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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 time20:25:16

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Indoor Thermometer

Ravibhai RamaniUtilities

View in the App Store
On iPhone Duo

Letterboxed

Indoor Thermometer 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 1.0
Build
iOS 18.5 SDK
Latest version
1.0, Sep 16, 2025
Status updated

What owners report

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Version history

  1. Version 1.0Letterboxed

    iOS 18.5 SDK

    Checked Oct 21, 2026

Sources

  1. App Store build, version 1.0

    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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