Sim Stage

Your iOS simulator,
inside Codex.

Sim Stage keeps a live simulator open next to the chat. You and the agent use the same screen, and every new build shows up in place.

View source
Codex · brew-ios
Screen · iPhone 17 Pro
Ask Codex anything
iPhone 17 ProiOS 27 Simulator · Live 60 fps
Build 1

Install Sim Stage

Build the plugin from source and add it to Codex. Keep Xcode open with Settings → Intelligence → Model Context Protocol turned on.

  1. git clone https://github.com/rishirsv/simstage.git cd simstage
  2. bun install --frozen-lockfile bun run dev:plugin
  3. codex plugin marketplace add "$PWD/.dev-plugin" --json codex plugin add sim-stage@sim-stage-dev --json

Then start a new Codex chat and ask: “Open Sim Stage and show my simulators.”