An accordion you play by squeezing the Duo's hinge, with a keyboard on the cover
Does Bellowsby: Squeeze Accordion work on iPhone Duo?
Yes, the developer says so: Bellowsby 1.0, on the App Store since October 15, 2026, is made for iPhone Duo, with the hinge working the bellows and a keyboard on the cover.
- App Store confirmedPascal Wheeler, the developer, in the App Store description and on the app's site, which say the Duo's hinge works Bellowsby's bellows. Version 1.0 was released October 15, 2026.
Adapted for the fold
- Closed · Outer display
A keyboard on the cover
Closed, the cover shows the front of the accordion, its settings and a small keyboard you can play.
- Book · Partly folded
Squeeze to play
Bring the two halves together and apart to pump the bellows; faster squeezes play louder, brighter notes. In Manual mode, how far the phone is open picks the note.
About Bellowsby: Squeeze Accordion
Bellowsby is an accordion by Pascal Wheeler. Pick a tune and each squeeze plays its next note, or choose a scale and make up your own melody. On the Duo, folding the phone does the pumping, the developer says; on other iPhones, you work the bellows on screen with two thumbs.
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: "Made for iPhone Duo, where the hinge is the bellows." (version 1.0, released October 15, 2026).
App version: 1.0.
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 App Store description and the app's site, which describe the hinge working the bellows and a keyboard on the cover. Version 1.0 is on the App Store.
App version: 1.0.
The five App Store pictures show the accordion on an ordinary tall iPhone screen with the Dynamic Island, or unframed. None shows it running on a Duo or the hinge at work. No build was tested.
View reviewed evidence ↗
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 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/bellowsby/"><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: Bellowsby on the App Store (apps.apple.com) · Bellowsby on the developer's site (oooooh.co.uk)
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