Does Wikiloc work on iPhone Duo?

Yes. Wikiloc 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 Wikiloc letterboxed on iPhone Duo?

No. Wikiloc fills the inner display.

All apps

Wikiloc

Name: Wikiloc - Trails of the World
Author: Wikiloc Outdoor SL

Wikiloc Outdoor SLMaps

View in the App Store

On iPhone Duo

Fits

Wikiloc 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 3.31.1
Build: iOS 27.1 SDK
uses Apple’s iPhone Duo APIs
Latest version: 3.31.1, Oct 27, 2026
Status updated: Oct 28, 2026

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Version history

Version 3.31.1Fits
iOS 27.1 SDK
Checked Oct 28, 2026

Sources

App Store build, version 3.31.1
Built with the iOS 27.1 SDK. Uses UIView.reservedRegions, UIArrangementViewController and UISplitArrangement.
App Store: Wikiloc 3.31.1 release notes