diff --git a/.github/workflows/fw-lite.yaml b/.github/workflows/fw-lite.yaml
index 97a07232d1..ff227b014b 100644
--- a/.github/workflows/fw-lite.yaml
+++ b/.github/workflows/fw-lite.yaml
@@ -247,10 +247,25 @@ jobs:
           path: backend/FwLite/artifacts/publish/FwLiteWeb/*
 
   publish-android:
-    name: Publish FW Lite app for Android
+    name: Publish FW Lite app for Android (${{ matrix.variant }})
     needs: [ build-and-test, frontend ]
     timeout-minutes: 30
     runs-on: macos-latest
+    # Two bundles for one Play listing: CoreCLR (64-bit) + Mono (armeabi-v7a) — they can't share an AAB
+    # (a bundle boots a single runtime). 64-bit devices' abilist also includes armeabi-v7a, so they match
+    # BOTH bundles; the versionCode bands CoreCLR above Mono so they resolve to CoreCLR and only 32-bit-only
+    # devices get Mono. See create-release for the upload side.
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # RIDs come from the csproj, keyed on UseMonoRuntime (see FwLiteMaui.csproj).
+          - variant: coreclr
+            runtimeArgs: ''
+            versionOffset: 100000000
+          - variant: mono
+            runtimeArgs: '-p:UseMonoRuntime=true'
+            versionOffset: 0
     steps:
       - name: Checkout
         uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
@@ -266,6 +281,10 @@ jobs:
 
       - name: Setup Maui
         run: dotnet workload install maui
+      - name: Compute Android version code
+        id: versionCode
+        shell: bash
+        run: echo "CODE=$(( ${{ matrix.versionOffset }} + ${{ github.run_number }} ))" >> ${GITHUB_OUTPUT}
       - name: Decode Android Keystore
         id: decodeKeystore
         env:
@@ -281,9 +300,9 @@ jobs:
           KEYSTORE_PASS: ${{ secrets.FW_LITE_KEYSTORE_PASS }}
           KEYSTORE_ALIAS: ${{ vars.FW_LITE_KEYSTORE_UPLOAD_KEY_ALIAS }}
         run: |
-          dotnet publish -f net10.0-android -p:BuildApple=false --artifacts-path ../artifacts \
+          dotnet publish -f net10.0-android -p:BuildApple=false --artifacts-path ../artifacts ${{ matrix.runtimeArgs }} \
             -p:ApplicationDisplayVersion=${{ needs.build-and-test.outputs.semver-version }} \
-            -p:ApplicationVersion=${{ github.run_number }} \
+            -p:ApplicationVersion=${{ steps.versionCode.outputs.CODE }} \
             -p:InformationalVersion=${{ needs.build-and-test.outputs.version }} \
             -p:AndroidKeyStore=true \
             -p:AndroidSigningKeyStore=${KEYSTORE_PATH} \
@@ -295,10 +314,11 @@ jobs:
       - name: Upload FWLite App artifacts
         uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
         with:
-          name: fw-lite-android
+          name: fw-lite-android-${{ matrix.variant }}
           if-no-files-found: error
-#          path looks like this: backend/FwLite/artifacts/publish/FwLiteMaui/release_net10.0-android/org.sil.fwlitemaui-signed.apk
-          path: backend/FwLite/artifacts/publish/FwLiteMaui/release_net10.0-android/*
+          # Single-RID (mono) publishes to release_net10.0-android_android-arm; multi-RID
+          # (coreclr) to release_net10.0-android. The trailing * tolerates both.
+          path: backend/FwLite/artifacts/publish/FwLiteMaui/release_net10.0-android*/*
 
   publish-win:
     name: Publish FW Lite app for Windows
@@ -399,17 +419,29 @@ jobs:
           path: fw-lite-web-linux
       - uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
         with:
-          name: fw-lite-android
-          path: fw-lite-android
+          name: fw-lite-android-coreclr
+          path: fw-lite-android-coreclr
+      - uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
+        with:
+          name: fw-lite-android-mono
+          path: fw-lite-android-mono
 
