litter

Native iOS + Android client for Codex and Local Studio. Connect to local or remote servers, manage sessions, and run agentic coding workflows from your phone.

Screenshots (iOS)

Quick Start

make ios-device-fast   # fast device build
make ios-sim-fast      # fast simulator build
make android-emulator-fast  # fast Android emulator build

Fresh Checkout Prerequisites

After pairing a new Apple Watch with Xcode (Window → Devices and Simulators), run this once so CLI builds can install LitterWatch on it:

make watch-register

This registers the watch UDID with Apple's developer portal and refreshes the provisioning profile. Without it, xcodebuild succeeds but devicectl ... install app fails with "App could not be installed at this time". The target is idempotent (stamped per-UDID under .build-stamps/), so re-runs are no-ops until a new watch is paired. Override discovery with WATCH_UDID=<udid> if auto-detection fails.

See docs/DEVELOPMENT.md for prerequisites, full build options, TestFlight/App Store release, and SSH setup.

Repository Layout

apps/ios/                  iOS app (Litter scheme, project.yml is source of truth)
apps/android/              Android app (Compose UI, Gradle build)
shared/rust-bridge/
  codex-mobile-client/     Shared Rust client crate + UniFFI surface (iOS & Android)
  codex-slingshot/         Slingshot HTTP/stream transport
  uniffi-bindgen/          Local binding generator wrapper
shared/third_party/codex/  Upstream Codex submodule
shared/third_party/ghostty Upstream Ghostty submodule for the terminal renderer
patches/codex/             Local patch set applied during builds
tools/scripts/             Cross-platform helper scripts

Architecture

Both platforms share a single Rust core (codex-mobile-client) via UniFFI-generated bindings. Platform code (Swift/Kotlin) stays thin: UI, permissions, notifications, and platform APIs only. Session state, streaming, hydration, reconnect, SSH, and auth logic live in Rust.

See docs/ARCHITECTURE.md for ownership boundaries, runtime flows, generated-code rules, and the main maintenance risks.

Contributing

Litter is under active development and a lot of features are in flight. PRs are welcome but will likely only be merged if they're small and target a specific problem — sweeping refactors and new features tend to collide with work already underway. See CONTRIBUTING.md before opening one.

License

Litter is licensed under the GNU General Public License version 3 with an additional permission under GPLv3 section 7 for Apple App Store and Google Play distribution. See LICENSE.

Make Targets