A prank that fakes a cracked screen and sound effects when you fold the phone
Does Fold Crack work on iPhone Duo?
According to its developer, yes. FoldHunt's editor hasn't checked Fold Crack on iPhone Duo yet, so it's listed as a claim.
- Developer claimedThe developer, in the release notes for version 1.3 (released October 10, 2026): "iPhone Duo support! It's like this app was made for it!! Prank your friends by folding your phone and watching the screen crack and sound effects respond." There are no pictures of it on the Duo yet. The App Store seller is Rebecca Skinner (id 6807880115).
Adapted for the fold
We're waiting on details of exactly what Fold Crack changes for the fold. Are you the developer? Tell us.
About Fold Crack
Fold Crack is a prank app: it shows a fake lock screen with the date and time, and when you pick the phone up, or on the Duo when you fold it, the screen pretends to crack with a sound effect of your choice. Version 1.3 adds iPhone Duo support, the release notes say. There are no pictures of it on the Duo yet.
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
JoyJar
ReAlign Leadership LLC
A shared gratitude jar: open the Duo and the jar faces a joy from it, like a book
Simulator verified: ReAlign Leadership LLC, the developer, in a submission to FoldHunt on October 21, 2026, with a plain screen recording of the app on the iPhone Duo simulator (iOS 27.1) on YouTube and a page about the Duo layouts (joyjar.app). JoyJar is coming soon to the App Store and Google Play.
- Open
- Book
- Closed
- Split View
Penjo: Pencil Journal, Planner
Zafer ARICAN
A handwritten journal: today's page on one side of the fold, today's plans on the other
Simulator verified: Zafer ARICAN, the developer, in a submission to FoldHunt on October 20, 2026, with simulator screenshots and recordings on the Penjo site (penjoapp.com). The release notes for version 3.8 (released October 20, 2026) say Penjo is now optimized for iPhone Duo in every pose: open, the page uses Penjo's iPad layouts; in the book and seated poses it stays clear of the fold; fold it shut and the journal closes.
- Book
- Open
- Closed
- Standing
Megu: SI Closet & Planner
JA Technology Consulting LLC
A digital closet and AI stylist, with the piece you tap beside the grid when open
Simulator verified: Jake Antebi, the founder of Megu, in an email to FoldHunt on October 22, 2026, saying Duo support is live with a layout designed for the unfolded screen, and in a post on the Megu blog on October 19, 2026 saying the Duo layouts arrived in version 1.6. The press kit holds unframed captures of the app on the Duo's cover and open display, at the simulator's screen sizes. The App Store seller is JA Technology Consulting LLC. The release notes for version 1.8 (released October 22, 2026) say: "Improvements for iPhone Duo."
- Closed
- Open
- Book