--- title: Apple reveals the iPhone Duo, its first foldable smartphone description: Apple has launched the iPhone Duo, its first foldable smartphone, unveiled at a Cupertino event roughly seven years after Samsung's first foldable. It's also... canonical: https://daily.dev/posts/apple-reveals-the-iphone-duo-its-first-foldable-smartphone-maa8eli9e twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Apple reveals the iPhone Duo, its first foldable smartphone | daily.dev og:description: Apple has launched the iPhone Duo, its first foldable smartphone, unveiled at a Cupertino event roughly seven years after Samsung's first foldable. It's also... og:url: https://daily.dev/posts/apple-reveals-the-iphone-duo-its-first-foldable-smartphone-maa8eli9e og:image: https://api.daily.dev/og/posts/MaA8ElI9e.png og:image:alt: Apple reveals the iPhone Duo, its first foldable smartphone og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Apple reveals the iPhone Duo, its first foldable smartphone **[Collections](https://daily.dev/sources/collections)** · 7 min read · 45 upvotes · 17 comments ## Summary Apple has launched the iPhone Duo, its first foldable smartphone, unveiled at a Cupertino event roughly seven years after Samsung's first foldable. It's also the first major product launch under new CEO John Ternus. Unlike early clamshell foldables, Apple opted for a wider aspect ratio geared toward video viewing, similar to designs already used by Samsung and Xiaomi. Foldables remain under 2% of smartphone shipments, but Counterpoint Research projects the Duo could grab up to 25% of that segment by year end. ## Content ## The device Apple's first foldable, the iPhone Duo, starts at $1,999 for 256GB and ships October 23, with pre-orders opening October 16. It comes in Night Sky and Star White. The outer display is 5.4 inches; unfold it and you get a 7.6-inch inner display. Both share the same aspect ratio, which is a deliberate choice that simplifies some layout decisions for developers. The frame is titanium, the chip is the same A20 Pro from the iPhone 18 Pro (two-nanometer, roughly 40% graphics improvement over its predecessor), and there's a new C2 modem alongside it. The rear camera setup is two 48MP shooters — a Fusion Main and an Ultra Wide — but no telephoto. Front cameras are an outer ultrawide and an inner under-display ultrawide. Software features include Smart Take, Kid Cue, Duo Preview, and FaceTime Duo. The fold crease is still there. A nano-texture polymer and micro lens texture reduce its visibility, and Apple uses AI-assisted manufacturing — a confocal laser scans each unit's hinge topology and 3D prints up to 25 micro layers of custom photopolymer to eliminate waviness — but in certain lighting you'll still see it. Battery life is rated at 44 hours of video playback via a dual battery system. Touch ID replaces Face ID. That's the one that'll catch people off guard. --- ## The market context Foldables have been around since Royole's 2018 device, with Samsung's early 'foldgate' screen failures doing the category no favors. The market has matured since — Motorola's Razr revival, Huawei's Mate X, Google's Pixel Fold, and 2024's tri-fold devices from Huawei and Samsung have all pushed it forward. Samsung currently holds about 40% of the foldable market, Huawei around 30%. Foldables are still under 2-3% of total smartphone shipments. Analysts at Counterpoint think the Duo could capture up to 25% of the foldable segment by year end, which would be significant without being transformative for Apple's overall numbers. Samsung, predictably, trolled the announcement on social media. One fair criticism: Apple was unusually vague about who this phone is actually for. The iPad launch had a clear pitch. The Apple Watch had a clear pitch. The Duo's positioning felt closer to Vision Pro — technically impressive, obviously expensive, and somewhat undefined. Strong brand loyalty will probably carry it anyway. --- ## What developers need to do This is where it gets complicated. The Duo runs iOS 27.1, and there are effectively three tiers of app behavior depending on how you build: - **iOS 27 SDK**: Apps already benefit from prior iPhone resizing work but don't get full edge-to-edge layout on the inner display. - **iOS 27.1 SDK**: Full edge-to-edge layout, with navigation and toolbar buttons repositioning vertically along the side. This is what you want. - **Unupdated apps**: They'll run, but they'll look bad. One screenshot circulating shows exactly how bad. Xcode 27.1 ships a Device Hub simulator for the Duo and an "App Resizability" modernization skill that audits projects for common issues. The beta is available now; the deadline to ship before pre-orders open is October 16. ### The core mental shift Stop thinking about screen size as a fixed value. The Duo has six poses: closed portrait, closed landscape, open portrait, open landscape, and two partially-folded states (book/tent). Your app needs to handle all of them without reloading view controllers or losing session state. The inner display reports **regular width and regular height** — it ignores orientation locks. The outer display is compact width. Design around those two size classes first, then verify across the six poses. **Stop branching on device idiom or orientation.