Does HyFlow work on iPhone Duo?

Yes. HyFlow 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 HyFlow letterboxed on iPhone Duo?

No. HyFlow fills the inner display.

All apps

HyFlow

Name: HyFlow: Awesome Note, Evolved
Author: BRID

BRIDProductivity

View in the App Store

On iPhone Duo

Fits

HyFlow 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 6.5.1
Build: iOS 27.1 SDK
uses Apple’s iPhone Duo APIs
Latest version: 6.5.1, Oct 20, 2026
Status updated: Oct 24, 2026

What owners report

1 report from people using iPhone Duo

Fits: 1
Partly fits: 0
Letterboxed: 0
Has issues: 0
Doesn’t work: 0

Version history

Version 6.5.1Fits
iOS 27.1 SDK
Checked Oct 24, 2026

Sources

App Store build, version 6.5.1
Built with the iOS 27.1 SDK. Uses UIView.reservedRegions and SwiftUI’s reservedRegions and toolbarVerticalEdge.