Does Buffer work on iPhone Duo?

Yes. Buffer is updated for iPhone Duo and uses the full inner display. Its latest version is built with the iOS 27.1 SDK and uses Apple’s iPhone Duo APIs.

Is Buffer letterboxed on iPhone Duo?

No. Buffer fills the inner display.

All apps

Buffer

Name: Buffer: Plan & Schedule Posts
Author: Buffer, Inc.

Buffer, Inc.Social

View in the App Store

On iPhone Duo

Fits

Buffer fills the inner screen and adapts when you fold.

Its latest version is built with the iOS 27.1 SDK and uses Apple’s iPhone Duo APIs.[1]

How we know: From the app’s build
Checked on: Version 16.2.1
Build: iOS 27.1 SDK
uses Apple’s iPhone Duo APIs
Latest version: 16.2.1, Oct 22, 2026
Status updated: Oct 30, 2026

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Version history

Version 16.2.1Fits
iOS 27.1 SDK
Checked Oct 30, 2026

Sources

App Store build, version 16.2.1
Built with the iOS 27.1 SDK. Uses SwiftUI’s toolbarVerticalEdge.
App Store: Buffer 16.2.1 release notes