What's new in the
April '26 release.

v2 testing APIs are now the default; v1 is deprecated. The dispatcher swaps from UnconfinedTestDispatcher to StandardTestDispatcher — coroutines queue until the virtual clock advances.

• Better mimics production conditions
• Flushes out race conditions and flakes
• Migration guide & API mappings provided

Wrap your SharedTransitionLayout with LookaheadAnimationVisualDebugging to see target bounds, trajectories, and match counts at a glance.

HostDefaultProvider, LocalHostDefaultProvider, HostDefaultKey, and ViewTreeHostDefaultKey supply host-level services directly through compose-runtime.

• No more compose-ui dependency for lookups
• Better support for Kotlin Multiplatform
• Use compositionLocalWithHostDefaultOf for tree-linked defaults

Define exactly how a Compose preview is displayed. Implement PreviewWrapperProvider and annotate to inject theming and other wrapper logic — cuts repetitive preview boilerplate.

@PreviewWrapperProvider(ThemeWrapper::class)
@Preview
@Composable
private fun ButtonPreview() {
  // JetsnackTheme in effect
  Button(onClick = {}) {
    Text(text = "Demo")
  }
}

A new foundation API for customizing visual elements of components — stateful styling and animated transitions with promising performance benefits.

Button(
  onClick = { /* … */ },
  style = {
    background(Brush.linearGradient(
      listOf(lightPurple, lightBlue)
    ))
    width(75.dp)
    height(50.dp)
    externalPadding(16.dp)
    pressed {
      background(Brush.linearGradient(
        listOf(Color.Magenta, Color.Red)
      ))
    }
  }
) { Text("Login") }

Declarative, performant adaptation to the environment — window size, posture, keyboard, pointer precision. Recomposes only when needed.

@Composable
fun VideoPlayer() {
  if (mediaQuery {
    windowPosture == UiMediaScope.Posture.Tabletop
  }) {
    TabletopLayout()
  } else {
    FlatLayout()
  }
}

Complex two-dimensional layouts built from tracks, gaps, and cells. Supports Dp, percentages, intrinsic sizes, and flexible Fr units — without the overhead of a scrollable list.

High-performance adaptive layouts with wrapping, multi-axis alignment, and grow / shrink based on available container dimensions.