Open the phone to raise a pop-up city from its book
Does Unfold Your City work on iPhone Duo?
Yes, the developer says so: closed, the outer screen shows a book cover; unfold the phone and the book opens with it, raising a paper city.
- App Store confirmedPietro Messineo, the developer, in the App Store description for version 1.0 (released October 15, 2026), which says that on iPhone Duo the phone is the book: closed, the outer screen shows the cover, and unfolding the phone opens the book with it. Other iPhones use a hinge at the bottom of the screen. The App Store pictures are promotional artwork.
Adapted for the fold
- Open · Inner display
Unfold to raise the city
Unfold the phone and the book opens with it. Open it slowly and every card stands up as paper would, or snap it open and the whole city springs up.
About Unfold Your City
Unfold Your City is a shelf of pop-up books, one for each of the world’s great cities. Open a book and the city rises out of the page: towers stand up, bridges reach across the river, and palace roofs lift into the sky, folded the way real paper pop-ups fold. Lay it flat and the day turns to dusk, the windows light up one by one, and the city comes alive. Barcelona is free, and London, New York and Seoul are the other starting books.
On iPhone Duo, the phone is the book. Closed, the outer screen shows the cover, and unfolding the phone opens the book with it.
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: "MADE FOR IPHONE DUO On iPhone Duo, the phone is the book." (version 1.0, released October 15, 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
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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More for iPhone Duo
NAVER SERIES
NAVER WEBTOON
Korean webtoons and web novels, to read on the larger display of the open Duo
Launch partner: Named by Apple in its Newsroom article of October 22, 2026, on apps optimized for iPhone Duo. The App Store release notes for version 26.102.0 (released October 22, 2026) don't mention the Duo.
- Open
Vertically Verse
Jihoon Suh
Bible reader in vertical text that opens into a right-bound book spread.
Simulator verified: Jihoon Suh, on the Vertically Verse iPhone Duo page (vertically.works), with captures from the Xcode 27.1 simulator. The App Store seller is Jihoon Suh.
- Closed
- Open
- Book
OperaLibre
Donovan Montoya
Audiobook player whose reader shows two facing pages on the open Duo
Simulator verified: Donovan Montoya, the developer, merged Duo support into the app's public code (github.com) and later crease fixes with Duo simulator screenshots of the reader (github.com); the changelog listed it for version 1.3.0. The App Store version, 1.3.1 (released October 19, 2026), does not mention the Duo in its release notes.
- Open
- Book