diff --git a/README.ko.md b/README.ko.md
index 01a50579..f6eab3ab 100644
--- a/README.ko.md
+++ b/README.ko.md
@@ -120,7 +120,7 @@ Source-Available License 1.0을 따른다. compatibility canary는 비공개·
 때만 만든다 (명세 §8):
 `@devslab/dds-tokens` (✅ 2026-08-13) → `dds-css` v1 인벤토리 (Core 6종 ✅ 2026-08-13, +13종 ✅ 2026-08-15) →
 AskLinq 적용 → `dds-icons` (✅ 2026-08-15) → `dds-solid` + `site-kit` → 안드로이드 네이티브 값·테마·모션
-(0.6.0, 2026-11-12, Maven Central — 테마·모션·부품·아이콘). 0.7.0(2026-11-13, Maven Central)에서 화면 틀과 `dds-compose-testing` 꾸러미가 생겼다(D-052). 0.8.0(2026-11-13)에서 `DdsSegmentedControl`이 생겼고, 0.8.1에서 어두운 화면의 고른 칸이 밝아졌고(`bg.raised`, D-054), 0.9.0에서 고른 면이 미끄러져 옮겨 간다(D-055). RN·Ionic 패키지는 그 제품이 생길 때.
+(0.6.0, 2026-11-12, Maven Central — 테마·모션·부품·아이콘). 0.7.0(2026-11-13, Maven Central)에서 화면 틀과 `dds-compose-testing` 꾸러미가 생겼다(D-052). 0.8.0(2026-11-13)에서 `DdsSegmentedControl`이 생겼고, 0.8.1에서 어두운 화면의 고른 칸이 밝아졌고(`bg.raised`, D-054), 0.9.0에서 고른 면이 미끄러져 옮겨 가고(D-055), 0.9.1에서 앱이 그 속도를 정할 수 있다. RN·Ionic 패키지는 그 제품이 생길 때.
 
 ## 입력·선택·공유 달력 확장
 
diff --git a/README.md b/README.md
index 9531b98c..03184428 100644
--- a/README.md
+++ b/README.md
@@ -124,7 +124,7 @@ Priorities live in [`docs/backlog.md`](docs/backlog.md). Packages are created
 only when a consumer exists (spec §8):
 `@devslab/dds-tokens` (✅ 2026-08-13) → `dds-css` v1 inventory (Core 6 ✅ 2026-08-13, +13 ✅ 2026-08-15) →
 AskLinq adoption → `dds-icons` (✅ 2026-08-15) → `dds-solid` + `site-kit` → native Android values, theme and motion
-(0.6.0, 2026-11-12, on Maven Central — theme, motion, components, icons). 0.7.0 (2026-11-13, on Maven Central) adds the screen frame and the `dds-compose-testing` artifact (D-052). 0.8.0 (2026-11-13) adds `DdsSegmentedControl`, 0.8.1 its lighter chosen face in dark (`bg.raised`, D-054), and 0.9.0 makes that face slide between choices (D-055). RN and Ionic packages only when such a product exists.
+(0.6.0, 2026-11-12, on Maven Central — theme, motion, components, icons). 0.7.0 (2026-11-13, on Maven Central) adds the screen frame and the `dds-compose-testing` artifact (D-052). 0.8.0 (2026-11-13) adds `DdsSegmentedControl`, 0.8.1 its lighter chosen face in dark (`bg.raised`, D-054), 0.9.0 makes that face slide between choices (D-055), and 0.9.1 lets an app set the slide speed. RN and Ionic packages only when such a product exists.
 
 ## Input, choice and shared calendar additions
 
diff --git a/android/CHANGELOG.ko.md b/android/CHANGELOG.ko.md
index af50db5d..01979734 100644
--- a/android/CHANGELOG.ko.md
+++ b/android/CHANGELOG.ko.md
@@ -5,6 +5,14 @@
 `kr.devslab:dds-android-tokens`, `kr.devslab:dds-compose`, 그리고 0.7.0부터 `kr.devslab:dds-compose-testing`은 한 버전을 쓰고, 웹 패키지와는
 버전이 따로다(D-048). 릴리스는 `android-v<버전>` 태그로 낸다.
 
