Does Prompt 3 work on iPhone Duo?

Yes. Prompt 3 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 Prompt 3 letterboxed on iPhone Duo?

No. Prompt 3 fills the inner display.

All apps

Prompt 3

Name: Prompt 3
Author: Panic, Inc.

Panic, Inc.Utilities

View in the App Store

On iPhone Duo

Fits

Prompt 3 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 3.5.3
Build: iOS 27.1 SDK
uses Apple’s iPhone Duo APIs
Latest version: 3.5.3, Oct 7, 2026
Status updated: Oct 26, 2026

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Version history

Version 3.5.3Fits
iOS 27.1 SDK
Checked Oct 26, 2026

Sources

App Store build, version 3.5.3
Built with the iOS 27.1 SDK. Uses systemTraitsAffectingVerticalBarEdge.