Does Haven work on iPhone Duo?

Yes. Haven 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 Haven letterboxed on iPhone Duo?

No. Haven fills the inner display.

All apps

Haven

Name: Haven: Setup Codes
Author: João Franco

João FrancoUtilities

View in the App Store

On iPhone Duo

Fits

Haven 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 1.4.2
Build: iOS 27.1 SDK
uses Apple’s iPhone Duo APIs
Latest version: 1.4.2, Oct 20, 2026
Status updated: Oct 22, 2026

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Version history

Version 1.4.2Fits
iOS 27.1 SDK
Checked Oct 22, 2026

Sources

App Store build, version 1.4.2
Built with the iOS 27.1 SDK. Uses SwiftUI’s ArrangementView, OverlayArrangementViewStyle and reservedRegions.