+## 0.9.1 — 2026-11-13
+
+**새로 생긴 것**
+
+- **`DdsSegmentedControl(slideAnimationSpec = …)`, `DdsSegmentedDefaults.SlideAnimationSpec`** — 고른 면이 옮겨 가는
+  속도를 앱이 정한다. 기본값은 0.9.0과 같은 200ms `Standard`이고, 바꾸고 싶은 앱만 `tween(…)` 등을 넘긴다. 기기에서
+  애니메이션을 끄면 넘긴 값과 상관없이 바로 옮겨 간다. 기존 호출은 그대로다.
+
 ## 0.9.0 — 2026-11-13
 
 **바뀐 것**
diff --git a/android/CHANGELOG.md b/android/CHANGELOG.md
index 8c5099fd..53734ee0 100644
--- a/android/CHANGELOG.md
+++ b/android/CHANGELOG.md
@@ -5,6 +5,14 @@
 `kr.devslab:dds-android-tokens`, `kr.devslab:dds-compose` and (from 0.7.0) `kr.devslab:dds-compose-testing` share one version,
 separate from the web packages (D-048). Releases are cut by an `android-v<version>` tag.
 
+## 0.9.1 — 2026-11-13
+
+**New**
+
+- **`DdsSegmentedControl(slideAnimationSpec = …)`, `DdsSegmentedDefaults.SlideAnimationSpec`** — an app sets how fast the
+  chosen face travels. The default is 0.9.0's 200ms `Standard`; only an app that wants another passes a `tween(…)` or any
+  spec. With animations off on the device the face moves at once, whatever is passed. Existing calls are unchanged.
+
 ## 0.9.0 — 2026-11-13
 
 **Changed**
diff --git a/android/README.ko.md b/android/README.ko.md
index c8092a41..034e762d 100644
--- a/android/README.ko.md
+++ b/android/README.ko.md
@@ -26,8 +26,8 @@ dependencies {
 
 ```kotlin
 dependencies {
-    implementation("kr.devslab:dds-compose:0.9.0")
-    androidTestImplementation("kr.devslab:dds-compose-testing:0.9.0")
+    implementation("kr.devslab:dds-compose:0.9.1")
+    androidTestImplementation("kr.devslab:dds-compose-testing:0.9.1")
 }
 ```
 
diff --git a/android/README.md b/android/README.md
index d5263d6c..bc05aca0 100644
--- a/android/README.md
+++ b/android/README.md
@@ -26,8 +26,8 @@ dependencies {
 
 ```kotlin
 dependencies {
-    implementation("kr.devslab:dds-compose:0.9.0")
-    androidTestImplementation("kr.devslab:dds-compose-testing:0.9.0")
+    implementation("kr.devslab:dds-compose:0.9.1")
+    androidTestImplementation("kr.devslab:dds-compose-testing:0.9.1")
 }
 ```
 
diff --git a/android/dds-compose/src/androidTest/kotlin/kr/devslab/dds/compose/SegmentedOnDeviceTest.kt b/android/dds-compose/src/androidTest/kotlin/kr/devslab/dds/compose/SegmentedOnDeviceTest.kt
index 505444ea..e4d69727 100644
--- a/android/dds-compose/src/androidTest/kotlin/kr/devslab/dds/compose/SegmentedOnDeviceTest.kt
+++ b/android/dds-compose/src/androidTest/kotlin/kr/devslab/dds/compose/SegmentedOnDeviceTest.kt
@@ -37,6 +37,8 @@ import androidx.compose.ui.test.onNodeWithTag
 import androidx.compose.ui.test.onNodeWithText
 import androidx.compose.ui.test.performClick
 import androidx.compose.ui.text.TextLayoutResult
+import androidx.compose.animation.core.LinearEasing
+import androidx.compose.animation.core.tween
 import androidx.compose.ui.unit.dp
 import kotlin.math.abs
 import kr.devslab.dds.compose.component.DdsSegment
@@ -255,6 +257,33 @@ class SegmentedOnDeviceTest {
         assertEquals("end width", to.width, end.width, 1f)
     }
 
