diff --git a/formulus/android/app/build.gradle b/formulus/android/app/build.gradle
index df7c7386b..9a4330d38 100644
--- a/formulus/android/app/build.gradle
+++ b/formulus/android/app/build.gradle
@@ -148,6 +148,11 @@ android {
     packagingOptions {
         pickFirst '**/libc++_shared.so' // for watermelondb JSI fastness
     }
+
+    dependenciesInfo {
+        includeInApk false
+        includeInBundle false
+    }
 }
 
 dependencies {
diff --git a/formulus/package.json b/formulus/package.json
index c57e82c46..9ce911323 100644
--- a/formulus/package.json
+++ b/formulus/package.json
@@ -6,7 +6,8 @@
   "private": true,
   "license": "MIT",
   "scripts": {
-    "preandroid": "pnpm run vendor:notifee",
+    "preandroid": "pnpm run vendor:notifee && pnpm run patch:android-foss",
+    "postinstall": "node scripts/patch-android-foss.mjs",
     "android": "react-native run-android",
     "ios": "react-native run-ios",
     "lint": "eslint . --max-warnings 9999",
@@ -20,6 +21,7 @@
     "generate_qr": "tsx scripts/generateQR.ts",
     "sync:version": "node scripts/syncNativeVersion.js",
     "vendor:notifee": "node scripts/vendor-notifee-core.mjs",
+    "patch:android-foss": "node scripts/patch-android-foss.mjs",
     "prebuild": "pnpm run sync:version && pnpm run generate"
   },
   "dependencies": {
diff --git a/formulus/scripts/patch-android-foss.mjs b/formulus/scripts/patch-android-foss.mjs
new file mode 100644
index 000000000..d31a6c0e2
--- /dev/null
+++ b/formulus/scripts/patch-android-foss.mjs
@@ -0,0 +1,187 @@
+/**
+ * Patches Android dependencies in node_modules for F-Droid / FOSS builds:
+ * - @react-native-community/geolocation: no Play Services (framework LocationManager only)
+ * - react-native-device-info: no install referrer / Firebase / Play Services Gradle deps
+ *
+ * Re-run after npm/pnpm install. Bump version pins when upgrading those packages.
+ */
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const repoRoot = path.join(__dirname, '..');
+
+/** Must match resolved versions in package-lock.json */
+const GEOLOCATION_VERSION = '3.4.0';
+const DEVICE_INFO_VERSION = '15.0.2';
+
+const geolocationRoot = path.join(
+  repoRoot,
+  'node_modules',
+  '@react-native-community',
+  'geolocation',
+);
+const deviceInfoGradle = path.join(
+  repoRoot,
+  'node_modules',
+  'react-native-device-info',
+  'android',
+  'build.gradle',
+);
+
+function read(relPath) {
+  return fs.readFileSync(relPath, 'utf8');
+}
+
+function write(relPath, content) {
+  fs.writeFileSync(relPath, content, 'utf8');
+}
+
+function assertPackageVersion(pkgDir, packageName, expectedVersion) {
+  const pkgJsonPath = path.join(pkgDir, 'package.json');
+  if (!fs.existsSync(pkgJsonPath)) {
+    throw new Error(
+      `${packageName} not found at ${pkgDir}. Run npm/pnpm install first.`,
+    );
+  }
+  const version = JSON.parse(read(pkgJsonPath)).version;
+  if (version !== expectedVersion) {
+    throw new Error(
+      `Expected ${packageName}@${expectedVersion}, found ${version}. Update patch-android-foss.mjs version pin.`,
+    );
+  }
+}
+
+function patchGeolocation() {
+  assertPackageVersion(
+    geolocationRoot,
+    '@react-native-community/geolocation',
+    GEOLOCATION_VERSION,
+  );
+
+  const gradlePath = path.join(geolocationRoot, 'android', 'build.gradle');
+  let gradle = read(gradlePath);
+  const gradleMarker = '// FOSS: Play Services location removed';
+  if (!gradle.includes(gradleMarker)) {
+    gradle = gradle.replace(
+      /^\s*implementation\s+'com\.google\.android\.gms:play-services-location:[^']+'\s*\n/m,
+      `  ${gradleMarker}\n`,
+    );
+    if (gradle.includes('play-services-location')) {
+      throw new Error('Failed to remove play-services-location from geolocation build.gradle');
+    }
+    write(gradlePath, gradle);
+    console.log('patched geolocation android/build.gradle');
+  }
+
