duology

In the author's own words, from each skill's SKILL.md.

• duo-accessibility

  Makes iPhone Duo apps work with VoiceOver, Dynamic Type, Reduce Motion, Increase Contrast, hardware keyboards, Switch Control and Voice Control on both displays. Use it when VoiceOver reads two panes row by row or loses its place after the phone folds or unfolds, when text truncates or clips on the 5.4-inch outer display at large text sizes, when a hinge effect or resize animation ignores Reduce…

  plugins/duology-design/skills/duo-accessibility/SKILL.md on GitHub (opens in a new tab)

• duo-design-review

  Reviews screenshots, simulator captures and Figma frames for iPhone Duo, Apple's foldable, against a 15-point checklist (letterboxing, state lost on fold and unfold, sizing from UIScreen.main, text or buttons in the fold via reservedRegions .division and .occlusion, odd grid columns, vertical toolbars with symbols and titles, tabletop and book layouts with ArrangementView overlay, camera preview…

  plugins/duology-design/skills/duo-design-review/SKILL.md on GitHub (opens in a new tab)

• duo-design-system

  Design tokens and a drop-in SwiftUI token module for iPhone Duo, Apple's foldable, that adapt by size class instead of by device. Covers a 4-point spacing scale, system margins and gutters with a wider gap at the fold, even-column layout grids (4 compact, 8 regular) with spans, one type scale with Dynamic Type for the 5.4-inch outer and 7.6-inch inner display, Liquid Glass usage and legibility (g…

  plugins/duology-design/skills/duo-design-system/SKILL.md on GitHub (opens in a new tab)

• duo-ergonomics

  Puts controls where hands can reach them on iPhone Duo, Apple's foldable iPhone: one-handed on the closed phone, two hands on the open display, the book grip, and hands-free on a table. Use it when you decide where a primary action, a floating button, player controls or a custom control strip goes; when buttons sit at the top centre of the open display, on the fold or out of thumb reach; when you…

  plugins/duology-design/skills/duo-ergonomics/SKILL.md on GitHub (opens in a new tab)

• duo-patterns

  Picks and builds layout patterns for iPhone Duo, Apple's foldable iPhone, in SwiftUI - list-detail, supporting pane, two-page, dual view, extended canvas, feed reflow with even columns, tabs to sidebar, and displacement off the fold. Use it when you design or fix a screen for the outer display and the inner display, when content or buttons land in the fold, or when choosing between NavigationSpli…

  plugins/duology-design/skills/duo-patterns/SKILL.md on GitHub (opens in a new tab)

• duo-postures

  Designs iPhone Duo screens for every pose Apple shows: closed on the outer display, open flat (wide or tall), partly folded like a book, propped on a table like a laptop (tabletop), standing like a tent, and open and turned around (flipped, rear cameras facing the user). Use it when a screen must work half folded, when you build a tabletop media player or video call (video on top, the same contro…

  plugins/duology-design/skills/duo-postures/SKILL.md on GitHub (opens in a new tab)

• duo-shared-screen

  Builds screens that two people use at the same time on one iPhone Duo, Apple's foldable iPhone - two-player games, teaching, showing a customer, kid and parent. Use when two people share the inner display or the outer display, sit side by side or face to face across a phone lying flat, or when you need one half per person (SharedSplit, an EvenSplit with seating, not ArrangementView), per-half nam…

  plugins/duology-design/skills/duo-shared-screen/SKILL.md on GitHub (opens in a new tab)

• duo-transitions

  Makes fold, unfold, partial fold and rotation on iPhone Duo, Apple's foldable, feel like one app instead of a reload. Use when a screen flashes, blinks, jumps, reloads, pops or moves its controls as the phone opens or closes, or when writing or reviewing SwiftUI or UIKit code that animates a resize: AnyLayout, stable ForEach IDs, matchedGeometryEffect, geometryGroup, .animation(_:value:), transac…

  plugins/duology-design/skills/duo-transitions/SKILL.md on GitHub (opens in a new tab)

• duo-app-intents

  App Intents on iPhone Duo: AppIntent, AppEntity with EntityStringQuery, OpenIntent with TargetContentProvidingIntent and onAppIntentExecution (UISceneAppIntent and AppIntentSceneDelegate in UIKit) to show the right item in the right pane or window, handlesExternalEvents to pick the window, intents that work with the phone closed (supportedModes .background, IntentDialog, ProvidesDialog, isVoiceOn…

  plugins/duology-features/skills/duo-app-intents/SKILL.md on GitHub (opens in a new tab)

• duo-camera

  Camera capture on iPhone Duo, Apple's foldable. Use when an app takes photos or video, runs a video call or shows a camera preview, and must work closed (outer display), open (inner display), partly folded (book, tabletop), open and turned around (flipped) and through fold and unfold. Covers the virtual front camera (.builtInWideAngleCamera or .builtInUltraWideCamera at .front; shared features on…

  plugins/duology-features/skills/duo-camera/SKILL.md on GitHub (opens in a new tab)

