Simulators

Drive iOS Simulators (simctl, macOS + Xcode) and Android Emulators (adb) from a workspace tab: list/boot devices, install & launch apps, open deep links, screenshot, and (Android) tap/swipe/type, exposed as the grant-gated simulator.control capability.

The public home of ryu-simulator. Source, builds, and releases live here — binaries for every platform are attached to each release.

This tree is generated from the Ryu monorepo, so commits pushed here directly are replaced on the next sync. Pull requests are welcome — open them here and they are ported into the monorepo, then flow back out. Ryu as a whole: https://github.com/amajorai/ryu

Install

App: Install (opens the Ryu desktop app and asks you to confirm)

CLI:

ryu apps add @ryu/simulator

Source & build

The source of record for this app: a dependency-free Bun/TypeScript sidecar/ Ryu runs locally as a grant-gated control capability, plus the manifest ui/. The sidecar builds standalone — cd sidecar && bun install && bun run build compiles a single ryu-simulator executable; each release attaches the per-platform binaries.

License

Apache-2.0 — see LICENSE.

Parts

• sidecar/ — ryu-simulator (out-of-process, Node/Bun). A dependency-free control server (@ryu/simulator-sidecar) wrapping simctl + adb behind a loopback HTTP surface. No dependency on apps/core; compiled by bun build --compile into a ryu-simulator binary resolved via RYU_SIMULATOR_BIN else ryu-simulator on PATH (~/.ryu/bin). See sidecar/README.md for the full control API.
• ui/ — the manifest (manifest.json). No companion UI of its own; the desktop Simulator panel (a dedicated simulator workspace TabKind) is the consumer. runnables: [].

Manifest (manifest.json)

• Sidecar: simulator on :7994, command: "ryu-simulator", command_env: RYU_SIMULATOR_BIN, port_env: RYU_SIMULATOR_PORT, health_path: /health, lazy: true with idle_stop_secs: 300. Declared HTTP routes: /, /health, /capabilities, /devices, and per-device boot/shutdown/install/launch/openurl/screenshot/tap/swipe/text/key.
• Provides: capability simulator.control (v1.0.0) → sidecar simulator, route /, grant simulator:control.
• Grant: simulator:control.

Control parity (the honest limit)

• Android: full control — adb shell input gives tap/swipe/text/key for free.
• iOS: simctl gives boot/install/launch/openurl/screenshot cleanly, but has no public coordinate tap/swipe. Those return an unsupported result for an iOS device; adding facebook/idb is the upgrade path.

Auth / security

The sidecar binds loopback only and fail-closes: every route except GET /health requires a bearer resolved as RYU_EXT_TOKEN (Core's per-plugin secret, re-stamped on each proxied hop) else RYU_SIMULATOR_TOKEN. If neither is set, protected routes reject with 401.

Swap seam

Any control server that honors the same /devices* loopback contract and bearer auth can replace the sidecar without touching Core — the command_env override points Core at an alternative binary. The capability, not the process, is what the desktop panel and agents bind to.