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iPhone Duo goes on sale Oct 23, 2026. Developers are likely to update their apps then, so statuses are for reference until launch.

Release day, your time21:28:31

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Weather Underground

Weather Underground, LLCUtilities

View in the App Store
On iPhone Duo

Letterboxed

Weather Underground runs in an iPhone-sized window with black bars.

Its latest version is built with the iOS 18.5 SDK,[1] which Apple shows letterboxed on the inner display.[2]

How we know
From the app’s build
Checked on
Version 6.21
Build
iOS 18.5 SDK
Latest version
6.21, Jun 30, 2025
Status updated

What owners report

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Version history

  1. Version 6.21Letterboxed

    iOS 18.5 SDK

    Checked Oct 21, 2026

Sources

  1. App Store build, version 6.21

    Built with the iOS 18.5 SDK. Uses none of Apple’s iPhone Duo APIs.

  2. Apple Developer: Prepare your app for iPhone Duo
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