• duo-games

  Builds games for iPhone Duo, Apple's foldable. The game fills the closed outer display, the open inner display, book pose and tabletop by changing its aspect ratio instead of letterboxing, as Apple's HIG asks; touch controls stay off the fold; and in tabletop the world sits above the fold with the controls below it, like a handheld console. Use when you build or port a SpriteKit, Metal or SwiftUI…

  plugins/duology-features/skills/duo-games/SKILL.md on GitHub (opens in a new tab)

• duo-intelligence

  Adds Foundation Models to an iPhone Duo app: the on-device model (SystemLanguageModel) and the Private Cloud Compute server model (PrivateCloudComputeLanguageModel) behind one LanguageModelSession API, an AI side pane beside the content when the phone is open or in book pose (split ArrangementView) and a one-line summary when it is closed or in tabletop, streaming (streamResponse with @Generable…

  plugins/duology-features/skills/duo-intelligence/SKILL.md on GitHub (opens in a new tab)

• duo-media

  Video and audio playback on iPhone Duo, Apple's foldable. Use when an app plays video or audio and must keep playing through fold, unfold and rotation, when you build a tabletop player (video above the fold, the same controls below) or a book-pose player, an up next queue, Picture in Picture, Now Playing or background audio. Covers one AVPlayer owned above the layout switch (VideoPlayer, AVPlayer…

  plugins/duology-features/skills/duo-media/SKILL.md on GitHub (opens in a new tab)

• duo-reading

  Builds reading and document screens for iPhone Duo, Apple's foldable: one page on the closed outer display, two facing pages split at the fold when the phone is open and held wide or folded like a book, and in tabletop the page above the fold with page turns below it. Use when you build an e-reader, a long-form or PDF viewer, notes beside a document, or when a reader loses its place on fold, unfo…

  plugins/duology-features/skills/duo-reading/SKILL.md on GitHub (opens in a new tab)

• duo-swiftui-27

  The iOS 27 SwiftUI changes that matter on iPhone Duo, Apple's foldable, where every fold, unfold and rotation resizes the app. Use it when building with Xcode 27.1 breaks a view (@State macro, ContentBuilder, TN3211), when a grid or list that reflows between the outer and inner display needs drag to reorder or swipe actions, or when you adopt the new tab, toolbar, dialog or AsyncImage APIs in a D…

  plugins/duology-features/skills/duo-swiftui-27/SKILL.md on GitHub (opens in a new tab)

• duo-system-surfaces

  Widgets, Live Activities, StandBy and Controls for apps on iPhone Duo, Apple's foldable. Use it when you build or check a widget extension, a Live Activity, a Dynamic Island presentation, a StandBy layout or a Control Center or Lock Screen control, and the app runs on iPhone Duo. Covers the redesigned Dynamic Island in the side column of the outer and inner display, which grows down that column a…

  plugins/duology-features/skills/duo-system-surfaces/SKILL.md on GitHub (opens in a new tab)

• recipe-finance-dashboard

  Creates a complete SwiftUI personal finance dashboard for iPhone Duo, Apple's foldable: balance and recent spending in one column on the closed outer display; balance, a Swift Charts spending chart and the transaction list side by side on the open inner display; an even 8-column grid with the fold as its middle gutter (DuoColumns and PaneFrames from duo-design-system); and list-detail for a trans…

  plugins/duology-recipes/skills/recipe-finance-dashboard/SKILL.md on GitHub (opens in a new tab)

• recipe-media-player

  Creates a complete SwiftUI video and podcast player for iPhone Duo, Apple's foldable: a library list-detail, a full-screen player whose playback survives every fold, unfold and rotation, a tabletop layout (video above the fold, the same controls below), a book layout (video leading, controls trailing), Picture in Picture, an up next card, a mini player and background audio. Use when someone wants…

  plugins/duology-recipes/skills/recipe-media-player/SKILL.md on GitHub (opens in a new tab)

• recipe-reader

  Creates a complete SwiftUI reading app for iPhone Duo, Apple's foldable: a library shelf, then one page on the closed outer display, two facing pages split at the fold when the phone is open and held wide or folded like a book, and in tabletop the page above the fold with the page turns below it. Use when someone wants to start a new e-reader, book, story, essay or long-form reading app from scra…

  plugins/duology-recipes/skills/recipe-reader/SKILL.md on GitHub (opens in a new tab)

• recipe-shop

  Creates a complete SwiftUI shop for iPhone Duo, Apple's foldable, that sells digital packs and a subscription with StoreKit 2: a product grid with even columns that reflows from 2 per row on the closed outer display to 4 on the open inner display with the fold as its middle gutter, product detail beside the grid when open, a basket that checks out one App Store purchase at a time, and a two-pane…

  plugins/duology-recipes/skills/recipe-shop/SKILL.md on GitHub (opens in a new tab)

