day-cli

The day command line: create, build, run, test, and package Day apps.

day new app hello       # scaffold a project (Day.toml + src/lib.rs)
day launch -p macos-appkit -p android-widget
day doctor              # what's installed, what's missing, how to fix it
day pack -p macos-appkit  # .dmg — plus .ipa / .apk+.aab / .flatpak / .msix / .hap per target

One binary drives the whole per-platform build zoo — cargo, xcodebuild, Gradle, hvigor, resource compilers, signing — so an app project needs no platform build files of its own beyond the checked-in scaffolds. A dayscript engine can drive a launched app step by step (tap, type, assert, screenshot), which is how Day's own showcase is tested on every target in CI.

Install with cargo install --locked day-cli, then day new.

Part of Day

Day builds cross-platform apps from each platform's real native widgets — AppKit, UIKit, Android, GTK 4, Qt 6, WinUI, and ArkUI — from a single Rust codebase. No web view, no bundled rendering engine: a button("Save") is an NSButton on macOS and a Material button on Android.

Start at daybrite.dev, or browse the source repository.