KMPDevicePreview is a Compose Multiplatform library for previewing and simulating your app. It lets you test your app or any part of it on different screen sizes, devices, and settings like dark mode or portrait/landscape orientation. This library works on Android, iOS, Web (WASM/Kotlin), JS and Desktop (JVM). You can even use it to create web-based demos to showcase your app online.

To use KMPDevicePreview, add the library to your build.gradle file: Latest version: .

implementation("com.kappmaker:kmpdevicepreview:<version>")

Wrap your root App composable or any view with DeviceWithConfigurationView to display a preview:

DeviceWithConfigurationView {
    App()
}

https://github.com/user-attachments/assets/6393bd5b-a148-4903-a641-5d83bbc80d1d

To preview only SimulatedDevice without any configuration view:

SimulatedDevicePreview(
    simulatedDevice = SimulatedDevice(
        device = Pixel6(), // Use a predefined device or create your own
        configuration = DeviceConfiguration(isDarkMode = true, isPortrait = true) // Set dark mode and orientation
    )
) {
    // Your composable content
    App()
}

You can create custom device size by implementing the Device interface and override its size properties, then pass it into SimulatedDevice.

Use SimulatedDeviceThemeIsDark.current for testing light/dark mode previews:

val isDark by SimulatedDeviceThemeIsDark.current
MaterialTheme(colorScheme = if (isDark) darkColorScheme() else lightColorScheme()){
    ...
}

This library is inspired by Flutter Device Preview. It brings similar functionality to the Compose Multiplatform ecosystem.