• recipe-two-player-game

  Creates a complete two-player, one-phone SwiftUI game for iPhone Duo, Apple's foldable, where each player gets half the screen in every pose (closed on the outer display, open on the inner display, upright or sideways, partly folded). Use when someone wants to start a new two-player game or shared-screen app from scratch (a new Xcode project), or runs /duo-new recipe-two-player-game. For an exist…

  plugins/duology-recipes/skills/recipe-two-player-game/SKILL.md on GitHub (opens in a new tab)

• duo-lint

  The fold linter for iPhone Duo, Apple's foldable with an outer display and an inner display. Run it to find code Apple says to remove before an app runs on the foldable; it reports each finding with the fix for its rule. Catches UIScreen.main and UIScreen.screens, UIDevice.current.orientation, statusBarOrientation, the deprecated interfaceOrientation properties and effectiveGeometry.interfaceOrie…

  plugins/duology-ship/skills/duo-lint/SKILL.md on GitHub (opens in a new tab)

• duo-pose-matrix

  Screenshots an iPhone Duo app in every pose (closed, open, book, tabletop) on the iPhone Duo simulator by pressing Device Hub's pose buttons through the macOS Accessibility API, then writes summary.md and summary.json to review with the duo-design-review checklist. Use when asked to check, test or screenshot an app in each pose, fold or hinge state, to capture outer and inner display frames for a…

  plugins/duology-ship/skills/duo-pose-matrix/SKILL.md on GitHub (opens in a new tab)

• duo-testing

  Writes and runs tests for iPhone Duo apps, Apple's foldable with an outer display and an inner display, on the Mac and on the iPhone Duo simulator in Xcode 27.1. Use when adding logic tests (swiftc script, or Swift Testing with @Test and #expect), UI tests with XCTest and XCUIAutomation, launch arguments such as -uiTesting, -resetState and jump-to-screen switches with a TestSupport type, test mar…

  plugins/duology-ship/skills/duo-testing/SKILL.md on GitHub (opens in a new tab)

• duo-continuity

  Keeps app state alive when iPhone Duo, Apple's foldable, folds, unfolds, rotates or resizes between the outer display and the inner display. Use when scroll position, video or audio playback, typed text, keyboard focus, selection, form input, the selected item, the navigation stack, an upload or sign-in resets or reloads on fold or unfold, and when writing or reviewing @Observable models, @SceneS…

  plugins/duology/skills/duo-continuity/SKILL.md on GitHub (opens in a new tab)

• duo-layout

  Core layout rules for iPhone Duo, Apple's foldable. Use when content lands in the fold, a screen breaks on the inner or outer display, or you write SwiftUI or UIKit layout for a foldable. Covers size classes instead of UIScreen.main, idiom or orientation, asymmetric safe areas and margins, reserved regions (ReservedRegion, reservedRegions(kind:options:), .division, .occlusion, .includeInactive),…

  plugins/duology/skills/duo-layout/SKILL.md on GitHub (opens in a new tab)

• duo-navigation

  Gets toolbars, navigation bars, tab bars, split views and sheets right on iPhone Duo, Apple's foldable, where bars move into one vertical bar on the side of the outer display and of the inner display in landscape. Use it when bars go vertical, items overflow or vanish, an app draws its own custom bottom bar (UIToolbar, or a SwiftUI row in safeAreaInset or an overlay), toolbar or Menu buttons are…

  plugins/duology/skills/duo-navigation/SKILL.md on GitHub (opens in a new tab)

• duo-scenes

  Scenes and windows on iPhone Duo, Apple's foldable. Use when an app opens a second window (openWindow, WindowGroup(for:), activateSceneSession, UISceneSessionActivationRequest, UIWindowScene.ActivationAction), handles new-window requests on the outer display and their errors, asks before a window closes (closureConfirmation), runs in 50/50 Split View, shows content on the outer display while the…

  plugins/duology/skills/duo-scenes/SKILL.md on GitHub (opens in a new tab)

• duo-setup

  Sets up a Mac to build, run and test apps for iPhone Duo, the foldable iPhone with an outer display and an inner display, covering Xcode 27.1 next to an older Xcode with DEVELOPER_DIR (no sudo xcode-select), xcodebuild -version, the iOS 27.1 SDK and runtime, the iPhone Duo simulator in Device Hub (xcrun simctl create/bootstatus, a screenshot of each display, the Closed / Partially Open / Open pos…

  plugins/duology/skills/duo-setup/SKILL.md on GitHub (opens in a new tab)

• duo-start

  Entry point for iPhone Duo, Apple's foldable with an outer display, an inner display and a fold; use it first when someone asks to get an app ready for iPhone Duo, make it work on the foldable or survive fold and unfold, or doesn't know which Duology skill to load. It detects SwiftUI or UIKit, new or existing app, the Xcode and iOS SDK the app builds with (iOS 26, 27 or 27.1 behaviour on Duo), th…

  plugins/duology/skills/duo-start/SKILL.md on GitHub (opens in a new tab)

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