** Size classes are the right abstraction here. ### Controls move to the sides On the inner display in landscape, navigation bars, toolbars, and tab bars shift from top/bottom positions to a vertical bar along the side edge. This frees up vertical space for content. The inner display in portrait is an exception — horizontal controls stay horizontal there. Wide items like text buttons and segmented controls also stay in their original horizontal position; overflow menus handle crowded vertical bars. Mail, Fitness, and Music are good reference points for how Apple handles this in practice. Play around with Apple's apps in landscape and take notes. In Split View (two apps or two windows of the same app side by side), controls follow whichever outer edge your app occupies. ### Safe areas and reserved regions Safe area insets are now **asymmetric**. The hinge creates a reserved region that interactive content needs to stay clear of. New APIs handle this: - **SwiftUI**: `reservedRegion` method on the geometry proxy - **UIKit**: `reservedRegion` method on `UIView`, with a `frame` property for custom layouts - **ArrangementView / UIArrangementViewController**: New in iOS 27.1, for split and overlay layout styles around the fold For rounded views near screen edges, use Apple's Concentricity APIs to match screen corners correctly. `UIScreen.main` is being deprecated — stop using it. ### Hinge angle APIs The hinge isn't just open or closed. It reports continuous angle data: - **SwiftUI**: `onHingeChange` modifier - **UIKit**: `UIHingeInteraction` Both provide hinge angle and status (closed, partially open, fully open). One demo used this for a guitar app whammy-bar effect. The practical uses are things like tabletop mode interactions, tent-mode layouts, and any UI that should respond to how far the device is folded. ### Navigation patterns `NavigationSplitView` and `UISplitViewController` automatically collapse to single-column on the outer display and expand to two-column on the inner display. `TabView` with `.tabViewStyle(.sidebarAdaptable)` (available since iOS 18) presents tab bars as sidebars on wider layouts. These system containers handle a lot of the adaptation work for you — let them. ### Multi-window Split View supports two simultaneous app instances. New windows can only be created on the inner display. Scene accessories like `CameraCaptureAccessory` let camera apps show a teleprompter or controller UI on the outer display while the main camera UI stays on the inner display. ### Camera The virtual front camera auto-switches between the physical inner and outer cameras. Capabilities differ: - Inner camera: 1080p at 60fps - Outer camera: 4K at 120fps - Virtual camera: capped at 1080p/60fps, no depth Use `AVCaptureDevice.DiscoverySession` to find the virtual front camera, or `AVCaptureDeviceDirectionCoordinator` in AVKit for finer control over camera-facing direction as the device opens, closes, or flips. Handle rotation via `AVCaptureDeviceRotationCoordinator`. ### Sheets and fold avoidance System components — sheets, alerts, menus — already have built-in fold avoidance to keep interactive elements clear of the curved center. For custom sheets, behavior changes across the six poses. You can disable the vertical toolbar bar in SwiftUI with `.toolbarVerticalBehavior(.disabled)` for single-button sheets where the vertical bar doesn't make sense. --- ## The broader developer picture Flutter and React Native don't have proper fold-state APIs yet, which puts cross-platform apps at a disadvantage here. Native Swift apps built with the right APIs will handle the Duo's poses correctly; cross-platform apps will need workarounds that may not exist yet. Apps with hardcoded layouts or view controllers that reload on size change will need real rework — not just a quick pass. The Duo is, as one developer put it, going to be a rude awakening for anyone who's been cutting corners on adaptive layouts. Apple has published updated Human Interface Guidelines for iPhone Duo and released six Tech Talk videos covering design adaptation, toolbar changes, adaptive layouts, multitasking, and camera handling. The suggested watch order is: design overview → app preparation → toolbars → adaptive layouts → multitasking → camera. As a first-generation foldable from Apple, some growing pains are probably inevitable. But the APIs are real, the simulator is available now, and October 16 is the deadline that matters. ## Questions this post answers ### How should I adapt my iOS app's layout for the new iPhone Duo foldable display? Apple