Does Compass GPS Altimeter work on iPhone Duo?

Yes. Compass GPS Altimeter has been updated for iPhone Duo and uses the full inner display. Its latest version is built with the iOS 27.2 SDK and uses Apple’s iPhone Duo APIs.

Is Compass GPS Altimeter letterboxed on iPhone Duo?

No. Compass GPS Altimeter fills the full inner display.

All apps

Compass GPS Altimeter

Name: Compass GPS Altimeter
Author: 成都关键元素科技有限公司

成都关键元素科技有限公司Travel

View in the App Store

On iPhone Duo

Fits

Compass GPS Altimeter fills the inner screen and adapts when you fold.

Its latest version is built with the iOS 27.2 SDK and uses Apple’s iPhone Duo APIs.[1]

How we know: From the app’s build
Checked on: Version 3.3.7
Build: iOS 27.2 SDK
uses Apple’s iPhone Duo APIs
Latest version: 3.3.7, Nov 1, 2026
Status updated: Nov 5, 2026

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Version history

Version 3.3.7Fits
iOS 27.2 SDK
Checked Nov 5, 2026

Sources

App Store build, version 3.3.7
Built with the iOS 27.2 SDK. Uses UIHingeInteraction and UIViewReservedRegionKind.