       - name: Zip artifacts
         run: |
           zip -r fw-lite-portable.zip fw-lite-portable
           chmod +x fw-lite-web-linux/*/FwLiteWeb fw-lite-web-linux/*/*.sh
           zip -r fw-lite-web-linux.zip fw-lite-web-linux
-      - name: Rename Installer
+      - name: Rename Installer and stage Android bundles
         run: |
           mv fw-lite-msix/FwLiteMaui.msixbundle fw-lite-msix/FieldWorksLiteInstaller.msixbundle
+          # Both variants share the org.sil.FwLiteMaui basename, so rename per arch before
+          # attaching (release asset names must be unique). Upload BOTH .aab to one Play release.
+          mkdir -p fw-lite-android
+          for v in coreclr mono; do
+            case $v in coreclr) arch=64bit ;; mono) arch=arm32 ;; esac
+            cp fw-lite-android-$v/*.aab fw-lite-android/FieldWorksLite-$arch.aab
+            cp fw-lite-android-$v/*.apk fw-lite-android/FieldWorksLite-$arch.apk 2>/dev/null || true
+          done
 
       - name: Create Release
         uses: softprops/action-gh-release@c95fe1489396fe8a9eb87c0abf8aa5b2ef267fda #v2.2.1
diff --git a/Taskfile.yml b/Taskfile.yml
index 7fb944ce14..8f85a323f7 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -152,3 +152,8 @@ tasks:
     aliases: [android-release-dev]
     desc: Build a Release "Dev" APK and adb-install it on the connected USB device
     deps: [fw-lite:install-maui-android-release-dev]
+
+  fw-lite-android-release-arm32:
+    aliases: [android-release-arm32]
+    desc: Build & install a Release Mono arm32 (armeabi-v7a) APK on the connected USB device
+    deps: [fw-lite:install-maui-android-release-arm32]
diff --git a/backend/FwLite/FwLiteMaui/FwLiteMaui.csproj b/backend/FwLite/FwLiteMaui/FwLiteMaui.csproj
index 69624a297c..ef106a0187 100644
--- a/backend/FwLite/FwLiteMaui/FwLiteMaui.csproj
+++ b/backend/FwLite/FwLiteMaui/FwLiteMaui.csproj
@@ -12,7 +12,11 @@
 		The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
 		either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
     <!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->
-    <RuntimeIdentifiers Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">android-arm;android-arm64;android-x86;android-x64</RuntimeIdentifiers>
+    <!-- CoreCLR (the .NET 10 default Android runtime) is 64-bit only; UseMonoRuntime=true builds the 32-bit
+         armeabi-v7a bundle. Keep RIDs here, not on the command line — a global -p:RuntimeIdentifiers breaks
+         the SDK's per-RID fan-out (dependency projects don't get the singular RID). -->
+    <RuntimeIdentifiers Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android' And '$(UseMonoRuntime)' != 'true'">android-arm64;android-x64</RuntimeIdentifiers>
+    <RuntimeIdentifiers Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android' And '$(UseMonoRuntime)' == 'true'">android-arm</RuntimeIdentifiers>
     <OutputType>Exe</OutputType>
     <RootNamespace>FwLiteMaui</RootNamespace>
     <UseMaui>true</UseMaui>
diff --git a/backend/FwLite/FwLiteMaui/Services/MauiTroubleshootingService.cs b/backend/FwLite/FwLiteMaui/Services/MauiTroubleshootingService.cs
index 685a9bbea4..a3f58daefc 100644
--- a/backend/FwLite/FwLiteMaui/Services/MauiTroubleshootingService.cs
+++ b/backend/FwLite/FwLiteMaui/Services/MauiTroubleshootingService.cs
@@ -22,6 +22,9 @@ public class MauiTroubleshootingService(
     [JSInvokable]
     public Task<bool> GetCanShare() => Task.FromResult(true);
 
