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OpenAI's Build iOS Apps plugin lets Codex mirror the iOS Simulator in the in-app browser and hot-reload package-backed SwiftUI previews without leaving Codex. It packages Swift and iOS workflows -- designing App Intents and Shortcuts, building and refactoring SwiftUI, auditing performance, and debugging on simulators through XcodeBuildMCP-backed flows. The plugin is open source in OpenAI's plugins repo.
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