Fits Duo
Submit your app

iPhone Duo is out. Developers are updating their apps, so statuses may change over the next few days. Report how an app fits

All apps

Natural Cycles

NaturalCycles Nordic ABUtilities

View in the App Store
On iPhone Duo

Letterboxed

Natural Cycles runs in an iPhone-sized window with black bars.

Want Natural Cycles to fill the inner display? Be the first to ask.

Its latest version is built with the iOS 26.4 SDK,[1] which Apple shows letterboxed on the inner display.[2]

How we know
From the app’s build
Checked on
Version 5.9.4
Build
iOS 26.4 SDK
Latest version
5.9.4, Oct 15, 2026
Status updated

What owners report

No reports from owners yet. Add yours

Version history

  1. Version 5.9.4Letterboxed

    iOS 26.4 SDK

    Checked Oct 24, 2026

Sources

  1. App Store build, version 5.9.4

    Built with the iOS 26.4 SDK. Uses none of Apple’s iPhone Duo APIs.

  2. Apple Developer: Prepare your app for iPhone Duo
See all 720