+  const playServicesJava = path.join(
+    geolocationRoot,
+    'android',
+    'src',
+    'main',
+    'java',
+    'com',
+    'reactnativecommunity',
+    'geolocation',
+    'PlayServicesLocationManager.java',
+  );
+  if (fs.existsSync(playServicesJava)) {
+    fs.unlinkSync(playServicesJava);
+    console.log('removed PlayServicesLocationManager.java');
+  }
+
+  const modulePath = path.join(
+    geolocationRoot,
+    'android',
+    'src',
+    'main',
+    'java',
+    'com',
+    'reactnativecommunity',
+    'geolocation',
+    'GeolocationModule.java',
+  );
+  let moduleSrc = read(modulePath);
+  const moduleMarker = '// FOSS: Android LocationManager only';
+  if (!moduleSrc.includes(moduleMarker)) {
+    moduleSrc = moduleSrc.replace(
+      `import com.google.android.gms.common.ConnectionResult;
+import com.google.android.gms.common.GoogleApiAvailability;
+
+`,
+      '',
+    );
+    moduleSrc = moduleSrc.replace(
+      `  private void onConfigurationChange(Configuration config) {
+    ReactApplicationContext reactContext = mLocationManager.mReactContext;
+    if (Objects.equals(config.locationProvider, "android") && mLocationManager instanceof PlayServicesLocationManager) {
+      mLocationManager = new AndroidLocationManager(reactContext);
+    } else if (Objects.equals(config.locationProvider, "playServices") && mLocationManager instanceof AndroidLocationManager) {
+      GoogleApiAvailability availability = new GoogleApiAvailability();
+      if (availability.isGooglePlayServicesAvailable(reactContext.getApplicationContext()) == ConnectionResult.SUCCESS) {
+        mLocationManager = new PlayServicesLocationManager(reactContext);
+      }
+    }
+  }`,
+      `  private void onConfigurationChange(Configuration config) {
+    ${moduleMarker}
+  }`,
+    );
+    if (moduleSrc.includes('com.google.android.gms')) {
+      throw new Error('GeolocationModule.java still references Google Play Services');
+    }
+    if (moduleSrc.includes('PlayServicesLocationManager')) {
+      throw new Error('GeolocationModule.java still references PlayServicesLocationManager');
+    }
+    write(modulePath, moduleSrc);
+    console.log('patched GeolocationModule.java');
+  }
+}
+
+function patchDeviceInfo() {
+  const deviceInfoRoot = path.join(repoRoot, 'node_modules', 'react-native-device-info');
+  assertPackageVersion(deviceInfoRoot, 'react-native-device-info', DEVICE_INFO_VERSION);
+
+  let gradle = read(deviceInfoGradle);
+  const marker = '// FOSS: proprietary Android deps removed';
+  if (gradle.includes(marker)) {
+    return;
+  }
+
+  gradle = gradle.replace(
+    /^\s*implementation\s+"com\.android\.installreferrer:installreferrer:[^"]+"\s*\n/m,
+    '',
+  );
+  gradle = gradle.replace(
+    /\n {2}def firebaseBomVersion[\s\S]*?(?=\n {2}testImplementation)/,
+    `\n  ${marker}\n`,
+  );
+  if (gradle.includes('installreferrer') || gradle.includes('firebase-iid')) {
+    throw new Error('device-info build.gradle still lists proprietary dependencies');
+  }
+  write(deviceInfoGradle, gradle);
+  console.log('patched react-native-device-info android/build.gradle');
+}
+
+function fixGradleCommentSyntax(filePath) {
+  if (!fs.existsSync(filePath)) return;
+  const content = read(filePath);
+  if (content.includes('# FOSS:')) {
+    write(filePath, content.replaceAll('# FOSS:', '// FOSS:'));
+    console.log(`fixed Gradle comment syntax in ${path.relative(repoRoot, filePath)}`);
+  }
+}
+
+function main() {
+  if (!fs.existsSync(path.join(repoRoot, 'node_modules'))) {
+    throw new Error('node_modules missing. Run pnpm install or npm install in formulus/ first.');
+  }
+  patchGeolocation();
+  patchDeviceInfo();
+  fixGradleCommentSyntax(path.join(geolocationRoot, 'android', 'build.gradle'));
+  fixGradleCommentSyntax(deviceInfoGradle);
+  console.log('android FOSS patches applied.');
+}
+
+main();