diff --git a/.github/workflows/release-android.yml b/.github/workflows/release-android.yml
index e1fd068..5443349 100644
--- a/.github/workflows/release-android.yml
+++ b/.github/workflows/release-android.yml
@@ -145,7 +145,7 @@ jobs:
 
   # ─── JOB 2: PRODUCTION BUILD (requires manual approval) ─────────────
   build-production:
-    name: Build and Deploy Production AAB
+    name: Build and Deploy Production APK
     environment: production
     runs-on: ubuntu-latest
     needs: build-staging
@@ -221,18 +221,15 @@ jobs:
           sudo rm -rf /usr/share/dotnet /usr/local/share/powershell /usr/share/swift /opt/ghc /opt/hostedtoolcache/CodeQL
           df -h
 
-      - name: Build production AAB
+      - name: Build production APK
         env:
           KEYSTORE_PATH: ${{ runner.temp }}/mapswipe-prod.keystore
           STORE_PASSWORD: ${{ secrets.ANDROID_PRODUCTION_KEYSTORE_PASSWORD }}
           KEY_ALIAS: ${{ secrets.ANDROID_PRODUCTION_KEY_ALIAS }}
           KEY_PASSWORD: ${{ secrets.ANDROID_PRODUCTION_KEY_PASSWORD }}
-        # bundleRelease produces an Android App Bundle for the Play Store. No
-        # -PreactNativeArchitectures override, so all ABIs are included and Play
-        # splits per device. The prod keystore signs it as the upload key; Play
-        # App Signing re-signs the delivered APKs.
         run: |
-          cd android && ./gradlew bundleRelease --stacktrace \
+          cd android && ./gradlew assembleRelease --stacktrace \
+            -PreactNativeArchitectures=armeabi-v7a,arm64-v8a \
             -Pandroid.injected.signing.store.file=$KEYSTORE_PATH \
             -Pandroid.injected.signing.store.password=$STORE_PASSWORD \
             -Pandroid.injected.signing.key.alias=$KEY_ALIAS \
@@ -247,11 +244,11 @@ jobs:
             echo "tag=dev-$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
           fi
 
-      - name: Rename AAB
+      - name: Rename APK
         run: |
           mkdir -p generated
-          cp android/app/build/outputs/bundle/release/app-release.aab \
-            generated/mapswipe-${{ steps.tag.outputs.tag }}.aab
+          cp android/app/build/outputs/apk/release/app-release.apk \
+            generated/mapswipe-${{ steps.tag.outputs.tag }}.apk
 
       - name: Publish production release
         env:
@@ -261,15 +258,14 @@ jobs:
             --title "MapSwipe Mobile ${{ steps.tag.outputs.tag }}" \
             --notes "## MapSwipe Mobile ${{ steps.tag.outputs.tag }}
 
-          ### 🚀 Play Store release
-          1. Download the AAB below
-          2. Upload it to the Play Console production track (Google re-signs it via Play App Signing)
-          3. Review and roll out the release
+          ### 📱 Install
+          1. Download the APK below
+          2. Enable 'Install from unknown sources' in Android settings
+          3. Install
 
           ### 🔧 Build info
           - Commit: \`${{ github.sha }}\`
           - Build: #${{ github.run_number }}
           - Date: $(date +'%Y-%m-%d %H:%M:%S UTC')
-          - Package: \`org.missingmaps.mapswipe\`
-          - Artifact: Android App Bundle (.aab), signed with the upload key" \
-            generated/mapswipe-${{ steps.tag.outputs.tag }}.aab
+          - Package: \`org.missingmaps.mapswipe\`" \
+            generated/mapswipe-${{ steps.tag.outputs.tag }}.apk
diff --git a/app.prod.json b/app.prod.json
index 984aa5e..f0184d4 100644
--- a/app.prod.json
+++ b/app.prod.json
@@ -26,6 +26,7 @@
             },
             "predictiveBackGestureEnabled": false,
             "package": "org.missingmaps.mapswipe",
+            "versionCode": 3000100,
             "userInterfaceStyle": "light"
         },
         "web": {
diff --git a/app.staging.json b/app.staging.json
index 7b2fa0a..3ee890a 100644
--- a/app.staging.json
+++ b/app.staging.json
@@ -26,6 +26,7 @@
             },
             "predictiveBackGestureEnabled": false,
             "package": "org.missingmaps.mapswipe.dev",
+            "versionCode": 3000100,
             "userInterfaceStyle": "light"
         },
         "web": {
diff --git a/deploy.sh b/deploy.sh
index be8fc40..f752d61 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -25,6 +25,7 @@ REMOTE="origin"
 DEVELOP_BRANCH="develop"
 VERSION_FILES=(package.json app.prod.json app.staging.json)
 BUILDNUMBER_FILES=(app.prod.json app.staging.json)
+VERSIONCODE_FILES=(app.prod.json app.staging.json)   # android.versionCode, derived from version+build
 
