Iphone Duo Design

Iphone Duo Design is an agent skill and toolkit for building iOS apps that fit the outer and inner displays of iPhone Duo.

This product provides an agent skill and toolkit for building iOS apps that work across the compact outer display and large inner display of iPhone Duo. It covers size classes, resizable layouts, side-moving bars, reserved regions around the fold, split views, and multitasking. The toolkit includes a Swift scanner to flag layout issues, SwiftUI and UIKit templates, an offline visual previewer, HIG summaries, and a design review checklist. It integrates with Claude Code, Cursor, and OpenAI Codex. The project is open source under the MIT license.

Iphone Duo Design at a glance

Best for: Software engineer, Designer
Runs on: Web, macOS, Windows, Linux, iOS, Android, CLI, self-hosted, open source
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: github.com/belweave/iphone-duo-design

Key features

Swift scanner to flag layout and display issues
SwiftUI and UIKit layout templates
Offline visual previewer for screenshots and layouts
Hig summary and API index references
Step-by-step app migration guide
Scored design review rubric and checklist
Behavior and trigger evals for the skill

Use it for

Building iOS apps for dual-screen iPhone Duo layouts
Linting Swift code for display and fold compliance
Previewing app layouts across outer and inner display frames
Checking app designs against an HIG review rubric

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