+    [JSInvokable]
+    public Task<string> GetProcessArchitecture() => Task.FromResult(RuntimeInfoHelper.ProcessArchitecture());
+
     [JSInvokable]
     public async Task<bool> TryOpenDataDirectory()
     {
diff --git a/backend/FwLite/FwLiteShared/Services/ITroubleshootingService.cs b/backend/FwLite/FwLiteShared/Services/ITroubleshootingService.cs
index 50be6fad49..3a9813af96 100644
--- a/backend/FwLite/FwLiteShared/Services/ITroubleshootingService.cs
+++ b/backend/FwLite/FwLiteShared/Services/ITroubleshootingService.cs
@@ -3,6 +3,7 @@ namespace FwLiteShared.Services;
 public interface ITroubleshootingService
 {
     Task<bool> GetCanShare();
+    Task<string> GetProcessArchitecture();
     Task<bool> TryOpenDataDirectory();
     Task<string> GetDataDirectory();
     Task OpenLogFile();
diff --git a/backend/FwLite/FwLiteShared/Services/RuntimeInfoHelper.cs b/backend/FwLite/FwLiteShared/Services/RuntimeInfoHelper.cs
new file mode 100644
index 0000000000..8ef9a1c6fd
--- /dev/null
+++ b/backend/FwLite/FwLiteShared/Services/RuntimeInfoHelper.cs
@@ -0,0 +1,13 @@
+using System.Runtime.InteropServices;
+
+namespace FwLiteShared.Services;
+
+public static class RuntimeInfoHelper
+{
+    // On Android the process architecture reveals which bundle a device installed (Mono/arm32 vs CoreCLR/64-bit).
+    public static string ProcessArchitecture()
+    {
+        var bits = Environment.Is64BitProcess ? "64-bit" : "32-bit";
+        return $"{RuntimeInformation.ProcessArchitecture} ({bits})";
+    }
+}
diff --git a/backend/FwLite/FwLiteWeb/Services/WebTroubleshootingService.cs b/backend/FwLite/FwLiteWeb/Services/WebTroubleshootingService.cs
index 64bd1ec086..89778108dd 100644
--- a/backend/FwLite/FwLiteWeb/Services/WebTroubleshootingService.cs
+++ b/backend/FwLite/FwLiteWeb/Services/WebTroubleshootingService.cs
@@ -13,6 +13,9 @@ public class WebTroubleshootingService(
     [JSInvokable]
     public Task<bool> GetCanShare() => Task.FromResult(false);
 
+    [JSInvokable]
+    public Task<string> GetProcessArchitecture() => Task.FromResult(RuntimeInfoHelper.ProcessArchitecture());
+
     [JSInvokable]
     public Task<string> GetDataDirectory()
     {
diff --git a/backend/FwLite/Taskfile.yml b/backend/FwLite/Taskfile.yml
index c76a165132..b453f88a9b 100644
--- a/backend/FwLite/Taskfile.yml
+++ b/backend/FwLite/Taskfile.yml
@@ -121,6 +121,14 @@ tasks:
         vars: { FLAVOR: 'Dev' }
       - adb -d install -r bin/Release/net10.0-android/org.sil.FwLiteMaui.dev-Signed.apk
 
+  install-maui-android-release-arm32:
+    # Production builds are 64-bit (CoreCLR); this builds & runs the Mono/armeabi-v7a bundle to test
+    # the 32-bit app on a connected USB device.
+    desc: Build, install & run a Release Mono arm32 (armeabi-v7a) "Dev" APK on the connected USB device
+    dir: ./FwLiteMaui
+    deps: [ ui:build-viewer ]
+    cmd: dotnet build -f net10.0-android -c Release -t:Run -p:FwLiteFlavor=Dev -p:UseMonoRuntime=true -p:RuntimeIdentifiers=android-arm -p:RuntimeIdentifier=android-arm -p:AndroidPackageFormat=apk -p:AdbTarget=-d
+
   build-mini-lcm-sdk:
     desc: Builds the sdk, a zip with the FwLiteWeb server with a project and config to run locally
     dir: ./FwLiteWeb
diff --git a/frontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Services/ITroubleshootingService.ts b/frontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Services/ITroubleshootingService.ts
index 9cd162a39e..566504e172 100644
--- a/frontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Services/ITroubleshootingService.ts
+++ b/frontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Services/ITroubleshootingService.ts
@@ -6,6 +6,7 @@
 export interface ITroubleshootingService
 {
 	getCanShare() : Promise<boolean>;
+	getProcessArchitecture() : Promise<string>;
 	tryOpenDataDirectory() : Promise<boolean>;
 	getDataDirectory() : Promise<string>;
 	openLogFile() : Promise<void>;
diff --git a/frontend/viewer/src/lib/troubleshoot/TroubleshootDialog.svelte b/frontend/viewer/src/lib/troubleshoot/TroubleshootDialog.svelte
index 46c24b702e..7932e62c0d 100644
--- a/frontend/viewer/src/lib/troubleshoot/TroubleshootDialog.svelte
+++ b/frontend/viewer/src/lib/troubleshoot/TroubleshootDialog.svelte
@@ -27,6 +27,7 @@
   const config = useFwLiteConfig();
   let projectCode = $state<string>();
   let canShare = resource(() => service, async (s) => await s?.getCanShare());
+  let architecture = resource(() => service, async (s) => await s?.getProcessArchitecture());
   // Mobile platforms keep app data in private storage that no file manager can open.
   const canOpenDataDirectory = $derived(config.os !== FwLitePlatform.Android && config.os !== FwLitePlatform.iOS);
 
