Does iHerb work on iPhone Duo?

Not yet. iHerb runs letterboxed on the inner display, with black borders around an iPhone-sized window. Its latest version is built with the iOS 26.2 SDK, which Apple shows letterboxed on the inner display.

Is iHerb letterboxed on iPhone Duo?

Apps built with the iOS 26 SDK or earlier show black borders around an iPhone-sized window on the inner display; iOS 27 apps resize to fill most of it, and iOS 27.1 apps fill it completely. Current status: Letterboxed.

All apps

iHerb

Name: iHerb: Vitamins & Supplements
Author: iHerb LLC

iHerb LLCShopping

View in the App Store

On iPhone Duo

Letterboxed

iHerb runs in an iPhone-sized window with black bars.

Its latest version is built with the iOS 26.2 SDK,[1] which Apple shows letterboxed on the inner display.[2]

How we know: From the app’s build
Checked on: Version 12.10.1015
Build: iOS 26.2 SDK
Latest version: 12.10.1015, Oct 15, 2026
Status updated: Oct 24, 2026

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Version history

Version 12.10.1015Letterboxed
iOS 26.2 SDK
Checked Oct 24, 2026

Sources

App Store build, version 12.10.1015
Built with the iOS 26.2 SDK. Uses none of Apple’s iPhone Duo APIs.
Apple Developer: Prepare your app for iPhone Duo