diff --git a/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index 374a5715..19917389 100644
--- a/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -6,4 +6,9 @@
       android:drawable="@mipmap/ic_launcher_foreground"
       android:inset="22%"/>
   </foreground>
+  <monochrome>
+    <inset
+      android:drawable="@mipmap/ic_launcher_monochrome"
+      android:inset="22%"/>
+  </monochrome>
 </adaptive-icon>
\ No newline at end of file
diff --git a/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-hdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-hdpi/ic_launcher_monochrome.png
new file mode 100644
index 00000000..c43676db
Binary files /dev/null and b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-hdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-mdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-mdpi/ic_launcher_monochrome.png
new file mode 100644
index 00000000..413aacf6
Binary files /dev/null and b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-mdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xhdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xhdpi/ic_launcher_monochrome.png
new file mode 100644
index 00000000..83783a71
Binary files /dev/null and b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xhdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xxhdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xxhdpi/ic_launcher_monochrome.png
new file mode 100644
index 00000000..86343cfe
Binary files /dev/null and b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xxhdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher_monochrome.png
new file mode 100644
index 00000000..c9fbb303
Binary files /dev/null and b/apps/readest-app/src-tauri/gen/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/icons/android/mipmap-hdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/icons/android/mipmap-hdpi/ic_launcher_monochrome.png
old mode 100755
new mode 100644
index 1e8dd023..c43676db
Binary files a/apps/readest-app/src-tauri/icons/android/mipmap-hdpi/ic_launcher_monochrome.png and b/apps/readest-app/src-tauri/icons/android/mipmap-hdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/icons/android/mipmap-mdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/icons/android/mipmap-mdpi/ic_launcher_monochrome.png
old mode 100755
new mode 100644
index de648c34..413aacf6
Binary files a/apps/readest-app/src-tauri/icons/android/mipmap-mdpi/ic_launcher_monochrome.png and b/apps/readest-app/src-tauri/icons/android/mipmap-mdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/icons/android/mipmap-xhdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/icons/android/mipmap-xhdpi/ic_launcher_monochrome.png
old mode 100755
new mode 100644
index a0478a4e..83783a71
Binary files a/apps/readest-app/src-tauri/icons/android/mipmap-xhdpi/ic_launcher_monochrome.png and b/apps/readest-app/src-tauri/icons/android/mipmap-xhdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/icons/android/mipmap-xxhdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/icons/android/mipmap-xxhdpi/ic_launcher_monochrome.png
old mode 100755
new mode 100644
index 5cffb08c..86343cfe
Binary files a/apps/readest-app/src-tauri/icons/android/mipmap-xxhdpi/ic_launcher_monochrome.png and b/apps/readest-app/src-tauri/icons/android/mipmap-xxhdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_monochrome.png b/apps/readest-app/src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_monochrome.png
old mode 100755
new mode 100644
index 1cdffbe8..c9fbb303
Binary files a/apps/readest-app/src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_monochrome.png and b/apps/readest-app/src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_monochrome.png differ
diff --git a/apps/readest-app/src/__tests__/android/themed-icon.test.ts b/apps/readest-app/src/__tests__/android/themed-icon.test.ts
new file mode 100644
index 00000000..220638c4
--- /dev/null
+++ b/apps/readest-app/src/__tests__/android/themed-icon.test.ts
@@ -0,0 +1,49 @@
+import { describe, it, expect } from 'vitest';
+import { existsSync, readFileSync } from 'fs';
+import { resolve } from 'path';
+
+/**
+ * Regression guard for the Android themed ("Material You" / monochrome) launcher
+ * icon (issue #4733).
+ *
+ * Android 13+ recolors the adaptive icon's `<monochrome>` layer with a
+ * wallpaper-derived tint when the user enables themed icons. Support for it was
+ * originally added in #2122/#2153 (the `ic_launcher_monochrome.png` assets) and
+ * wired into the source adaptive icon, but #2353 ("fixed Android launcher icon
+ * size") rewrote the *committed* `gen/` adaptive icon to inset the foreground
+ * and silently dropped the `<monochrome>` layer — so themed icons stopped
+ * working in shipped builds.
+ *
+ * The CI/release flow regenerates `gen/android` from scratch
+ * (`tauri android init` + `tauri icon`) and then `git checkout .` to restore the
+ * *tracked* customizations. `tauri icon` does not emit a monochrome layer, so
+ * the themed icon only survives if both the adaptive-icon XML and the
+ * monochrome mipmaps are tracked under `gen/`.
+ *
+ * Invariants:
+ *  1. The committed adaptive icon declares a `<monochrome>` layer pointing at
+ *     `@mipmap/ic_launcher_monochrome`.
+ *  2. A tracked `ic_launcher_monochrome.png` exists for every launcher density
+ *     so the resource resolves at build time (these are force-added past the
+ *     `gen/` .gitignore, like the other customized resources).
+ */
+
+const appRoot = process.cwd();
+const resRoot = resolve(appRoot, 'src-tauri/gen/android/app/src/main/res');
+
+const DENSITIES = ['mdpi', 'hdpi', 'xhdpi', 'xxhdpi', 'xxxhdpi'];
+
+describe('Android themed (monochrome) launcher icon', () => {
+  it('declares a <monochrome> layer in the adaptive icon', () => {
+    const xml = readFileSync(resolve(resRoot, 'mipmap-anydpi-v26/ic_launcher.xml'), 'utf8');
+    expect(xml).toMatch(/<monochrome\b/);
+    expect(xml).toMatch(/@mipmap\/ic_launcher_monochrome/);
+  });
+
+  it('ships a tracked monochrome mipmap for every density', () => {
+    const missing = DENSITIES.filter(
+      (d) => !existsSync(resolve(resRoot, `mipmap-${d}`, 'ic_launcher_monochrome.png')),
+    );
+    expect(missing, `missing tracked monochrome mipmaps for: ${missing.join(', ')}`).toEqual([]);
+  });
+});