Fixed-scope offer
iPhone Duo readiness review
- Price
- From £2,500
- Time
- 2 weeks
- Payment
- 50% deposit to book, balance on launch; monthly plans billed in advance.
iPhone Duo is a new device and few apps are ready for it. We've built for it. In two weeks we review your existing iPhone app against Apple's published guidance for the foldable, fix the layout problems it will hit, and give you a written test report.
We reply within one working day.
What happens after you get in touch
We reply within one working day.
Step 1
We reply within one working day
We read what you sent and come back with questions, a rough view of cost, or a time to talk.
Step 2
A 20-minute call
We talk through what you need and tell you honestly whether we're the right team. No charge and no obligation.
Step 3
A written, fixed-price proposal
Scope, price and timeline in writing. Nothing starts until you've signed it off.
Who it's for
Teams with a live iPhone app, whatever it's built with, who want it to work properly when customers open it on iPhone Duo rather than find out from reviews.
What you get: An app that lays out correctly on both displays and in every pose Apple documents, the fixes made in your code, and a written test report you keep.
What's included
- A code review for the patterns Apple says break on iPhone Duo: sizing from the main screen, layout decisions made from device orientation, and layouts chosen by device idiom or by assuming a regular width means iPad.
- Layout by size class: a compact-width layout for the outer display and a regular-width layout for the inner display, sized to the container rather than to fixed iPhone dimensions, as Apple's guidance asks.
- Reserved regions: content kept clear of the fold (a division) and the cameras (an occlusion) using Apple's ReservedRegion API, or the system containers that handle them for you.
- Split View on the inner display and the asymmetric safe areas that come with it, so controls along one edge never cover content.
- The outer display: your navigation bars, toolbars and tab bars, which the system can present vertically along the side, checked so every item has an icon and nothing important is dropped.
- Opening, closing, folding and rotating: every view, sheet and popover checked in each pose, following Apple's testing guidance.
- A written test report with screenshots from the iPhone Duo simulator, what we changed, and what we recommend next, for example a camera capture accessory on the outer display if your app uses the camera.
Not included
- New features designed for the device, such as a second-screen experience or content on the outer display during capture. We scope those separately once the app is ready.
- Claims about hardware we haven't tested. We test in Apple's iPhone Duo simulator in Xcode 27.1, and on a device when one is available; where a behaviour comes from Apple's documentation rather than our own test, the report says so.
- iPad and Mac versions of the app.
What Apple's documentation says the device changes
- 1
Two displays, many sizes
A compact outer display and a large inner display, each with a front camera. Apple's guidance is that an iPhone app can now have any combination of size classes, so layouts must come from size classes and the space available, not from the device type or its orientation.
- 2
The fold and the cameras are reserved regions
When the device is partly open, the fold divides the inner display. The outer camera sits in a corner of its display, and the inner camera appears only while it is in use. iOS reports all of these as reserved regions, and content has to be arranged around them. System containers such as split views do this for you; custom layouts have to ask.
- 3
Bars move to the side
In some poses the system presents navigation bars, toolbars and tab bars vertically along the side of the display. Items without an icon aren't shown vertically, which is how buttons quietly disappear on apps that haven't been checked.
How it runs
- Days 1 to 3We build your app with Xcode 27.1, run it in the iPhone Duo simulator in every pose and orientation, and review the code for the patterns Apple lists. You get a findings list with a fix for each.
- Days 4 to 8The fixes: size-class layouts, reserved regions, bars and Split View, with a TestFlight build you can try.
- Days 9 to 10A re-test in every pose, the written report with screenshots, and a short call about what to do next.
Why trust us with it
We've built for iPhone Duo ourselves: our own app, Cuefold, puts your script on the outer screen on iPhone Duo, and was built with Xcode 27.1 and the iPhone Duo SDK, the same tools we use for this review. It's on the App Store today.
What this is based on
Every technical statement on this page comes from Apple's public developer documentation, listed here. Where our report relies on a documented behaviour rather than our own test, it says so.
- 1Preparing your app for iPhone Duo (Apple technology overview)
- 2Three steps to make your app shine on iPhone Duo (Apple Developer)
- 3Designing for iPhone Duo (Human Interface Guidelines)
- 4ReservedRegion (SwiftUI documentation)
- 5ArrangementView (SwiftUI documentation)
- 6CameraCaptureAccessory (SwiftUI documentation)
After launch
Keep it working after launch
Websites and apps need looking after once they're live. App care is the plan most people choose after this, at £450 a month.
Already have an app or site that needs looking after?Up to 4 hours of changes a monthFits after this
App care
£450 a month
We keep your app working on each new iOS or Android, passing App Review or Play policy and looking current in the store, with time each month for changes.
What's coveredin App careUp to 1 hour of small edits a month
Website care
£95 a month
We keep your website online, up to date and secure, and make the small changes you need each month.
What's coveredin Website careUp to 3 hours of changes a month
Website care Plus
£195 a month
Everything in Website care, with three hours of changes a month for sites that need new pages, offers or content most months.
What's coveredin Website care Plus2 reserved build days a month, more if you need them
Ongoing development
From £1,500 a month
From £1,500 a month for 2 reserved build days to keep improving your app or web product, with a backlog we prioritise together and a release each month.
What's coveredin Ongoing development
Month to month, billed in advance. Cancel with 30 days' notice. Pay yearly for two months free. Prices exclude VAT.
Questions we get asked
Yes. The app still runs in an iOS scene and is resized the same way, so the same rules about size classes, orientation and reserved regions apply. Some fixes sit in the framework or its plugins rather than in your code; the findings list says which, and what the framework version you're on supports.
The app still runs. Apple's documentation says an app built with Xcode 26 or earlier doesn't extend under the status bar and camera on iPhone Duo, and layouts that size from the main screen or from device orientation can lay out wrongly when the device is folded, opened or rotated. How bad that looks depends on the app, which is what the first three days find out.
We test in the iPhone Duo simulator in Xcode 27.1, which Apple describes as the best way to test the full native experience, and on a device when one is available to us or to you. The report is clear about which is which, and we don't claim results on hardware we haven't tested.
Apple's guidance is to lay out by size class and reserved region, not by orientation or device, and that's what we do. Apple also provides hinge APIs for effects that respond to the fold; we'd only use them for something people can see, after the layout is right.
The review, the fixes for the patterns above and the report, for one iPhone app of ordinary size. An app with a great many custom layouts, or a game, is quoted after the day-three findings, before any fixes start.
App care at £450 a month keeps the app current as Apple updates iOS and the device, with four hours of changes a month. If you want a feature made for the device, such as content on the outer display, we scope that as its own piece of work.
Read before you start
- After launch
- Plan your budget
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Start with a 20-minute call with our team.
Tell us where you are and what you need. We'll tell you honestly whether this offer fits, or what would. We reply within one working day.
We reply within one working day. Or call 020 3540 5048