A CD player whose jewel case opens as the Duo unfolds, with a five-disc changer inside
Does Penta - CD Player & Changer work on iPhone Duo?
Duo support is announced, not out yet: John Seubert, who makes Penta, showed a Duo version in a simulator video on X and says it is coming soon.
- Developer claimedJohn Seubert, who makes Penta, in a post on X with a video from Bitrig's Duo simulator (@seubjoh on X): "Penta is already on the App Store. Duo support coming soon!" The App Store seller is John Seubert (id 6806427066). Version 1.2 (released October 8, 2026) does not mention the Duo, and neither does the description.
Adapted for the fold
- Closed · Outer display
A shelf of albums on the cover
Closed, the cover shows one album at a time on a shelf you flick through, sideways or upright, with a prompt to open the phone to open the case.
- Open · Inner display
Jewel case, then a five-disc changer
Unfolding opens the album's jewel case, with the tracklist on the left and the disc on the right. Open flat, the deck shows its lit display on the left and the five-disc carousel on the right; turned upright, two albums sit above the display.
- Book · Partly folded
Albums on top, carousel below
Half-folded like a laptop, two albums from your library sit on the upper half, and you drag their discs down into the five-disc carousel on the lower half, above the transport keys.
About Penta - CD Player & Changer
Penta plays the albums in your music library as if they were CDs in a five-disc changer. John Seubert is building a Duo version where unfolding the phone opens the jewel case and the open screen becomes the changer, with albums above the fold and the carousel below it when half-folded.
On the ideas wall
All ideas
Building a 5-disc CD changer for iPhone Duo 💿 Unfold the phone and the jewel case opens. Then load the disc into the carousel. Penta is already on the App Store. Duo support coming soon! Demoed on @bitrig, which has the best Duo simulator!
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 on day one, from Apple's four 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.
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Sources: John Seubert on X (x.com)
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- Closed
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