diff --git a/sharedUI/src/commonMain/kotlin/com/livrets/ui/SwipeBack.kt b/sharedUI/src/commonMain/kotlin/com/livrets/ui/SwipeBack.kt
new file mode 100644
index 0000000..8166a3a
--- /dev/null
+++ b/sharedUI/src/commonMain/kotlin/com/livrets/ui/SwipeBack.kt
@@ -0,0 +1,15 @@
+package com.livrets.ui
+
+import androidx.compose.ui.unit.dp
+
+object SwipeBackGesture {
+    val EdgeZone = 24.dp
+    const val CommitRatio = 0.4f
+    const val CommitVelocityDpPerSec = 1000f
+
+    fun shouldCommit(offsetPx: Float, containerWidthPx: Float, velocityDpPerSec: Float): Boolean {
+        if (containerWidthPx <= 0f) return false
+        return offsetPx / containerWidthPx > CommitRatio ||
+            velocityDpPerSec >= CommitVelocityDpPerSec
+    }
+}
diff --git a/sharedUI/src/commonTest/kotlin/com/livrets/ui/SwipeBackGestureTest.kt b/sharedUI/src/commonTest/kotlin/com/livrets/ui/SwipeBackGestureTest.kt
new file mode 100644
index 0000000..2c9a035
--- /dev/null
+++ b/sharedUI/src/commonTest/kotlin/com/livrets/ui/SwipeBackGestureTest.kt
@@ -0,0 +1,52 @@
+package com.livrets.ui
+
+import kotlin.test.Test
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class SwipeBackGestureTest {
+
+    @Test
+    fun `commit si l offset depasse 40 pourcent de la largeur`() {
+        assertTrue(
+            SwipeBackGesture.shouldCommit(
+                offsetPx = 401f,
+                containerWidthPx = 1000f,
+                velocityDpPerSec = 0f,
+            )
+        )
+    }
+
+    @Test
+    fun `pas de commit si offset et velocite sous les seuils`() {
+        assertFalse(
+            SwipeBackGesture.shouldCommit(
+                offsetPx = 399f,
+                containerWidthPx = 1000f,
+                velocityDpPerSec = 999f,
+            )
+        )
+    }
+
+    @Test
+    fun `commit par velocite seule meme avec offset nul`() {
+        assertTrue(
+            SwipeBackGesture.shouldCommit(
+                offsetPx = 0f,
+                containerWidthPx = 1000f,
+                velocityDpPerSec = 1000f,
+            )
+        )
+    }
+
+    @Test
+    fun `pas de commit si la largeur n est pas connue`() {
+        assertFalse(
+            SwipeBackGesture.shouldCommit(
+                offsetPx = 500f,
+                containerWidthPx = 0f,
+                velocityDpPerSec = 2000f,
+            )
+        )
+    }
+}