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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 time15:18:49

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Spark Mail

Readdle Technologies LimitedProductivity

View in the App Store
On iPhone Duo

Partly fits

Spark Mail uses most of the inner screen, but not all of it.

Its latest version is built with the iOS 27.0 SDK.[1] The iOS 27 SDK fills most of the inner display, and the iOS 27.1 SDK fills all of it.[2]

How we know
From the app’s build
Checked on
Version 3.20.0
Build
iOS 27.0 SDK
Latest version
3.20.0, Oct 15, 2026
Status updated

What owners report

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Version history

  1. Version 3.20.0Partly fits

    iOS 27.0 SDK

    Checked Oct 22, 2026

Sources

  1. App Store build, version 3.20.0

    Built with the iOS 27.0 SDK. Uses none of Apple’s iPhone Duo APIs.

  2. Apple Developer: Prepare your app for iPhone Duo
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