An accordion you play by opening and closing the Duo
Does DuoBox: Fold Accordion work on iPhone Duo?
Yes, the developer says so: DuoBox's App Store description says opening and closing the Duo works the accordion's bellows, with bass and treble on either side.
- App Store confirmedThe developer, in the App Store description: opening and closing the Duo works the bellows, with bass on one side and treble on the other. The App Store version is 1.0.1, released October 12, 2026.
Adapted for the fold
We're waiting on details of exactly what DuoBox: Fold Accordion changes for the fold. Are you the developer? Tell us.
About DuoBox: Fold Accordion
DuoBox is an accordion with recording tools. One hand plays the bass and the other the treble, and opening or closing the iPhone Duo pumps the bellows, the App Store description says.
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 description mentions iPhone Duo: "DuoBox turns iPhone Duo into an accordion." (version 1.0.1, released October 12, 2026).
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 ↗
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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<a href="https://foldhunt.com/apps/duobox/"><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: DuoBox: Fold Accordion on the App Store (apps.apple.com) · DuoBox in Apple's App Store lookup (itunes.apple.com)
More for iPhone Duo
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Launch partner: Named by Apple in its Newsroom article of October 22, 2026, on apps optimized for iPhone Duo, with more room for two decks, audio effects and stem separation. MWM, the developer, describes the layouts on the edjing Mix iPhone Duo page and in a submission to FoldHunt on October 24, 2026. The App Store seller is MWM. The release notes for version 9.4.1 (released October 25, 2026) don't mention the Duo, and the Duo page's pictures are interface previews with placeholder track names.
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Launch partner: Named by Apple in its Newsroom article of October 22, 2026, on apps optimized for iPhone Duo. The App Store seller is Squircle Apps LLP. Deck-Man came out on October 14, 2026, and its App Store description says it brings the look and feel of classic portable cassette players "to your iPhone Duo".
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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 2.152.0 (released October 27, 2026) don't mention the Duo.
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