Does Ello 2.0 work on iPhone Duo?

Not yet. Ello 2.0 runs letterboxed on the inner display, with black borders around an iPhone-sized window. Its latest version is built with the iOS 26.5 SDK, which Apple shows letterboxed on the inner display.

Is Ello 2.0 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

Ello 2.0

Name: Ello 2.0: Learn Reading & Math
Author: Ello Technology, Inc.

Ello Technology, Inc.Education

View in the App Store

On iPhone Duo

Letterboxed

Ello 2.0 runs in an iPhone-sized window with black bars.

Its latest version is built with the iOS 26.5 SDK,[1] which Apple shows letterboxed on the inner display.[2]

How we know: From the app’s build
Checked on: Version v2026.13.92
Build: iOS 26.5 SDK
Latest version: v2026.13.92, Oct 14, 2026
Status updated: Oct 24, 2026

What owners report

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Version history

Version 2026.13.92Letterboxed
iOS 26.5 SDK
Checked Oct 24, 2026

Sources

App Store build, version v2026.13.92
Built with the iOS 26.5 SDK. Uses none of Apple’s iPhone Duo APIs.
Apple Developer: Prepare your app for iPhone Duo