Native Android app for privacy-focused contact card exchange.

• Contact Card Management: Create and edit your personal contact card
• QR Exchange: Scan or display QR codes to exchange contacts in-person
• Selective Visibility: Control which contacts see which fields
• Background Sync: Automatic updates via WorkManager (15-min intervals)
• Encrypted Backup: Export/import with password-protected encryption

• Kotlin + Jetpack Compose (Material Design 3)
• UniFFI bindings to Rust core (vauchi-mobile)
• CameraX + ML Kit for QR scanning
• Android KeyStore for secure key storage

# Build and install (requires Android SDK)
./gradlew installDebug

# Or open in Android Studio

• Android SDK: Compile 35, Min 24, Target 35
• Java 17
• Rust toolchain (for building native library from source)

app/src/main/kotlin/com/vauchi/
├── MainActivity.kt      # Entry point
├── VauchiApp.kt        # Application class
├── ui/screens/          # Compose screens
├── data/                # Repository, KeyStore helper
└── viewmodels/          # ViewModel layer

This app requires the vauchi-mobile UniFFI bindings from the core repo:

# Option 1: Download from CI (when available)
# See dev-tools repo for download script

# Option 2: Build from source
git clone git@gitlab.com:vauchi/code.git ../code
cd ../code
cargo build -p vauchi-mobile --release --target aarch64-linux-android

./gradlew assembleDebug    # Debug build
./gradlew assembleRelease  # Release build
./gradlew installDebug     # Install to connected device

./gradlew test                    # Unit tests
./gradlew connectedAndroidTest    # Instrumented tests

1. Check vauchi/docs for architecture decisions
2. Follow Kotlin coding conventions and Material Design 3 guidelines
3. Write tests for new features
4. Core library changes go to vauchi/code

Vauchi is open source and community-funded — no VC money, no data harvesting.

• GitHub Sponsors
• Liberapay
• Supporters for sponsorship tiers

MIT