iPhone Duo
compatibility
testing.
Find the layout, state, and interaction issues that only become obvious when an iOS app moves between the outer display, inner display, and real hands.
Request compatibility testingA simulator can show
the screen. Hardware shows the use.
Compatibility is more than whether an app launches. A real iPhone Duo pass follows a task while the available space changes, checking whether the user keeps their place, can reach the next action, and understands what changed.
The test starts with your important journey, then exercises the device states around it. That keeps the findings tied to a real product outcome.
What iPhone Duo
compatibility testing covers.
- 01LAYOUT
Display state changes
Compare outer and inner layouts for readable hierarchy, reachable controls, and intentional use of extra space.
- 02STATE
Continuity during a task
Open or close the device after input, selection, navigation, or an unsaved change and check that state survives.
- 03INTERACTION
Safe areas and gestures
Inspect edge controls, vertical system UI, taps, swipes, keyboard reachability, and the feel of the app in hand.
- 04RESIZING
Rotation and Split View
Resize the app through supported orientations and shared-screen widths while keeping the important action available.
A focused compatibility
test matrix.
Use the same flow in each state so the result is comparable and every issue has a clear reproduction path.
| State | Run | Look for | Evidence |
|---|---|---|---|
| Outer display | Complete the critical flow closed. | Reachable actions and readable content. | Screenshot + result |
| Inner display | Repeat the same flow open. | Useful hierarchy without empty or hidden controls. | Screenshot + result |
| Open / close | Change state mid-task. | Selection, input, scroll, and navigation continuity. | Short recording |
| Rotation | Rotate during the flow. | Reflow, overlays, and focused controls. | Before / after |
| Split View | Resize beside another app. | Minimum usable width and primary actions. | Recording + still |
Findings your team
can work from.
The deliverable is a concise report centered on what happened, where it happened, and how to reproduce it. When useful, it includes screenshots or short recordings from the tested state.
What changed?
The device state, screen, flow step, and visible behavior are named clearly.
What to check?
Reproduction steps and a focused area for your team to investigate keep the note useful.
Want your app checked?
Share the flows that matter and I’ll confirm scope, timing, and price before testing begins.
Common questions.
What does iPhone Duo compatibility testing cover?
It can cover display states, transitions, safe areas, gestures, rotation, Split View, and the critical flows you identify in your request.
Can this replace the iPhone Duo simulator?
No. The simulator is useful for preparation. A real-device pass checks physical handling and behavior after the device is available.
When does physical testing begin?
Requests can be scoped now. Testing begins after the iPhone Duo arrives, with timing confirmed before work starts.