A stargazing guide whose sky view widens as the phone unfolds
Does Sky Guide work on iPhone Duo?
Yes. Apple named Sky Guide among the apps optimized for iPhone Duo: open, edge-to-edge star maps fill the inner display, and version 13.1 added Duo support.
- Launch partnerNamed 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.
Adapted for the fold
- Open · Inner display
The sky edge to edge
Unfold the phone and the sky view widens into an edge-to-edge star map across the inner display, with Liquid Glass controls.
About Sky Guide
Sky Guide identifies stars, constellations, planets and satellites, with augmented-reality overlays, time controls and a calendar of sky events. It can alert you to passing satellites and works offline.
Apple named it in its October 22 roundup of apps for iPhone Duo: stargazers “can explore the night sky across the inner display” with “edge-to-edge star maps” and Liquid Glass controls. Version 13.1 widens the sky view as the phone unfolds, Fifth Star Labs says; neither mentions a half-folded layout.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· Official announcement reviewed
Launch partner · iphone-duo
Read Apple's Newsroom article of October 22, 2026, on apps for iPhone Duo. It says: "Stargazers can explore the night sky across the inner display of iPhone Duo with Sky Guide, which pairs edge-to-edge star maps with Liquid Glass controls"
Poses shown: Open. These are observations of the evidence, not a test of every interaction.
App version: Not recorded in this evidence.
An announcement from Apple, not a test: we haven't seen this layout running, and the article gives no app version.
View reviewed evidence ↗· App Store page reviewed
App Store confirmed · iphone-duo
The App Store release notes for version 13.1.1 (released October 21, 2026) mention iPhone Duo: "Minor bug fixes New in 13.1: + iPhone Duo Support Sky Guide is now optimized for iPhone Duo, beautifully expanding as you unfold the display for a broader, more immersive view of the universe."
App version: 13.1.1.
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 ↗· Developer statement reviewed
Developer claimed · iphone-duo
Read the release notes for version 13.1, which describe the sky view widening when the phone unfolds, and looked at ten iPhone and seven iPad pictures on the App Store. They show the app's usual iPhone and iPad screens.
App version: 13.1.
None of the pictures shows the app running on a Duo or the phone unfolding. No build was tested.
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?
Add the badge to your site or press kit. It links back to this page, where fans can upvote you.
<a href="https://foldhunt.com/apps/sky-guide/"><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: Developers bring incredible new app experiences to iPhone Duo — Apple Newsroom (apple.com) · Sky Guide on the App Store (apps.apple.com) · Sky Guide in Apple's app lookup (itunes.apple.com)
More for iPhone Duo
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
Pocket Greek Dictionary
Barry Brown
Ancient Greek word list on one side, the entry on the other when open
Simulator verified: The developer, Barry Brown, posted it on the iPhone Duo simulator and said the next version will be ready for the Duo, with a TestFlight beta that has wider screen support (@RezOtaku on X).
- Open