Apple's September 9 event, “Surprise and Shine”, brought the iPhone 18 Pro and Pro Max, new Apple Watch and AirPods models — and the first foldable iPhone. For people who build apps, the foldable and two smaller announcements are the ones to plan around. Details below are from MacRumors' event recap.
The Announcements
- iPhone 18 Pro and Pro Max with the A20 Pro, which Apple calls its first 2nm smartphone chip, a variable-aperture camera and higher US starting prices. Pre-orders opened September 12, with availability on September 18.
- iPhone Duo, a book-style foldable with a 5.4-inch outer display and a 7.6-inch inner one, shipping with iOS 27.1. Pre-orders start October 16 and it launches October 23.
- Apple Reference Image, a Pro camera feature for verifying the authenticity of photos.
- Siri usage limits. Apple's new Siri AI has daily usage limits, with expanded access available for a fee.
- Release candidates of iOS 27 and Apple's other platforms, ahead of their public release.
One App, Two Screen Sizes on One Phone
A 7.6-inch inner display is closer to a small tablet than a phone. On the iPhone Duo, the same app will be used at two very different sizes, and users will switch between them mid-task by opening or closing the device.
Apps already built with adaptive layouts — size classes, flexible SwiftUI stacks, no hard-coded screen widths — are in a good position. Apps that assume one portrait phone width are likely to look out of place on the inner screen. Things worth checking before October:
- Layouts at both sizes, and the transition between them while the app is open.
- State that survives a size change — scroll position, half-filled forms, playing media.
- Whether the larger screen should show more, such as a list beside its detail view, rather than the same layout scaled up.
Proving a Photo Is Real
Apple Reference Image speaks to a problem that grew with generative imagery: knowing whether a photo shows what a camera actually captured. Building verification into the camera, rather than detecting fakes afterwards, is the more robust approach. Apps that handle user photos — marketplaces, insurance claims, news, identity checks — should watch how this becomes available to developers.
AI Has a Cost, and Now It Shows
Daily limits on Siri's AI features, with paid expanded access, are a reminder that large-model features carry a real cost per request — even for Apple. It is the same trade-off every product team faces when adding AI: what runs on-device, which is free per use and private, and what runs in the cloud and has to be paid for. Designing features so the common cases work locally is not only a privacy decision; it is a business model decision.
What to Do Now
- Test your app on the iOS 27 release candidates.
- Review layouts for a 7.6-inch inner display before the Duo ships on October 23.
- If your app uses AI features, know which ones depend on cloud calls and what they cost per user.