they do when you open the phone.
Do your apps work on iPhone Duo? What happens before they're updated
Every iPhone app opens on iPhone Duo, but only updated ones fill the inner display. What an app looks like before its developer adapts it, how to tell which are ready, and which popular apps have said so.
Is this your app?
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<a href="https://foldhunt.com/apps/lullabox/"><img src="https://foldhunt.com/badges/featured-on-foldhunt.svg" alt="Featured on FoldHunt" width="220" height="54"></a>Need to update the listing? Email the editor.
Sources: Lullabox on the App Store (apps.apple.com) · Lullabox support (ivemberg.github.io)
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- Open