Does hYYa ink work on iPhone Duo?

Yes. hYYa ink is updated for iPhone Duo and uses the full inner display. Its latest version is built with the iOS 27.1 SDK and uses Apple’s iPhone Duo APIs.

Is hYYa ink letterboxed on iPhone Duo?

No. hYYa ink fills the inner display.

All apps

hYYa ink

Name: hYYa ink: PDF & Markdown
Author: Hassaan Abdeen

Hassaan AbdeenUtilities

View in the App Store

On iPhone Duo

Fits

hYYa ink fills the inner screen and adapts when you fold.

Its latest version is built with the iOS 27.1 SDK and uses Apple’s iPhone Duo APIs.[1]

How we know: From the app’s build
Checked on: Version 2.0.3
Build: iOS 27.1 SDK
uses Apple’s iPhone Duo APIs
Latest version: 2.0.3, Oct 25, 2026
Status updated: Oct 26, 2026

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Version history

Version 2.0.3Fits
iOS 27.1 SDK
Checked Oct 26, 2026

Sources

App Store build, version 2.0.3
Built with the iOS 27.1 SDK. Uses SwiftUI’s reservedRegions and systemTraitsAffectingVerticalBarEdge.