A cross-platform app to display cryptocurrency prices, built using Kotlin Multiplatform and Compose Multiplatform. The app targets Android, iOS, and Desktop (JVM) platforms.

Features

• View real-time cryptocurrency prices.
• Offline first.
• Cross-platform support: Android, iOS, and Desktop.
• Coroutine and Flow for asynchronous operations.
• Comprehensive testing with Maestro and JUnit.
• Test coverage reports with Kover.

Tech Stack

• Kotlin Multiplatform: Share code between Android, iOS, and Desktop.
• Compose Multiplatform: Build UI across platforms with Jetpack Compose.
• Multi-module clean architecture: Maintainable and scalable project structure.
• Koin: Lightweight dependency injection framework.
• Coroutines/Flow: Asynchronous programming.
• Ktor: HTTP client.
• SQLDelight: Type-safe SQL, and multiplatform persistence library.
• JUnit: Unit testing framework.
• Kover: Code coverage tool for Kotlin.
• Maestro: End-to-end test automation framework.

Architecture

The app follows the clean architecture principle, which includes:

• Domain Layer: Contains business logic.
• Data Layer: Handles data operations, including API calls and local database.
• Presentation Layer: Contains UI components built with Compose Multiplatform.

Setup and Installation

• JDK 20 to build the app
• JVM to run the desktop app
• Xcode to build the iOS app
• Recommended IDE: Intellij or Fleet
• Maestro CLI if you want to run the end to end tests.

Build the app

Android

./gradlew app-android:assembleRelease

iOS

xcodebuild \
          -workspace app-iOS/appiOS.xcodeproj/project.xcworkspace \
          -configuration Debug \
          -scheme appiOS \
          -sdk iphonesimulator \
          -derivedDataPath app-iOS/build

Desktop

./gradlew app-desktop:run

Screenshots 📸

Android

 

iOS

 

Desktop

 

Credit

Data are provided by the awesome CoinGecko API