 # ── Pretty output ───────────────────────────────────────────────────────
 if [[ -t 1 ]]; then
@@ -154,6 +155,13 @@ read -rp "$(printf '%sNew build number%s [current: %s]: ' "$BOLD" "$RESET" "$cur
 [[ "$new_build" =~ ^[0-9]+$ ]] \
     || die "Build number must be a non-negative integer (got '$new_build')."
 
+# Android versionCode: one monotonic integer derived from version + build, using
+# the legacy MapSwipe scheme (major*1000000 + minor*10000 + patch*100 + build).
+# The 1e6 scale keeps 3.x codes above the old 2.x app already live on Play.
+# Assumes minor, patch and build each stay < 100 (10# forces base-10 on zeros).
+IFS=. read -r vc_major vc_minor vc_patch <<< "$new_version"
+new_version_code=$(( 10#$vc_major * 1000000 + 10#$vc_minor * 10000 + 10#$vc_patch * 100 + 10#$new_build ))
+
 read -rp "$(printf '%sOne-line release description:%s ' "$BOLD" "$RESET")" description
 description="${description#"${description%%[![:space:]]*}"}"   # ltrim
 description="${description%"${description##*[![:space:]]}"}"     # rtrim
@@ -187,6 +195,9 @@ fi
 if [[ "$mode" == "test" && "$new_version" != "$current_version" ]]; then
     warnings+=("Test release changes the version. This lands on '$DEVELOP_BRANCH' (directly, or via merge) — version bumps belong to production releases.")
 fi
+if (( 10#$vc_minor >= 100 || 10#$vc_patch >= 100 || 10#$new_build >= 100 )); then
+    warnings+=("versionCode formula assumes minor/patch/build < 100; a component is ≥ 100, so the derived code ($new_version_code) may collide with a neighbouring version. Revisit the scheme.")
+fi
 
 # ── 7. Summary + confirm ─────────────────────────────────────────────────
 printf '\n%s%s┌─ Release summary ─────────────────────────────────┐%s\n' "$BOLD" "$CYAN" "$RESET"
@@ -194,6 +205,7 @@ printf   '%s│%s  mode         %s%s%s\n'                "$CYAN" "$RESET" "$BOLD
 printf   '%s│%s  branch       %s\n'                    "$CYAN" "$RESET" "$current_branch"
 printf   '%s│%s  version      %s → %s%s%s\n'           "$CYAN" "$RESET" "$current_version" "$BOLD" "$new_version" "$RESET"
 printf   '%s│%s  buildNumber  %s → %s%s%s\n'           "$CYAN" "$RESET" "$current_build" "$BOLD" "$new_build" "$RESET"
+printf   '%s│%s  versionCode  %s%s%s  %s(android, derived)%s\n' "$CYAN" "$RESET" "$BOLD" "$new_version_code" "$RESET" "$DIM" "$RESET"
 printf   '%s│%s  commit       %s%s%s\n'                "$CYAN" "$RESET" "$DIM" "$commit_subject" "$RESET"
 printf   '%s│%s  tag          %s%s%s  (annotated)\n'   "$CYAN" "$RESET" "$BOLD" "$tag" "$RESET"
 printf   '%s│%s  push         %s → %s\n'               "$CYAN" "$RESET" "$push_target" "$REMOTE"
@@ -225,6 +237,11 @@ for f in "${BUILDNUMBER_FILES[@]}"; do
     perl -i -pe 's/("buildNumber"\s*:\s*")[^"]*(")/${1}'"$new_build"'${2}/' "$f"
 done
 
+info "Setting android.versionCode to $new_version_code…"
+for f in "${VERSIONCODE_FILES[@]}"; do
+    perl -i -pe 's/("versionCode"\s*:\s*)[0-9]+/${1}'"$new_version_code"'/' "$f"
+done
+
 info "Committing…"
 git add "${VERSION_FILES[@]}"
 git commit --quiet -m "$commit_subject"