Castella App Packaging

When to use: "package Castella app", "create executable", "bundle for distribution", "macOS app bundle", "code signing", "cross-compile"

ux (Recommended)

ux creates single executables using uv. End users don't need Python installed.

Installation

uv tool install ux-py

Basic Usage

ux bundle --project . --output ./dist/

Configuration (pyproject.toml)

[tool.ux]
entry = "your_app"
include = ["assets/"]

[tool.ux.macos]
icon = "assets/icon.png"
bundle_identifier = "com.example.yourapp"
bundle_name = "Your App"

macOS App Bundle

# Signed .app bundle
ux bundle --format app --codesign --output ./dist/

# With DMG
ux bundle --format app --codesign --dmg --output ./dist/

# With notarization
ux bundle --format app --codesign --notarize --dmg --output ./dist/

Cross-Compilation

ux bundle --target linux-x86_64 --output ./dist/
ux bundle --target windows-x86_64 --output ./dist/

Supported Targets

Target	PyPI
darwin-x86_64	Yes
darwin-aarch64	Yes
linux-x86_64	Yes
linux-aarch64	GitHub
windows-x86_64	Yes

PyInstaller

Alternative bundler:

uv add --dev pyinstaller
uv run pyinstaller --onefile --windowed your_app.py

Nuitka

Compiles Python to native code:

uv add --dev nuitka
uv run nuitka --standalone --onefile --disable-console your_app.py

Reference

• docs/packaging.md - Full packaging documentation