recommends avoiding fixed layouts and hardcoded breakpoints, since the Duo's outer display uses a compact width size class while the inner display uses regular width. Move primary controls to the sides of the screen rather than top or bottom, use split views or sidebar tab bars on the wide inner display, and account for the fold area in custom layouts since sheets and picture-in-picture windows avoid it automatically only by default. _Developers adapting layouts for the iPhone Duo can track iOS guidance changes on daily.dev._ ### Does the iPhone Duo support running two apps side by side? Yes, the inner display supports split-view multitasking with two apps running side by side. Apple advises developers to explicitly test their apps in this split-view context on the wide inner screen, since layouts that work fine full-screen may feel cramped or break when constrained to half the display. _Teams planning multitasking support can follow foldable iOS updates like this one on daily.dev._ ### What percentage of the smartphone market do foldables like the iPhone Duo represent? Foldables still make up under 2% of global smartphone shipments, according to Counterpoint Research, though the firm projects the iPhone Duo could capture up to 25% of that foldable segment by year end. _Anyone deciding whether to prioritize foldable support can follow market data like this on daily.dev._ ## Community discussion Top comments from developers on daily.dev. **@arifaydindev** · 3 upvotes > first foldable smartphone? **@thecookingsenpai** · 1 upvotes > Dual screen phones are a powerbomb for productivity, if done well. I made a lot of remote work on my Galazy 3 Z Flip (or whatever). I hope Apple nails it. **@mheob** · 1 upvotes > I think this will be a big success for Apple. **@doncho** · 1 upvotes > Very, very nice. I'm looking forward to seeing this device. > > That might be my next phone... With quite high probability... **@wezdev** · 1 upvotes > it look horrible, at this point get an Ipad --- Tags: [#apple](https://daily.dev/tags/apple) [View this post on daily.dev](https://daily.dev/posts/apple-reveals-the-iphone-duo-its-first-foldable-smartphone-maa8eli9e) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Apple reveals the iPhone Duo, its first foldable smartphone","url":"https://daily.dev/posts/apple-reveals-the-iphone-duo-its-first-foldable-smartphone-maa8eli9e","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/apple-reveals-the-iphone-duo-its-first-foldable-smartphone-maa8eli9e"},"datePublished":"2026-09-09T18:07:02.128Z","dateModified":"2026-09-16T06:00:27.329Z","description":"Apple has launched the iPhone Duo, its first foldable smartphone, unveiled at a Cupertino event roughly seven years after Samsung's first foldable. 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I made a lot of remote work on my Galazy 3 Z Flip (or whatever). I hope Apple nails it.","datePublished":"2026-09-10T07:10:52.232Z","url":"https://daily.dev/posts/MaA8ElI9e#c-i6yzWWT0q","author":{"@type":"Person","name":"TheCookingSenpai","url":"https://daily.dev/thecookingsenpai","image":"https://media.daily.dev/image/upload/s--ffrIwc1G--/f_auto/v1757426086/avatars/avatar_ScKiWPtqpsvwHAvAS0jvG?_a=BAMClqZW0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"I think this will be a big success for Apple.","datePublished":"2026-09-10T16:20:56.066Z","url":"https://daily.dev/posts/MaA8ElI9e#c-WTEDHehY0","author":{"@type":"Person","name":"Alex Böhm","url":"https://daily.dev/mheob","image":"https://avatars3.githubusercontent.com/u/3983539?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"Very, very nice. I’m looking forward to seeing this device.\nThat might be my next phone… With quite high probability…","datePublished":"2026-09-10T05:08:21.542Z","url":"https://daily.dev/posts/MaA8ElI9e#c-TQ5iMKzA9","author":{"@type":"Person","name":"Doncho Angelov","url":"https://daily.dev/doncho","image":"https://media.daily.dev/image/upload/s--j1MSm0hy--/f_auto/v1716369534/avatars/avatar_EB0j0Umzh5v3zGWUSL5ma"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"it look horrible, at this point get an Ipad","datePublished":"2026-09-11T17:51:12.401Z","url":"https://daily.dev/posts/MaA8ElI9e#c-PTVoYq2Jb","author":{"@type":"Person","name":"Christophe Amoussouvi","url":"https://daily.dev/wezdev","image":"https://lh3.googleusercontent.com/a/ACg8ocIlnjmZAsb83MDXxTmnT_IblzSazOiN4D4nsG95gBaQTflDww=s96-c"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/apple-reveals-the-iphone-duo-its-first-foldable-smartphone-maa8eli9e#faq","mainEntity":[{"@type":"Question","name":"How should I adapt my iOS app's layout for the new iPhone Duo foldable display?","acceptedAnswer":{"@type":"Answer","text":"Apple recommends avoiding fixed layouts and hardcoded breakpoints, since the Duo's outer display uses a compact width size class while the inner display uses regular width. 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