serve-sim-apple-simulator
serve-sim — Apple Simulator Hosting Tool
Skill by ara.so — Daily 2026 Skills collection.
serve-sim is the npx serve of Apple Simulators. It spawns a Swift helper that captures a booted iOS Simulator's framebuffer via simctl io, exposes it as an MJPEG stream + WebSocket control channel, and serves a React preview UI in your browser. Works with any booted iOS Simulator — no Xcode plugin, no app instrumentation required.
Requirements
- macOS with Xcode command line tools installed (
xcrun simctlmust be available) - At least one booted iOS Simulator
- Node.js / npm (for
npx)
Quick Start
# Start preview server (auto-detects booted simulator)
npx serve-sim
# → Preview at http://localhost:3200
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