diff --git a/networksecurity/tests/test-apps/Android.bp b/networksecurity/tests/test-apps/Android.bp
new file mode 100644
index 0000000000..2882ca74fb
--- /dev/null
+++ b/networksecurity/tests/test-apps/Android.bp
@@ -0,0 +1,34 @@
+// Copyright (C) 2025 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_team: "trendy_team_rubidium_sdk_runtime",
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+android_app {
+    name: "CertificateTransparencyDemoApp",
+
+    manifest: "AndroidManifest.xml",
+
+    resource_dirs: ["res"],
+    srcs: [
+        "src/**/*.java",
+    ],
+    static_libs: [
+        "androidx-constraintlayout_constraintlayout",
+    ],
+
+    sdk_version: "current",
+}
diff --git a/networksecurity/tests/test-apps/AndroidManifest.xml b/networksecurity/tests/test-apps/AndroidManifest.xml
new file mode 100644
index 0000000000..276eb0fa31
--- /dev/null
+++ b/networksecurity/tests/test-apps/AndroidManifest.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- /*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ -->
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.android.ctdemo">
+    <uses-permission android:name="android.permission.INTERNET" />
+    <application
+        android:allowBackup="true"
+        android:label="@string/app_name"
+        android:networkSecurityConfig="@xml/network_security_config"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.AppCompat.DayNight.NoActionBar"
+        tools:targetApi="34">
+        <profileable android:shell="true" />
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
diff --git a/networksecurity/tests/test-apps/res/layout/activity_main.xml b/networksecurity/tests/test-apps/res/layout/activity_main.xml
new file mode 100644
index 0000000000..513af95b3a
--- /dev/null
+++ b/networksecurity/tests/test-apps/res/layout/activity_main.xml
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- /*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ -->
+<androidx.constraintlayout.widget.ConstraintLayout
+  xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingLeft="16dp"
+    android:paddingRight="16dp"
+    android:paddingTop="32dp"
+    tools:context=".MainActivity">
+  <LinearLayout
+      android:layout_width="match_parent"
+      android:layout_height="match_parent"
+      android:paddingLeft="16dp"
+      android:paddingRight="16dp"
+      android:paddingTop="32dp"
+      android:orientation="vertical"
+      tools:layout_editor_absoluteX="1dp">
+    <Button
+        android:id="@+id/button_wikipedia"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Connect to wikipedia.org" />
+    <Button
+        android:id="@+id/button_valid_badssl"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Connect to sha256.badssl.com" />
+    <Button
+        android:id="@+id/button_no_sct_badssl"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Connect to no-sct.badssl.com" />
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:paddingTop="10dp"
+        android:text="this is empty" />
+  </LinearLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/networksecurity/tests/test-apps/res/values/strings.xml b/networksecurity/tests/test-apps/res/values/strings.xml
new file mode 100644
index 0000000000..3c36a8529e
--- /dev/null
+++ b/networksecurity/tests/test-apps/res/values/strings.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- /*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ -->
+<resources>
+  <string name="app_name">CTDemo</string>
+</resources>
\ No newline at end of file
diff --git a/networksecurity/tests/test-apps/res/xml/network_security_config.xml b/networksecurity/tests/test-apps/res/xml/network_security_config.xml
new file mode 100644
index 0000000000..8cd2446fcb
--- /dev/null
+++ b/networksecurity/tests/test-apps/res/xml/network_security_config.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- /*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ -->
+<network-security-config>
+  <base-config>
+    <certificateTransparency enabled="true" />
+  </base-config>
+</network-security-config>
\ No newline at end of file
diff --git a/networksecurity/tests/test-apps/src/com/android/ctdemo/MainActivity.java b/networksecurity/tests/test-apps/src/com/android/ctdemo/MainActivity.java
new file mode 100644
index 0000000000..56b56fa31d
--- /dev/null
+++ b/networksecurity/tests/test-apps/src/com/android/ctdemo/MainActivity.java
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.ctdemo;
+
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Trace;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class MainActivity extends AppCompatActivity {
+
+    Handler handler;
+    int cookie;
+
+    private void connectTo(String urlString, TextView textView) {
+        int myCookie = cookie++;
+        URL url = null;
+        long startTime = System.nanoTime();
+        Trace.beginAsyncSection("connectTo", myCookie);
+        try {
+            url = new URL(urlString);
+        } catch (MalformedURLException e) {
+            Trace.endAsyncSection("connectTo", myCookie);
+            handler.post(
+                    new Runnable() {
+                        @Override
+                        public void run() {
+                            textView.setText(e.toString());
+                        }
+                    });
+            return;
+        }
+        HttpURLConnection urlConnection = null;
+        try {
+            urlConnection = (HttpURLConnection) url.openConnection();
+        } catch (IOException e) {
+            Trace.endAsyncSection("connectTo", myCookie);
+            long estimatedTime = (System.nanoTime() - startTime) / 1000;
+            handler.post(
+                    new Runnable() {
+                        @Override
+                        public void run() {
+                            textView.setText("Failure in " + estimatedTime + " us");
+                        }
+                    });
+            return;
+        }
+        try {
+            InputStream in = new BufferedInputStream(urlConnection.getInputStream());
+            in.read();
+        } catch (IOException e) {
+            Trace.endAsyncSection("connectTo", myCookie);
+            long estimatedTime = (System.nanoTime() - startTime) / 1000;
+            handler.post(
+                    new Runnable() {
+                        @Override
+                        public void run() {
+                            textView.setText("Failure in " + estimatedTime + " us");
+                        }
+                    });
+        }
+        Trace.endAsyncSection("connectTo", myCookie);
+        long estimatedTime = (System.nanoTime() - startTime) / 1000;
+        handler.post(
+                new Runnable() {
+                    @Override
+                    public void run() {
+                        textView.setText("Success in " + estimatedTime + " us");
+                    }
+                });
+        urlConnection.disconnect();
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        ExecutorService executor = Executors.newSingleThreadExecutor();
+        handler = new Handler(Looper.getMainLooper());
+        Button buttonWikipedia = (Button) findViewById(R.id.button_wikipedia);
+        Button buttonValid = (Button) findViewById(R.id.button_valid_badssl);
+        Button buttonNoSCT = (Button) findViewById(R.id.button_no_sct_badssl);
+        final TextView textView = (TextView) findViewById(R.id.textView);
+        buttonWikipedia.setOnClickListener(
+                new View.OnClickListener() {
+                    public void onClick(View v) {
+                        executor.execute(
+                                new Runnable() {
+                                    @Override
+                                    public void run() {
+                                        connectTo("https://www.android.com", textView);
+                                    }
+                                });
+                    }
+                });
+        buttonValid.setOnClickListener(
+                new View.OnClickListener() {
+                    public void onClick(View v) {
+                        executor.execute(
+                                new Runnable() {
+                                    @Override
+                                    public void run() {
+                                        connectTo("https://sha256.badssl.com/", textView);
+                                    }
+                                });
+                    }
+                });
+        buttonNoSCT.setOnClickListener(
+                new View.OnClickListener() {
+                    public void onClick(View v) {
+                        executor.execute(
+                                new Runnable() {
+                                    @Override
+                                    public void run() {
+                                        connectTo("https://no-sct.badssl.com/", textView);
+                                    }
+                                });
+                    }
+                });
+    }
+}