---
title: "Stable"
description: "Stable is used to communicate some guarantees to the compose compiler about how a certain type or function will behave."
type: "class"
lastmod: "2026-06-04T09:07:42.915371Z"
---
## API Reference

> Source set: Common

```kotlin
@MustBeDocumented
@Target(
    AnnotationTarget.CLASS,
    AnnotationTarget.FUNCTION,
    AnnotationTarget.PROPERTY_GETTER,
    AnnotationTarget.PROPERTY,
)
@StableMarker
public annotation class Stable
```

Stable is used to communicate some guarantees to the compose compiler about how a certain type or
function will behave.

When applied to a class or an interface, [Stable](/jetpack-compose/androidx.compose.runtime/runtime-annotation/classes/Stable) indicates that the following must be true:
1) The result of `equals` will always return the same result for the same two instances.
2) When a public property of the type changes, composition will be notified.
3) All public property types are stable.

When applied to a function or a property, the [Stable](/jetpack-compose/androidx.compose.runtime/runtime-annotation/classes/Stable) annotation indicates that the function
will return the same result if the same parameters are passed in. This is only meaningful if the
parameters and results are themselves [Stable](/jetpack-compose/androidx.compose.runtime/runtime-annotation/classes/Stable), [Immutable](/jetpack-compose/androidx.compose.runtime/runtime-annotation/classes/Immutable), or primitive.

The invariants that this annotation implies are used for optimizations by the compose compiler,
and have undefined behavior if the above assumptions are not met. As a result, one should not use
this annotation unless they are certain that these conditions are satisfied.