+    @Test
+    fun anAppCanSlowTheSlideDown() {
+        assumeFalse("animations are turned off on this device", isReducedMotion(InstrumentationRegistry.getInstrumentation().targetContext))
+        var chosen by mutableStateOf("person")
+        show {
+            DdsSegmentedControl(
+                kinds,
+                chosen,
+                { chosen = it },
+                contentDescription = "종류",
+                fullWidth = true,
+                slideAnimationSpec = tween(1_000, easing = LinearEasing),
+            )
+        }
+        val from = segment("개인")
+        val to = segment("비즈니스")
+        rule.mainClock.autoAdvance = false
+        rule.onNodeWithText("비즈니스").performClick()
+        // Past the default 200ms, the app's 1s slide is still about a third of the way.
+        rule.mainClock.advanceTimeBy(350)
+        val midway = thumb()
+        assertTrue("still travelling at 350ms: $midway", midway.left > from.left + 1f && midway.left < to.left - 1f)
+        rule.mainClock.autoAdvance = true
+        rule.waitForIdle()
+        assertEquals("it ends on the new segment", to.left, thumb().left, 1f)
+    }
+
     @Test
     fun noChoiceDrawsNoFace() {
         show { DdsSegmentedControl(kinds, "nothing", {}, contentDescription = "종류") }
diff --git a/android/dds-compose/src/main/kotlin/kr/devslab/dds/compose/component/Segmented.kt b/android/dds-compose/src/main/kotlin/kr/devslab/dds/compose/component/Segmented.kt
index 67bc3861..c3589185 100644
--- a/android/dds-compose/src/main/kotlin/kr/devslab/dds/compose/component/Segmented.kt
+++ b/android/dds-compose/src/main/kotlin/kr/devslab/dds/compose/component/Segmented.kt
@@ -31,6 +31,7 @@ import androidx.compose.ui.draw.shadow
 import androidx.compose.ui.layout.Layout
 import androidx.compose.ui.platform.testTag
 import androidx.compose.animation.core.Animatable
+import androidx.compose.animation.core.AnimationSpec
 import androidx.compose.animation.core.tween
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.mutableIntStateOf
@@ -39,6 +40,7 @@ import androidx.compose.runtime.setValue
 import kotlin.math.roundToInt
 import kotlinx.coroutines.launch
 import kr.devslab.dds.compose.motion.DdsMotion
+import kr.devslab.dds.compose.motion.rememberReducedMotion
 import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.error
@@ -83,8 +85,9 @@ public class DdsSegment<out T>(
  *   one is a `bg.raised` face with a 1dp `border.strong` line, a level-1
  *   shadow, `text.primary` and weight 600.
  * - **Motion:** the chosen face slides to the new choice (200ms, standard
- *   easing), growing or shrinking to its width; the label colors fade. With
- *   animations off on the device it moves at once. The first frame already
+ *   easing, unless the app passes its own [slideAnimationSpec]), growing or
+ *   shrinking to its width; the label colors fade. With animations off on the
+ *   device it moves at once, whatever spec is passed. The first frame already
  *   shows it on the chosen segment.
  * - **Height:** one size, the web's touch height. The track is 50dp (48dp
  *   inside its line); each segment is 48dp of touch with a 44dp face and is
@@ -115,6 +118,10 @@ public class DdsSegment<out T>(
  * @param enabled false greys out the whole control and ignores touches
  * @param readOnly shows the choice, can be focused and read, but cannot be
  * changed. Not greyed out
+ * @param slideAnimationSpec how the chosen face travels to a new choice: 200ms
+ * with the standard easing by default ([DdsSegmentedDefaults.SlideAnimationSpec]).
+ * An app may pass its own (a slower `tween`, say). With animations turned off on
+ * the device the face moves at once, whatever is passed here
  */
 @Composable
 public fun <T> DdsSegmentedControl(
@@ -128,6 +135,7 @@ public fun <T> DdsSegmentedControl(
     error: String? = null,
     enabled: Boolean = true,
     readOnly: Boolean = false,
+    slideAnimationSpec: AnimationSpec<Float> = DdsSegmentedDefaults.SlideAnimationSpec,
 ) {
     checkSegments(segments) // a handful of segments: cheap enough on every composition
     val colors = DdsTheme.colors
@@ -146,6 +154,7 @@ public fun <T> DdsSegmentedControl(
             fullWidth = fullWidth,
             touch = touch,
             chosen = segments.indexOfFirst { it.value == selected },
+            slide = segmentSlide(slideAnimationSpec, reducedMotion = rememberReducedMotion()),
             modifier = Modifier
                 .then(if (fullWidth) Modifier.fillMaxWidth() else Modifier)
                 // Disabled dims the track as a whole (the web's `[data-disabled]` track).
@@ -188,14 +197,22 @@ public fun <T> DdsSegmentedControl(
  * otherwise each is as wide as it wants (it sits inside a horizontal scroll).
  *
  * The chosen face is one thumb behind the segments, not a face on each (D-055):
- * choosing another segment slides it there, growing or shrinking to that
- * segment's width on the way, over [DdsMotion.Base] with the standard easing —
- * the web's indicator and [DdsTabs]'s underline move the same way. The first
- * layout, and a new place for the same choice (rotation, font size), put it
- * there without travel. [chosen] is -1 when no segment is chosen: no thumb.
+ * choosing another segment slides it there by [slide], growing or shrinking to
+ * that segment's width on the way — by default over [DdsMotion.Base] with the
+ * standard easing, as the web's indicator and [DdsTabs]'s underline move. The
+ * first layout, and a new place for the same choice (rotation, font size), put
+ * it there without travel; so does a null [slide] (animations off). [chosen] is
+ * -1 when no segment is chosen: no thumb.
  */
 @Composable
-private fun SegmentRow(fullWidth: Boolean, touch: Int, chosen: Int, modifier: Modifier, content: @Composable () -> Unit) {
+private fun SegmentRow(
+    fullWidth: Boolean,
+    touch: Int,
+    chosen: Int,
+    slide: AnimationSpec<Float>?,
+    modifier: Modifier,
+    content: @Composable () -> Unit,
+) {
     // Where each segment starts and ends, in px from the start edge. Written when the row is
     // placed; read when the choice changes, never while the row is measured.
     var spans by remember { mutableStateOf<List<IntRange>>(emptyList()) }
@@ -207,11 +224,10 @@ private fun SegmentRow(fullWidth: Boolean, touch: Int, chosen: Int, modifier: Mo
         span ?: return@LaunchedEffect
         val start = span.first.toFloat()
         val end = (span.last + 1).toFloat()
-        if (thumbFor == chosen || thumbFor == -1) {
+        if (thumbFor == chosen || thumbFor == -1 || slide == null) {
             thumbStart.snapTo(start)
             thumbEnd.snapTo(end)
         } else {
-            val slide = tween<Float>(DdsMotion.Base, easing = DdsMotion.Standard)
             launch { thumbStart.animateTo(start, slide) }
             launch { thumbEnd.animateTo(end, slide) }
         }
@@ -379,6 +395,23 @@ private fun Segment(
     }
 }
 
