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FASTFOUR LLC.

FASTFOUR, LLC.Finance

View in the App Store
On iPhone Duo

Letterboxed

FASTFOUR LLC. runs in an iPhone-sized window with black bars.

Want FASTFOUR LLC. to fill the inner display? Be the first to ask.

Its latest version is built with the iOS 26.5 SDK,[1] which Apple shows letterboxed on the inner display.[2]

How we know
From the app’s build
Checked on
Version 3.37.0
Build
iOS 26.5 SDK
Latest version
3.37.0, Oct 28, 2026
Status updated

What owners report

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Version history

  1. Version 3.37.0Letterboxed

    iOS 26.5 SDK

    Checked Oct 29, 2026

Sources

  1. App Store build, version 3.37.0

    Built with the iOS 26.5 SDK. Uses none of Apple’s iPhone Duo APIs.

  2. Apple Developer: Prepare your app for iPhone Duo
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