@@ -45,7 +46,7 @@
 
 <ResponsiveDialog bind:open={openQueryParam.current} title={$t`Troubleshoot`} disableBackHandler>
   <div class="flex flex-col gap-4 items-start">
-    <div>
+    <div class="flex flex-col gap-1">
       <p class="flex items-baseline gap-1">
         {$t`FieldWorks Lite version`}:
         <span class="font-semibold border-b">
@@ -54,15 +55,22 @@
         <CopyButton
           variant="ghost"
           size="icon-xs"
+          class="-my-2 self-center"
           iconProps={{class: 'size-4'}}
           title={$t`Copy version`}
-          text={`FieldWorks Lite ${config.appVersion} on ${config.os}`}
+          text={`FieldWorks Lite ${config.appVersion} on ${config.os}${architecture.current ? ` (${architecture.current})` : ''}`}
         />
       </p>
       <p class="flex items-baseline gap-1">
         {$t`Platform`}:
         <span class="font-semibold">{config.os}</span>
       </p>
+      {#if architecture.current}
+        <p class="flex items-baseline gap-1">
+          {$t`Architecture`}:
+          <span class="font-semibold">{architecture.current}</span>
+        </p>
+      {/if}
     </div>
     {#if service && (canOpenDataDirectory || $isDev)}
       <div class="w-full flex flex-col gap-1.5">
diff --git a/frontend/viewer/src/locales/en.po b/frontend/viewer/src/locales/en.po
index 7678587387..436979a58c 100644
--- a/frontend/viewer/src/locales/en.po
+++ b/frontend/viewer/src/locales/en.po
@@ -227,6 +227,10 @@ msgstr "Any semantic domain"
 msgid "Any Ws"
 msgstr "Any Ws"
 
+#: src/lib/troubleshoot/TroubleshootDialog.svelte
+msgid "Architecture"
+msgstr "Architecture"
+
 #. Confirmation prompt
 #: src/lib/entry-editor/DeleteDialog.svelte
 msgid "Are you sure you want to delete {0}?"
diff --git a/frontend/viewer/src/locales/es.po b/frontend/viewer/src/locales/es.po
index 880e5da21e..c822fb0fd5 100644
--- a/frontend/viewer/src/locales/es.po
+++ b/frontend/viewer/src/locales/es.po
@@ -232,6 +232,10 @@ msgstr "Cualquier dominio semántico"
 msgid "Any Ws"
 msgstr "Cualquier W"
 
+#: src/lib/troubleshoot/TroubleshootDialog.svelte
+msgid "Architecture"
+msgstr ""
+
 #. Confirmation prompt
 #: src/lib/entry-editor/DeleteDialog.svelte
 msgid "Are you sure you want to delete {0}?"
diff --git a/frontend/viewer/src/locales/fr.po b/frontend/viewer/src/locales/fr.po
index 485d6334c9..01348581f3 100644
--- a/frontend/viewer/src/locales/fr.po
+++ b/frontend/viewer/src/locales/fr.po
@@ -232,6 +232,10 @@ msgstr "N'importe quel domaine sémantique"
 msgid "Any Ws"
 msgstr "Tous les Systèmes d'Ecriture"
 
