The sonner of Compose Multiplatform — a toast / snackbar / notification library that's callable from anywhere, beautiful by default, and feature-complete.
Android · iOS · Desktop (JVM) · Web (Wasm)
Most toast libraries make you thread a SnackbarHostState through your composables. Krumb doesn't. Call it from a ViewModel, a coroutine, a click handler — anywhere:
Toaster.success("Profile saved")It draws its own Compose UI on every platform — not android.widget.Toast, not an OS banner — so a toast looks and behaves identically on Android, iOS, Desktop, and Web.
| Best DX | One-liner global API · zero-config setup · promise pattern · callable from anywhere |
| Best visuals | Depth-stacked toasts · spring animations · swipe-to-dismiss · pause-on-hover · progress bar |
| Best features | Priority queue · update-by-handle · action buttons · custom composable content · programmatic dismiss |
| Platform | Target | Status |
|---|---|---|
| Android | androidTarget() |
✅ |
| iOS | iosX64 / iosArm64 / iosSimulatorArm64 |
✅ |
| Desktop | jvm |
✅ |
| Web | wasmJs |
✅ |
In gradle/libs.versions.toml:
[versions]
krumb = "0.1.1"
[libraries]
krumb-material3 = { module = "io.github.nadeemiqbal:krumb-material3", version.ref = "krumb" }In your shared module's commonMain (the material3 artifact transitively pulls in krumb-compose + krumb-core):
commonMain.dependencies {
implementation(libs.krumb.material3)
}Not on Material 3? Depend on
io.github.nadeemiqbal:krumb-composedirectly and supply your ownKrumbStyle.
Wrap your app once, near the root:
@Composable
fun App() {
MaterialTheme {
Material3ToasterHost {
// your app content
}
}
}That's it — no state to hoist, no host to pass around.
// One-liners — callable from anywhere
Toaster.success("Profile saved")
Toaster.error("Network failed")
Toaster.info("3 new messages")
Toaster.warning("Battery low")
val handle = Toaster.loading("Uploading…") // returns a handle
// Builder + action button
Toaster.show("Deleted item") {
action("Undo") { viewModel.undo() }
duration = 5.seconds
position = ToastPosition.BottomCenter
}
// Promise — loading → success / error automatically
Toaster.promise(
block = { repository.save() },
loading = "Saving…",
success = { "Saved successfully" },
error = { e -> "Failed: ${e.message}" },
)
// Fully custom composable content
Toaster.custom(duration = 4.seconds) {
Row { /* anything you want */ }
}
// Programmatic control
handle.update(message = "Done", type = ToastType.Success)
handle.dismiss()
Toaster.dismissAll()Toasts beyond maxVisible are queued. Priority.HIGH jumps ahead and preempts the oldest LOW toast on screen:
Toaster.show("Critical alert") { priority = Priority.HIGH }| Artifact | Description |
|---|---|
krumb-core |
Pure-Kotlin engine — queue, controller, Toaster facade. No UI dependency, fully unit-tested. |
krumb-compose |
ToasterHost composable — stacking, spring animations, swipe-to-dismiss, pause-on-hover, progress bar, custom content. |
krumb-material3 |
Material 3 themed defaults — semantic success/error/warning colors, theme-aware info/loading. |
The sample/ directory has runnable showcases for every platform, all driven by one shared SampleApp():
./gradlew :sample:desktopApp:run # Desktop
./gradlew :sample:androidApp:installDebug # Android
./gradlew :sample:webApp:webBrowserDevelopmentRun # Web → localhost:8080
# iOS: open sample/iosApp/iosApp.xcodeproj in Xcode and runIssues and PRs welcome — see CONTRIBUTING.md. Maintainer release process is in RELEASING.md.
Copyright 2026 Nadeem Iqbal
Licensed under the Apache License, Version 2.0 — see the LICENSE file.