diff --git a/README.md b/README.md
index bbd3e2b..ecc0b78 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ The app demonstrates:
 - embedding `ConvoKitConversation` from `app.convokit:convokit-android-ui` in an Android Views application with `ComposeView`;
 - delegating message history, sending, editing and deleting your own messages, quoted replies and jump-to-message, media rendering, typing and read receipts to the reusable UI library;
 - calling the 0.9.0 core surface directly from the host: sending with `replyToMessageId`, resolving a whole page of quoted rows with one `getReplyPreviews` call, centring a window with `getMessageContext`, and telling the coded `MESSAGE_NOT_FOUND` and `CONVERSATION_NOT_FOUND` answers apart;
+- calling the reaction core API directly: add/remove one exact `👍🏽`, read a batched summary, and load the first page of reactors, while the embedded UI handles its own reaction controls;
 - creating an adapter after each successful login and disposing the old conversation before disconnecting or switching users.
 
 The sample no longer maintains a second message renderer, composer, or raw
@@ -36,9 +37,9 @@ The host handles system-bar, display-cutout and keyboard insets before embedding
 Compose, so padding is not applied twice. Local host tests use Robolectric and
 synthetic insets; they do not prove hosted authorization or physical-device chat.
 
-### Published 0.9.0 SDKs
+### Published 0.10.0 SDKs
 
-The example consumes the published 0.9.0 core and UI from maven.convokit.app.
+The example consumes the published 0.10.0 core and UI from maven.convokit.app.
 The embedded room acknowledges a concrete message for precise read positions,
 defers acknowledgements while the host is hidden, correlates pending sends
 with live/history confirmations before HTTP returns, and sends the caller's
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 1a56b94..e2815ac 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -40,8 +40,8 @@ android {
 }
 
 dependencies {
-    implementation("app.convokit:convokit-android:0.9.0")
-    implementation("app.convokit:convokit-android-ui:0.9.0")
+    implementation("app.convokit:convokit-android:0.10.0")
+    implementation("app.convokit:convokit-android-ui:0.10.0")
     implementation("androidx.activity:activity-ktx:1.10.1")
     implementation("androidx.appcompat:appcompat:1.7.1")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.9.1")
diff --git a/app/src/main/kotlin/app/convokit/example/MainActivity.kt b/app/src/main/kotlin/app/convokit/example/MainActivity.kt
index 7e1776d..1220e41 100644
--- a/app/src/main/kotlin/app/convokit/example/MainActivity.kt
+++ b/app/src/main/kotlin/app/convokit/example/MainActivity.kt
@@ -72,6 +72,7 @@ class MainActivity : AppCompatActivity() {
         onBackPressedDispatcher.addCallback(this, roomBack)
         binding.joinButton.setOnClickListener { joinRoom() }
         binding.replyDemoButton.setOnClickListener { runReplyDemo() }
+        binding.reactionDemoButton.setOnClickListener { runReactionDemo() }
     }
 
     private fun joinRoom() {
@@ -106,6 +107,7 @@ class MainActivity : AppCompatActivity() {
                 joinedRoomId = roomId
                 binding.replyDemoStatus.setText(R.string.reply_demo_hint)
                 binding.replyDemoButton.isEnabled = true
+                binding.reactionDemoButton.isEnabled = true
                 roomBack.isEnabled = true
             } catch (cause: Throwable) {
                 withContext(NonCancellable) { convoKit.disconnectUser() }
@@ -124,6 +126,7 @@ class MainActivity : AppCompatActivity() {
         binding.chatContent.disposeComposition()
         binding.room.visibility = View.GONE
         binding.replyDemoButton.isEnabled = false
+        binding.reactionDemoButton.isEnabled = false
         joinedRoomId = null
         binding.joinForm.visibility = View.VISIBLE
         binding.status.text = getString(R.string.disconnecting)
@@ -160,6 +163,38 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
+    /** Direct core API tour. The Compose conversation handles its own picker and chips. */
+    private fun runReactionDemo() {
+        val roomId = joinedRoomId ?: return
+        binding.reactionDemoButton.isEnabled = false
+        binding.reactionDemoStatus.setText(R.string.reaction_demo_running)
+        lifecycleScope.launch {
+            try {
+                val newest = convoKit.getMessages(roomId, limit = 1).firstOrNull()
+                val report = if (newest == null) {
+                    getString(R.string.reaction_demo_empty)
+                } else {
+                    val emoji = "👍🏽" // Preserve the exact Unicode sequence, including its skin tone.
+                    val added = convoKit.addReaction(newest.id, emoji)
+                    val summary = convoKit.getReactionSummaries(roomId, listOf(newest.id))
+                        .firstOrNull()?.reactions?.find { it.emoji == emoji }
+                    val reactors = convoKit.listReactionUsers(newest.id, emoji, limit = 10)
+                    val removed = convoKit.removeReaction(newest.id, emoji)
+                    "Added $emoji to ${newest.id}: changed=${added.changed}; " +
+                        "count=${summary?.count ?: 0}, reactedByMe=${summary?.reactedByMe ?: false}; " +
+                        "reactors on first page=${reactors.data.size}, next page=${reactors.nextCursor != null}; " +
+                        "removed: changed=${removed.changed}."
+                }
+                if (joinedRoomId == roomId) binding.reactionDemoStatus.text = report
+            } catch (cause: Throwable) {
+                if (cause is CancellationException) throw cause
+                if (joinedRoomId == roomId) binding.reactionDemoStatus.setText(R.string.reaction_demo_failed)
+            } finally {
+                binding.reactionDemoButton.isEnabled = joinedRoomId != null
+            }
+        }
+    }
+
     private suspend fun issueUserToken(appUserId: String): String {
         val response = postJson(
             "${BuildConfig.DEMO_BACKEND_URL}/api/auth/token".toHttpUrl(),
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 1621878..6b39680 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -107,6 +107,22 @@
                     android:textColor="@color/convokit_text"
                     android:textSize="13sp" />
             </ScrollView>
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/reaction_demo_button"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dp"
+                android:enabled="false"
+                android:text="@string/reaction_demo" />
+            <TextView
+                android:id="@+id/reaction_demo_status"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="4dp"
+                android:accessibilityLiveRegion="polite"
+                android:text="@string/reaction_demo_hint"
+                android:textColor="@color/convokit_text"
+                android:textSize="13sp" />
         </LinearLayout>
     </LinearLayout>
 </FrameLayout>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2a6a2d3..2e08a4d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -16,4 +16,9 @@
     <string name="reply_demo_hint">Quotes the newest message, resolves every quoted row on the page in one call, centres a window on the quote and shows the two 404s a host must tell apart. Running it sends one message to this room.</string>
     <string name="reply_demo_running">Running the quoted-reply demo…</string>
     <string name="reply_demo_failed">The quoted-reply demo could not reach ConvoKit. Check your connection and try again.</string>
+    <string name="reaction_demo">Run the reaction API demo</string>
+    <string name="reaction_demo_hint">Adds and removes one 👍🏽 on the newest message, reads its batched summary, and pages the reactor list. The conversation above handles reactions automatically.</string>
+    <string name="reaction_demo_running">Running the reaction API demo…</string>
+    <string name="reaction_demo_empty">This room has no message to react to yet.</string>
+    <string name="reaction_demo_failed">The reaction API demo could not reach ConvoKit. Check access and try again.</string>
 </resources>