Does Instapaper work on iPhone Duo?

Yes. Instapaper 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 Instapaper letterboxed on iPhone Duo?

No. Instapaper fills the inner display.

All apps

Instapaper

Name: Instapaper
Author: Instant Paper, Inc.

Instant Paper, Inc.News

View in the App Store

On iPhone Duo

Fits

Instapaper 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 10.1
Build: iOS 27.1 SDK
uses Apple’s iPhone Duo APIs
Latest version: 10.1, Oct 21, 2026
Status updated: Oct 27, 2026

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Version history

Version 10.1Fits
iOS 27.1 SDK
Checked Oct 27, 2026

Sources

App Store build, version 10.1
Built with the iOS 27.1 SDK. Uses UIHingeInteraction.
App Store: Instapaper 10.1 release notes