diff --git a/.github/workflows/test-appimage-native.yml b/.github/workflows/test-appimage-native.yml
new file mode 100644
index 00000000..8f80cee4
--- /dev/null
+++ b/.github/workflows/test-appimage-native.yml
@@ -0,0 +1,69 @@
+name: Native Monitor AppImage validation
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/test-appimage-native.yml'
+      - 'AppImage/scripts/build_appimage.sh'
+      - 'AppImage/scripts/appimage_arch.sh'
+      - 'AppImage/scripts/AppRun'
+      - 'tests/test_appimage_arch.py'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: native-appimage-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  native-build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: ubuntu-22.04
+            arch: x86_64
+          - runner: ubuntu-22.04-arm
+            arch: aarch64
+    runs-on: ${{ matrix.runner }}
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Validate native architecture selection
+        run: |
+          test "$(uname -m)" = '${{ matrix.arch }}'
+          python -B -m unittest discover -s tests -p test_appimage_arch.py -v
+      - name: Refresh package indexes for bundled monitoring tools
+        run: sudo apt-get update
+      - name: Build native AppImage without publishing it
+        run: bash AppImage/scripts/build_appimage.sh
+      - name: Extract native AppImage without FUSE
+        run: |
+          mkdir /tmp/proxmenux-native-extract
+          cd /tmp/proxmenux-native-extract
+          image=$(find "$GITHUB_WORKSPACE/AppImage/dist" -name '*.AppImage' -type f -print -quit)
+          test -n "$image"
+          chmod +x "$image"
+          "$image" --appimage-extract
+          test -f squashfs-root/usr/bin/flask_server.py
+          test -f squashfs-root/usr/bin/appimage_arch.sh
+          test -f squashfs-root/web/index.html
+      - name: Import bundled Python 3.11 native WebSocket runtime
+        env:
+          PYTHONPATH: /tmp/proxmenux-native-extract/squashfs-root/usr/lib/python3/vendor/cp311:/tmp/proxmenux-native-extract/squashfs-root/usr/lib/python3/dist-packages
+        run: python -c 'import gevent, greenlet, geventwebsocket, zope.interface; from PIL import Image; from gevent import pywsgi; print(gevent.__version__)'
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+      - name: Import bundled Python 3.13 native WebSocket runtime
+        env:
+          PYTHONPATH: /tmp/proxmenux-native-extract/squashfs-root/usr/lib/python3/vendor/cp313:/tmp/proxmenux-native-extract/squashfs-root/usr/lib/python3/dist-packages
+        run: python -c 'import gevent, greenlet, geventwebsocket, zope.interface; from PIL import Image; from gevent import pywsgi; print(gevent.__version__)'
diff --git a/AppImage/scripts/AppRun b/AppImage/scripts/AppRun
index 74ad4d22..db6e2b6b 100644
--- a/AppImage/scripts/AppRun
+++ b/AppImage/scripts/AppRun
@@ -6,8 +6,11 @@
 # Get the directory where this AppImage is mounted
 APPDIR="$(dirname "$(readlink -f "${0}")")"
 
+source "${APPDIR}/usr/bin/appimage_arch.sh" || exit 1
+pmx_appimage_arch "$(uname -m)" || exit 1
+
 export PATH="${APPDIR}/usr/bin:${PATH}"
-export LD_LIBRARY_PATH="${APPDIR}/usr/lib/x86_64-linux-gnu:${APPDIR}/usr/lib:${APPDIR}/lib/x86_64-linux-gnu:${APPDIR}/lib:${LD_LIBRARY_PATH}"
+export LD_LIBRARY_PATH="${APPDIR}/usr/lib/${PMX_APPIMAGE_TRIPLET}:${APPDIR}/usr/lib:${APPDIR}/lib/${PMX_APPIMAGE_TRIPLET}:${APPDIR}/lib:${LD_LIBRARY_PATH}"
 