+/** The default values of [DdsSegmentedControl]. */
+public object DdsSegmentedDefaults {
+    /**
+     * How the chosen face travels to a new choice: [DdsMotion.Base] (200ms) with the
+     * [DdsMotion.Standard] easing — the same move as the web's indicator and [DdsTabs]'s
+     * underline (D-055).
+     */
+    public val SlideAnimationSpec: AnimationSpec<Float> = tween(DdsMotion.Base, easing = DdsMotion.Standard)
+}
+
+/**
+ * The slide the thumb uses, or null to move at once. Animations turned off on the device win
+ * over any spec an app passes: the face then moves at once.
+ */
+internal fun segmentSlide(spec: AnimationSpec<Float>, reducedMotion: Boolean): AnimationSpec<Float>? =
+    if (reducedMotion) null else spec
+
 internal fun checkSegments(segments: List<DdsSegment<*>>) {
     require(segments.isNotEmpty()) { "DdsSegmentedControl: segments must not be empty" }
     val seen = HashSet<Any?>()
diff --git a/android/dds-compose/src/test/kotlin/kr/devslab/dds/compose/component/SegmentedTest.kt b/android/dds-compose/src/test/kotlin/kr/devslab/dds/compose/component/SegmentedTest.kt
index 1e26dd43..86aaa98d 100644
--- a/android/dds-compose/src/test/kotlin/kr/devslab/dds/compose/component/SegmentedTest.kt
+++ b/android/dds-compose/src/test/kotlin/kr/devslab/dds/compose/component/SegmentedTest.kt
@@ -1,5 +1,8 @@
 package kr.devslab.dds.compose.component
 
+import androidx.compose.animation.core.tween
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertSame
 import org.junit.Assert.assertThrows
 import org.junit.Test
 
