diff --git a/extensions-compose-experimental/api/extensions-compose-experimental.klib.api b/extensions-compose-experimental/api/extensions-compose-experimental.klib.api
index 5f7c7e4d..adae9972 100644
--- a/extensions-compose-experimental/api/extensions-compose-experimental.klib.api
+++ b/extensions-compose-experimental/api/extensions-compose-experimental.klib.api
@@ -36,7 +36,7 @@ final val com.arkivanov.decompose.extensions.compose.experimental.stack.animatio
 final val com.arkivanov.decompose.extensions.compose.experimental.stack.animation/com_arkivanov_decompose_extensions_compose_experimental_stack_animation_PredictiveBackParams$stableprop // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/com_arkivanov_decompose_extensions_compose_experimental_stack_animation_PredictiveBackParams$stableprop|#static{}com_arkivanov_decompose_extensions_compose_experimental_stack_animation_PredictiveBackParams$stableprop[0]
 
 final fun (com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator).com.arkivanov.decompose.extensions.compose.experimental.stack.animation/plus(com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/plus|plus@com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator(com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator){}[0]
-final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation(com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator = ..., kotlin/Boolean = ..., kotlin/Function1<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams?> = ...): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B> // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation|stackAnimation(com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator;kotlin.Boolean;kotlin.Function1<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.PredictiveBackParams?>){0§<kotlin.Any>;1§<kotlin.Any>}[0]
+final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation(com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator? = ..., kotlin/Boolean = ..., kotlin/Function1<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams?> = ...): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B> // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation|stackAnimation(com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator?;kotlin.Boolean;kotlin.Function1<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.PredictiveBackParams?>){0§<kotlin.Any>;1§<kotlin.Any>}[0]
 final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation(kotlin/Boolean = ..., kotlin/Function1<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams?> = ..., kotlin/Function3<com.arkivanov.decompose/Child.Created<#A, #B>, com.arkivanov.decompose/Child.Created<#A, #B>, com.arkivanov.decompose.extensions.compose.stack.animation/Direction, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator?>): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B> // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation|stackAnimation(kotlin.Boolean;kotlin.Function1<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.PredictiveBackParams?>;kotlin.Function3<com.arkivanov.decompose.Child.Created<0:0,0:1>,com.arkivanov.decompose.Child.Created<0:0,0:1>,com.arkivanov.decompose.extensions.compose.stack.animation.Direction,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator?>){0§<kotlin.Any>;1§<kotlin.Any>}[0]
 final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack/ChildStack(com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, androidx.compose.ui/Modifier?, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B>?, kotlin/Function4<androidx.compose.animation/AnimatedVisibilityScope, com.arkivanov.decompose/Child.Created<#A, #B>, androidx.compose.runtime/Composer, kotlin/Int, kotlin/Unit>, androidx.compose.runtime/Composer?, kotlin/Int, kotlin/Int) // com.arkivanov.decompose.extensions.compose.experimental.stack/ChildStack|ChildStack(com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>;androidx.compose.ui.Modifier?;com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimation<0:0,0:1>?;kotlin.Function4<androidx.compose.animation.AnimatedVisibilityScope,com.arkivanov.decompose.Child.Created<0:0,0:1>,androidx.compose.runtime.Composer,kotlin.Int,kotlin.Unit>;androidx.compose.runtime.Composer?;kotlin.Int;kotlin.Int){0§<kotlin.Any>;1§<kotlin.Any>}[0]
 final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack/ChildStack(com.arkivanov.decompose.value/Value<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>>, androidx.compose.ui/Modifier?, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B>?, kotlin/Function4<androidx.compose.animation/AnimatedVisibilityScope, com.arkivanov.decompose/Child.Created<#A, #B>, androidx.compose.runtime/Composer, kotlin/Int, kotlin/Unit>, androidx.compose.runtime/Composer?, kotlin/Int, kotlin/Int) // com.arkivanov.decompose.extensions.compose.experimental.stack/ChildStack|ChildStack(com.arkivanov.decompose.value.Value<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>>;androidx.compose.ui.Modifier?;com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimation<0:0,0:1>?;kotlin.Function4<androidx.compose.animation.AnimatedVisibilityScope,com.arkivanov.decompose.Child.Created<0:0,0:1>,androidx.compose.runtime.Composer,kotlin.Int,kotlin.Unit>;androidx.compose.runtime.Composer?;kotlin.Int;kotlin.Int){0§<kotlin.Any>;1§<kotlin.Any>}[0]
diff --git a/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/StackAnimation.kt b/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/StackAnimation.kt
index e062272d..039c520f 100644
--- a/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/StackAnimation.kt
+++ b/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/StackAnimation.kt
@@ -29,7 +29,7 @@ fun interface StackAnimation<C : Any, T : Any> {
  * @param predictiveBackParams a function that returns [PredictiveBackParams] for the specified [ChildStack],
  * or `null`. The predictive back gesture is enabled if the value returned for the specified [ChildStack]
  * is *not* `null`, and disabled if the returned value is `null`.
- * @param selector provides a [StackAnimator] for the current [Child], other [Child] and [Direction].
+ * @param selector provides an optional [StackAnimator] for the current [Child], other [Child] and [Direction].
  */
 @ExperimentalDecomposeApi
 fun <C : Any, T : Any> stackAnimation(
@@ -46,7 +46,7 @@ fun <C : Any, T : Any> stackAnimation(
 /**
  * Creates an implementation of [StackAnimation] with the provided [StackAnimator].
  *
- * @param animator a [StackAnimator] to be used for animation, default is [fade].
+ * @param animator an optional [StackAnimator] to be used for animation, default is [fade].
  * @param disableInputDuringAnimation disables input and touch events while animating, default value is `true`.
  * @param predictiveBackParams a function that returns [PredictiveBackParams] for the specified [ChildStack],
  * or `null`. The predictive back gesture is enabled if the value returned for the specified [ChildStack]
@@ -54,7 +54,7 @@ fun <C : Any, T : Any> stackAnimation(
  */
 @ExperimentalDecomposeApi
 fun <C : Any, T : Any> stackAnimation(
-    animator: StackAnimator = fade(),
+    animator: StackAnimator? = fade(),
     disableInputDuringAnimation: Boolean = true,
     predictiveBackParams: (ChildStack<C, T>) -> PredictiveBackParams? = { null },
 ): StackAnimation<C, T> =