 # Select the native dependency tree matching the host interpreter.  PVE 8
 # uses CPython 3.11 and PVE 9 uses CPython 3.13; both runtimes are bundled in
diff --git a/AppImage/scripts/appimage_arch.sh b/AppImage/scripts/appimage_arch.sh
new file mode 100644
index 00000000..ef7b9f84
--- /dev/null
+++ b/AppImage/scripts/appimage_arch.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+# Shared native build/runtime architecture names. No emulated cross-builds.
+pmx_appimage_arch() {
+    case "$1" in
+        x86_64|amd64)
+            PMX_APPIMAGE_ARCH=x86_64
+            PMX_APPIMAGE_TRIPLET=x86_64-linux-gnu
+            PMX_APPIMAGE_SUFFIX=""
+            ;;
+        aarch64|arm64)
+            PMX_APPIMAGE_ARCH=aarch64
+            PMX_APPIMAGE_TRIPLET=aarch64-linux-gnu
+            PMX_APPIMAGE_SUFFIX=-aarch64
+            ;;
+        *)
+            echo "Unsupported Monitor AppImage architecture: $1" >&2
+            return 1
+            ;;
+    esac
+}
diff --git a/AppImage/scripts/build_appimage.sh b/AppImage/scripts/build_appimage.sh
index 3ccf3d66..ecc7ae0c 100755
--- a/AppImage/scripts/build_appimage.sh
+++ b/AppImage/scripts/build_appimage.sh
@@ -8,6 +8,8 @@ set -e
 WORK_DIR="/tmp/proxmenux_build"
 APP_DIR="$WORK_DIR/ProxMenux.AppDir"
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/appimage_arch.sh"
+pmx_appimage_arch "$(uname -m)" || exit 1
 DIST_DIR="$SCRIPT_DIR/../dist"
 APPIMAGE_ROOT="$SCRIPT_DIR/.."
 
@@ -24,7 +26,7 @@ ZOPE_EVENT_VERSION="6.2"
 GEVENT_WEBSOCKET_VERSION="0.10.1"
 
 VERSION=$(node -p "require('$APPIMAGE_ROOT/package.json').version")
-APPIMAGE_NAME="ProxMenux-${VERSION}.AppImage"
+APPIMAGE_NAME="ProxMenux-${VERSION}${PMX_APPIMAGE_SUFFIX}.AppImage"
 
 echo "🚀 Building ProxMenux Monitor AppImage v${VERSION} with hardware monitoring tools..."
 
@@ -33,16 +35,9 @@ echo "🚀 Building ProxMenux Monitor AppImage v${VERSION} with hardware monitor
 # under the non-root GitHub Actions runner — previously hardcoded to
 # /var/cache/, which the CI user can't write to (mkdir Permission
 # denied → build aborted before doing any actual work).
-APPIMAGETOOL_CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/proxmenux-build/appimagetool"
+APPIMAGETOOL_CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/proxmenux-build/appimagetool-${PMX_APPIMAGE_ARCH}"
 
-# Preserve a cached copy of appimagetool across builds. wget -q has bitten
-# us repeatedly when GitHub momentarily rate-limits or the runner has no
-# network — the result is a 0-byte file that passes the `[ -f ]` check on
-# the next run and breaks the build silently.
-if [ -f "$WORK_DIR/appimagetool" ] && [ -s "$WORK_DIR/appimagetool" ]; then
-    mkdir -p "$(dirname "$APPIMAGETOOL_CACHE")"
-    cp -f "$WORK_DIR/appimagetool" "$APPIMAGETOOL_CACHE"
-fi
+# Architecture-specific caches never reuse an executable from a different CPU.
 
 # Clean and create work directory
 rm -rf "$WORK_DIR"
@@ -57,7 +52,7 @@ if [ -s "$APPIMAGETOOL_CACHE" ]; then
 fi
 if [ ! -s "$WORK_DIR/appimagetool" ]; then
     echo "📥 Downloading appimagetool..."
-    wget --tries=3 --timeout=60 "https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage" -O "$WORK_DIR/appimagetool" || true
+    wget --tries=3 --timeout=60 "https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-${PMX_APPIMAGE_ARCH}.AppImage" -O "$WORK_DIR/appimagetool" || true
     if [ ! -s "$WORK_DIR/appimagetool" ]; then
         echo "❌ Failed to download appimagetool" >&2
         exit 1
@@ -310,6 +305,7 @@ fi
 echo "📋 Copying AppRun script..."
 if [ -f "$SCRIPT_DIR/AppRun" ]; then
     cp "$SCRIPT_DIR/AppRun" "$APP_DIR/AppRun"
+    cp "$SCRIPT_DIR/appimage_arch.sh" "$APP_DIR/usr/bin/appimage_arch.sh"
     chmod +x "$APP_DIR/AppRun"
     echo "✅ AppRun script copied successfully"
 else
@@ -379,7 +375,7 @@ pip3 install --target "$APP_DIR/usr/lib/python3/dist-packages" --upgrade \
 # Phase 3b: Install the complete gevent/WSS runtime separately for every
 # supported host ABI.  Keeping each dependency tree isolated avoids mixing
 # CPython-specific modules from the build runner with those loaded by PVE.
-# The two --platform values allow gevent's manylinux_2_28 wheels and the
+# The three --platform values allow gevent's manylinux_2_28 wheels and the
 # backwards-compatible manylinux2014 zope.interface wheels to be resolved in
 # one deterministic installation.
 install_gevent_runtime() {
@@ -394,9 +390,9 @@ install_gevent_runtime() {
         --target "$target" \
         --upgrade \
         --only-binary=:all: \
-        --platform manylinux_2_28_x86_64 \
-        --platform manylinux_2_27_x86_64 \
-        --platform manylinux2014_x86_64 \
+        --platform "manylinux_2_28_${PMX_APPIMAGE_ARCH}" \
+        --platform "manylinux_2_27_${PMX_APPIMAGE_ARCH}" \
+        --platform "manylinux2014_${PMX_APPIMAGE_ARCH}" \
         --implementation cp \
         --python-version "$python_version" \
         --abi "$abi" \
@@ -547,7 +543,7 @@ if [ -d "$APP_DIR/bin" ]; then
 fi
 