+#: src/lib/troubleshoot/TroubleshootDialog.svelte
+msgid "Architecture"
+msgstr ""
+
 #. Confirmation prompt
 #: src/lib/entry-editor/DeleteDialog.svelte
 msgid "Are you sure you want to delete {0}?"
diff --git a/frontend/viewer/src/locales/id.po b/frontend/viewer/src/locales/id.po
index 215f56abd7..065026748a 100644
--- a/frontend/viewer/src/locales/id.po
+++ b/frontend/viewer/src/locales/id.po
@@ -232,6 +232,10 @@ msgstr "Domain semantik apa pun"
 msgid "Any Ws"
 msgstr "Setiap Ws"
 
+#: src/lib/troubleshoot/TroubleshootDialog.svelte
+msgid "Architecture"
+msgstr ""
+
 #. Confirmation prompt
 #: src/lib/entry-editor/DeleteDialog.svelte
 msgid "Are you sure you want to delete {0}?"
diff --git a/frontend/viewer/src/locales/ko.po b/frontend/viewer/src/locales/ko.po
index d84aaca2d1..64f00e437a 100644
--- a/frontend/viewer/src/locales/ko.po
+++ b/frontend/viewer/src/locales/ko.po
@@ -232,6 +232,10 @@ msgstr "모든 시맨틱 도메인"
 msgid "Any Ws"
 msgstr "모든 W"
 
+#: src/lib/troubleshoot/TroubleshootDialog.svelte
+msgid "Architecture"
+msgstr ""
+
 #. Confirmation prompt
 #: src/lib/entry-editor/DeleteDialog.svelte
 msgid "Are you sure you want to delete {0}?"
diff --git a/frontend/viewer/src/locales/ms.po b/frontend/viewer/src/locales/ms.po
index 86edeaa7f4..6389e08d1e 100644
--- a/frontend/viewer/src/locales/ms.po
+++ b/frontend/viewer/src/locales/ms.po
@@ -232,6 +232,10 @@ msgstr "Mana-mana domain semantik"
 msgid "Any Ws"
 msgstr "Mana-mana Ws"
 
+#: src/lib/troubleshoot/TroubleshootDialog.svelte
+msgid "Architecture"
+msgstr ""
+
 #. Confirmation prompt
 #: src/lib/entry-editor/DeleteDialog.svelte
 msgid "Are you sure you want to delete {0}?"
diff --git a/frontend/viewer/src/locales/sw.po b/frontend/viewer/src/locales/sw.po
index ddc5f77608..3dd55a1c44 100644
--- a/frontend/viewer/src/locales/sw.po
+++ b/frontend/viewer/src/locales/sw.po
@@ -232,6 +232,10 @@ msgstr "Kikoa chochote cha kumkutania"
 msgid "Any Ws"
 msgstr "Ws yoyote"
 
+#: src/lib/troubleshoot/TroubleshootDialog.svelte
+msgid "Architecture"
+msgstr ""
+
 #. Confirmation prompt
 #: src/lib/entry-editor/DeleteDialog.svelte
 msgid "Are you sure you want to delete {0}?"
diff --git a/frontend/viewer/src/locales/vi.po b/frontend/viewer/src/locales/vi.po
index 74bb968e9f..fe6ce41142 100644
--- a/frontend/viewer/src/locales/vi.po
+++ b/frontend/viewer/src/locales/vi.po
@@ -232,6 +232,10 @@ msgstr "Bất kỳ miền ngữ nghĩa nào"
 msgid "Any Ws"
 msgstr "Bất kỳ hệ chữ nào"
 
+#: src/lib/troubleshoot/TroubleshootDialog.svelte
+msgid "Architecture"
+msgstr ""
+
 #. Confirmation prompt
 #: src/lib/entry-editor/DeleteDialog.svelte
 msgid "Are you sure you want to delete {0}?"