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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.

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Grammarly

Superhuman Platform IncProductivity

View in the App Store
On iPhone Duo

Partly fits

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

Its latest version is built with the iOS 27 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 15.2.0
Build
iOS 27.0 SDK
Latest version
15.2.0, Oct 14, 2026
Status updated

What owners report

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Sources

  1. App Store build, version 15.2.0

    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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