# Test every pose in Xcode's Device Hub

> Xcode 27.1 adds an iPhone Duo simulator with on-screen controls to open, close, rotate and fold the device.

Source: https://iphoneduosupport.com/checklist/device-hub-pose-testing/

Severity: polish
Category: tooling
Applies to: all
Symptom: Layout bugs that only appear in a pose nobody tested, discovered by users after release.
Sources: https://developer.apple.com/videos/play/tech-talks/111461/ https://developer.apple.com/videos/play/tech-talks/111463/
Last verified: 2026-09-09

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Download **Xcode 27.1** and run your app in the iPhone Duo simulator using **Device Hub**. On-screen control buttons let you open, close, rotate, and fold the device to check your layout in every pose.

## A pose matrix worth running

Poses multiply with orientation and multitasking, so test deliberately rather than by exploration:

<div class="table-scroll">

| State | What to check |
| --- | --- |
| Closed, portrait | Compact-width layout on the outer display |
| Closed, landscape | Heavier toolbar overflow |
| Open flat, portrait | Regular width; sidebar should appear |
| Open flat, landscape | Vertical bars active |
| Partially folded | Division region active; nothing across the fold |
| Propped on a table | Content readable at distance in the top region; controls reachable in the bottom |
| Split View, various widths | Continuous reflow across the divider's full range |
| Second scene open | Independent state in each window |

</div>

The transitions matter as much as the states. Most bugs surface while folding, not after.

## Automate the parts you can

Snapshot tests at the two display sizes catch regressions cheaply once the layout is right:

- Inner display: 626 × 890 points
- Outer display: 466 × 678 points

These will not catch division regions or pose-specific behaviour, so keep the manual pass for those.

## How to verify

Walk the matrix above once per release on your primary flows. Record the pass so a regression later has something to compare against.

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Published by iPhone Duo Support (https://iphoneduosupport.com). Not affiliated with Apple Inc.