A UX reference that opens like a book, the library on the left, the entry on the right
Does UX Field Guide work on iPhone Duo?
Yes. UX Field Guide's App Store page says it supports iPhone Duo, so the update is out. FoldHunt's editor hasn't seen it running yet.
- App Store confirmedThe App Store description, by the developer Dimitris Kontaris, has a section on opening the iPhone Duo like a book, and the release notes for version 1.1.1 (released October 9, 2026) describe changes for the Duo held open and upright or set down like a laptop. A promo image of the Duo is among the App Store screenshots.
Adapted for the fold
- Open · Inner display
Library on one page, entry on the other
Opened like a book, the library and a pillar's entries sit on the left page and the entry you are reading on the right, with a clear strip either side of the crease.
- Closed · Outer display
Carry on with the same entry
Closed, the cover keeps the entry you were reading and the related entries you followed, and the whole guide works as on any iPhone.
- Book · Partly folded
Pillars on the table
Set down part open like a laptop, the four pillars sit on the lower half resting on the table.
About UX Field Guide
UX Field Guide is an offline reference of design patterns, laws and principles, each with a plain explanation, a good and bad example and sometimes a demo. On the Duo it reads like a two-page book.
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 release notes for version 1.1.1 (released October 9, 2026) mention iPhone Duo: "This update makes UX Field Guide easier to use on iPhone Duo when you hold it open and upright, or open it like a laptop and set it down."
App version: 1.1.1.
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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More for iPhone Duo
Sky Guide
Fifth Star Labs LLC
A stargazing guide whose sky view widens as the phone unfolds
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 13.1 (released October 14, 2026) say Sky Guide is optimized for iPhone Duo and that the sky view widens as the phone unfolds.
- Open
DexFold
Hernan Rosario / IntraPixel
A talking Dex that folds like the real one, with a data screen when half-folded
Simulator verified: IntraPixel, the developer, in a submission to FoldHunt on October 18, 2026, with pictures of the closed and open layouts on the app's website (intrapixel.com). The App Store seller is Hernan Rosario. The App Store description describes the closed, open and half-folded layouts.
- Closed
- Open
- Book
Nihongo
Serpenti Sei Japan LLC
A Japanese dictionary that keeps the page you're reading beside the definitions
Simulator verified: Serpenti Sei Japan, the developer, in a submission to FoldHunt on October 9, 2026, saying the iPhone Duo update will be on the App Store in time for the October 23 launch, with a screen recording of it in the iPhone Duo simulator (screen.studio). The developer says the layout was also tried on a real iPhone Duo at a workshop at Apple's Japan headquarters. The App Store seller is Serpenti Sei Japan LLC (id 881697245). The release notes for version 1.36 (released October 19, 2026) say Nihongo adapts as you fold and unfold iPhone Duo, making the most of both displays.
- Open
- Book