diff --git a/package.json b/package.json
index a7d34fb..58556db 100644
--- a/package.json
+++ b/package.json
@@ -10,9 +10,10 @@
     "test": "npm i --silent && tsc --noEmit && eslint && vitest run --reporter=dot --silent && vite build -l error && cp dist/index.html dist/404.html && echo 'All tests passed!'",
     "deploy": "npm i --silent && npm run build && npx -y nostr-deploy-cli deploy --skip-setup",
     "android:init": "npm run android:build:apk && npx cap add android && npx cap sync android",
-    "android:sync": "npm run android:build:apk && npx cap sync android",
+    "android:sync": "npm run android:build:apk && npx cap sync android && node scripts/sync-android-version.mjs",
     "android:open": "npx cap open android",
-    "android:build": "npm run android:build:apk && npx cap sync android && cd android && ./gradlew assembleRelease",
+    "android:version": "node scripts/sync-android-version.mjs",
+    "android:build": "npm run android:build:apk && npx cap sync android && node scripts/sync-android-version.mjs && cd android && ./gradlew assembleRelease",
     "android:build:apk": "CAPACITOR_BUILD=1 vite build && sed -i 's|<script type=\"module\" src=\"/shakespeare_tailwind[^\"]*\\.js\"></script>||g' dist/index.html && sed -i 's|<style type=\"text/tailwindcss\">|<style>|g' dist/index.html && cp dist/index.html dist/404.html"
   },
   "dependencies": {
diff --git a/scripts/sync-android-version.mjs b/scripts/sync-android-version.mjs
new file mode 100644
index 0000000..5d94c94
--- /dev/null
+++ b/scripts/sync-android-version.mjs
@@ -0,0 +1,53 @@
+#!/usr/bin/env node
+/**
+ * Sync the Android app version from package.json into android/app/build.gradle.
+ *
+ * Single source of truth = package.json "version" (semver, e.g. "1.0.92").
+ *   - versionName  ← the semver string verbatim  ("1.0.92")
+ *   - versionCode  ← a monotonic integer derived as
+ *                      major*10000 + minor*100 + patch  ("1.0.92" → 10092)
+ *
+ * This runs automatically before `npm run android:build`, so you only ever
+ * bump ONE number (package.json) and never hit Zapstore's "already exists".
+ *
+ * If android/ hasn't been generated yet (fresh checkout), it exits quietly.
+ */
+import { readFileSync, writeFileSync, existsSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const root = join(dirname(fileURLToPath(import.meta.url)), '..');
+const gradlePath = join(root, 'android', 'app', 'build.gradle');
+
+if (!existsSync(gradlePath)) {
+  console.log('[sync-android-version] android/ not generated yet — skipping.');
+  process.exit(0);
+}
+
+const pkg = JSON.parse(readFileSync(join(root, 'package.json'), 'utf8'));
+const version = String(pkg.version || '').trim();
+
+const m = version.match(/^(\d+)\.(\d+)\.(\d+)/);
+if (!m) {
+  console.error(`[sync-android-version] package.json version "${version}" is not semver (x.y.z).`);
+  process.exit(1);
+}
+
+const [, major, minor, patch] = m.map(Number);
+const versionName = version;
+const versionCode = major * 10000 + minor * 100 + patch;
+
+let gradle = readFileSync(gradlePath, 'utf8');
+
+const beforeCode = gradle.match(/versionCode\s+(\d+)/)?.[1];
+const beforeName = gradle.match(/versionName\s+"([^"]+)"/)?.[1];
+
+gradle = gradle
+  .replace(/versionCode\s+\d+/, `versionCode ${versionCode}`)
+  .replace(/versionName\s+"[^"]+"/, `versionName "${versionName}"`);
+
+writeFileSync(gradlePath, gradle);
+
+console.log(
+  `[sync-android-version] ${beforeName} (${beforeCode}) → ${versionName} (${versionCode})`,
+);