Mobile Dev is a Codex plugin for developing and debugging Android and iOS applications alongside a Codex desktop chat. It supports Expo, React Native, SwiftUI, and other native mobile projects, and can stream iOS simulators, Android emulators, and connected devices into a device panel.
The plugin provides device selection and booting, taps, drags, text input, accessibility inspection, screen or element annotations, and MCP-based app control. It combines iOS unified logs, Android logcat, and Metro messages; logs can be searched, filtered, scoped to the foreground app, and sent to chat with an error stack trace. Its performance tools record CPU and memory activity, thread charts, display FPS, Android frame-pacing and jank statistics, and selected interaction ranges for comparison and analysis in Codex.
The prebuilt distribution targets Codex desktop on Apple Silicon Macs and includes bundled runtimes. It is installed through Codex's plugin marketplace and requires the relevant Xcode, Android SDK, simulator, emulator, or device tooling. The repository is maintained by Callstack's incubator organization.