@@ -27,4 +30,17 @@ class SegmentedTest {
     fun theSameLabelOnTwoValuesIsAllowed() {
         checkSegments(listOf(DdsSegment(1, "A"), DdsSegment(2, "A")))
     }
+
+    @Test
+    fun theSlideAnAppPassesIsTheOneUsed() {
+        val slow = tween<Float>(600)
+        assertSame(slow, segmentSlide(slow, reducedMotion = false))
+        assertSame(DdsSegmentedDefaults.SlideAnimationSpec, segmentSlide(DdsSegmentedDefaults.SlideAnimationSpec, reducedMotion = false))
+    }
+
+    @Test
+    fun withAnimationsOffTheFaceMovesAtOnceWhateverTheAppPassed() {
+        assertNull(segmentSlide(tween(600), reducedMotion = true))
+        assertNull(segmentSlide(DdsSegmentedDefaults.SlideAnimationSpec, reducedMotion = true))
+    }
 }
diff --git a/android/gradle.properties b/android/gradle.properties
index 7c2d7723..9b7e64d4 100644
--- a/android/gradle.properties
+++ b/android/gradle.properties
@@ -8,4 +8,4 @@ kotlin.code.style=official
 # Android releases are versioned apart from the web packages (docs/decisions.md D-048).
 # The release workflow overrides VERSION_NAME from the android-v* tag.
 GROUP=kr.devslab
-VERSION_NAME=0.9.0
+VERSION_NAME=0.9.1
diff --git a/docs/mobile-native.ko.md b/docs/mobile-native.ko.md
index bcdb32c3..2e5e8bf7 100644
--- a/docs/mobile-native.ko.md
+++ b/docs/mobile-native.ko.md
@@ -904,7 +904,9 @@ Compose 벡터는 `dds-icons`의 SVG에서 **생성**한다(`node scripts/genera
 - **고른 면은 미끄러져 옮겨 간다(0.9.0, D-055).** 칸마다 면을 그리지 않고 행 뒤에 면 하나를 둔다. 다른 칸을
   고르면 200ms(`DdsMotion.Base`, `Standard` 곡선)에 걸쳐 그 칸으로 가며 폭도 따라 바뀐다 — `DdsTabs` 밑줄과 같다.
   처음 그릴 때와 회전·글자 크기로 자리만 바뀔 때는 움직이지 않는다. 기기에서 애니메이션을 끄면 바로 옮겨 간다.
-  웹도 같다.
+  웹도 같다. **속도는 앱이 정할 수 있다(0.9.1):** 기본값은 그대로 두고, 앱이
+  `slideAnimationSpec = tween(400, easing = DdsMotion.Standard)`처럼 넘기면 그 값으로 움직인다(기본값은
+  `DdsSegmentedDefaults.SlideAnimationSpec`). 기기에서 애니메이션을 껐으면 넘긴 값과 상관없이 바로 옮겨 간다.
 - **고른 칸은 트랙보다 밝은 면이다(0.8.1, D-054).** 카드·메뉴의 그림자는 뺐지만(§10의 5번) 이
   면은 웹 그대로 1단계 그림자를 쓴다. 어두운 화면에서는 그림자가 보이지 않으므로 면 자체가 트랙
   (`bg.subtle` `zinc.900`)보다 한 단계 밝은 `bg.raised`(`zinc.800`)다. 0.8.0은 `bg.default`
diff --git a/docs/mobile-native.md b/docs/mobile-native.md
index b513fc98..d8af8779 100644
--- a/docs/mobile-native.md
+++ b/docs/mobile-native.md
@@ -950,7 +950,11 @@ end-aligned menu).
   segment. Choosing another segment moves it there over 200ms (`DdsMotion.Base`, the `Standard`
   easing), its width following — as `DdsTabs`'s underline moves. The first layout, and a new
   place for the same choice (rotation, font size), put it there without travel. With animations
-  off on the device it moves at once. The web does the same.
+  off on the device it moves at once. The web does the same. **An app can set the speed (0.9.1):**
+  the default stays, and an app that passes, say, `slideAnimationSpec = tween(400, easing =
+  DdsMotion.Standard)` gets that move instead (the default is
+  `DdsSegmentedDefaults.SlideAnimationSpec`). With animations off on the device the face still
+  moves at once, whatever is passed.
 - **The chosen face is lighter than the track (0.8.1, D-054).** Cards and menus dropped their
   shadow (§10 no. 5), but this face keeps the web's level-1 shadow. In the dark theme, where the
   shadow does not show, the face itself is `bg.raised` (`zinc.800`), one step lighter than the