A monster lives in your Duo: eyes on the cover, teeth inside, and it chomps when you fold
Does ChompDuo work on iPhone Duo?
Duo support is out: ChompDuo came out on October 23, 2026. Closed, a monster's eyes look out from the cover; open, its mouth fills the inside, and the jaws follow the hinge.
- App Store confirmedBrian Corrieri of Vision First Studio, the developer, in a submission to FoldHunt on October 20, 2026, and in a post on X with a video on a rendered Duo (@Brian_Corrieri on X). The App Store description says the jaws follow the hinge and snapping the phone shut makes it chomp. Version 1.0.1 came out on October 23, 2026.
Adapted for the fold
- Closed · Outer display
Eyes on the cover
Closed, the monster's eyes stare back at you from the cover screen. Tap them and they jump.
- Open · Inner display
A mouth inside
Open, the inner display becomes the monster's mouth. Tap it to bite, or drag to squeeze it shut.
- Book · Partly folded
The jaws follow the hinge
Fold it a little and the teeth come together; snap it shut and it chomps, with a crunch and a thump you can feel.
About ChompDuo
ChompDuo puts a monster in your phone. Every monster has its own eyes, teeth, sounds and insides, and its face moves as you tilt the phone. There are six: Cartoon, with a big purple grin; Softie, with buck teeth and rosy cheeks; slimy Organic; Mimic, a treasure chest with gold inside; Classic, with a very human smile; and a lit jack-o’-lantern Pumpkin. Cartoon is free, and one purchase unlocks the other five, with no ads, subscription or account.
It’s made for the iPhone Duo: closed, the monster’s eyes look out from the cover; open, the inside becomes its mouth, and the jaws follow the hinge, chomping when you snap the phone shut. On any other iPhone with iOS 27, you tap the eyes twice and the mouth opens. ChompDuo came out on October 23, 2026, the Duo’s launch day.
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 1.0.1 (released October 23, 2026) mention iPhone Duo: "Close your iPhone Duo and a pair of silly eyes peeks out from the cover screen; tap them and they jump."
App version: 1.0.1.
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 ↗
On X
Meet ChompDuo. The monster that lives in your iPhone Duo. 🎃 Biting October 23. Eyes outside, teeth inside. Fold it and it chomps.
Related guides
iPhone Duo poses: closed, open, book, standing and Split View
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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.
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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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Sources: ChompDuo on the App Store (apps.apple.com) · ChompDuo website (chompduo.visionfirst.studio) · Brian Corrieri on X (x.com)
More for iPhone Duo
Netflix
Netflix, Inc.
Clips on the outer screen, cinema on the inner one, redesigned for iPhone Duo.
Launch partner: Named by Apple as an iPhone Duo launch partner.
- Closed
- Open
- Book
- Standing
Prime Video
Amazon
Amazon's streaming service: half folded, the video above and X-Ray below
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 10.154 (released October 27, 2026) don't mention the Duo.
- Book
- Open
KakaoPage
Kakao Entertainment
Comics, novels and books from Kakao, read like a book on 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 7.34.2 (released October 22, 2026) list "Compatible with iPhone Duo".
- Open