 echo "🔍 Sanity check (ldd + presence of libfreeipmi)"
-export LD_LIBRARY_PATH="$APP_DIR/lib:$APP_DIR/lib/x86_64-linux-gnu:$APP_DIR/usr/lib:$APP_DIR/usr/lib/x86_64-linux-gnu"
+export LD_LIBRARY_PATH="$APP_DIR/lib:$APP_DIR/lib/${PMX_APPIMAGE_TRIPLET}:$APP_DIR/usr/lib:$APP_DIR/usr/lib/${PMX_APPIMAGE_TRIPLET}"
 
 if ! find "$APP_DIR/usr/lib" "$APP_DIR/lib" -maxdepth 3 -name 'libfreeipmi.so.17*' | grep -q .; then
   echo "❌ libfreeipmi.so.17 not found inside AppDir (ipmitool will fail)"
@@ -608,7 +604,7 @@ echo "🔨 Building unified AppImage v${VERSION}..."
 cd "$WORK_DIR"
 export NO_CLEANUP=1
 export APPIMAGE_EXTRACT_AND_RUN=1
-ARCH=x86_64 ./appimagetool --no-appstream --verbose "$APP_DIR" "$APPIMAGE_NAME"
+ARCH="$PMX_APPIMAGE_ARCH" ./appimagetool --no-appstream --verbose "$APP_DIR" "$APPIMAGE_NAME"
 
 # Move to dist directory
 mv "$APPIMAGE_NAME" "$DIST_DIR/"
diff --git a/docs/monitor-native-builds.md b/docs/monitor-native-builds.md
new file mode 100644
index 00000000..feade22e
--- /dev/null
+++ b/docs/monitor-native-builds.md
@@ -0,0 +1,23 @@
+# Native Monitor AppImage builds
+
+The builder selects its native architecture using `uname -m`. Supported targets
+are x86_64 and aarch64 (ARM64). It selects matching appimagetool executables,
+separate download caches, manylinux wheels and GNU library paths. Cross-building
+by overriding a target variable is intentionally unsupported: APT packages and
+other native Python dependencies must also match the build machine.
+
+Run `bash AppImage/scripts/build_appimage.sh` on a Linux builder with Node.js,
+Python/pip, APT and the usual AppImage build dependencies. AMD64 keeps the existing
+`ProxMenux-VERSION.AppImage` name; ARM64 produces
+`ProxMenux-VERSION-aarch64.AppImage`.
+
+The native validation workflow builds both architectures on GitHub's native
+Ubuntu 22.04 runners, extracts each AppImage without FUSE, and imports its bundled
+CPython 3.11 and 3.13 WebSocket/image runtimes. It does not upload artifacts,
+change release assets, or modify an installed Monitor.
+
+This build lane is a prerequisite for ARM distribution, not a declaration of
+PXVIRT or Raspberry Pi hardware compatibility. ARM release/checksum publication,
+installer selection and validation on the maintainer's PXVIRT lab remain separate
+steps before ARM installations can use a published image. The current release
+and installer distribution remain unchanged.
diff --git a/tests/test_appimage_arch.py b/tests/test_appimage_arch.py
new file mode 100644
index 00000000..0678b3a5
--- /dev/null
+++ b/tests/test_appimage_arch.py
@@ -0,0 +1,77 @@
+"""Exercise native architecture wiring without building or changing the host."""
+import json
+import os
+from pathlib import Path
+import shutil
+import subprocess
+import tempfile
+import unittest
+
+ROOT = Path(__file__).resolve().parents[1]
+SCRIPTS = ROOT / 'AppImage/scripts'
+
+
+class AppImageArchitectureTests(unittest.TestCase):
+    def configure(self, machine):
+        return subprocess.run(['bash', '-c',
+            'source "$1"; pmx_appimage_arch "$2" || exit; '
+            'printf "%s|%s|%s" "$PMX_APPIMAGE_ARCH" "$PMX_APPIMAGE_TRIPLET" "$PMX_APPIMAGE_SUFFIX"',
+            'fixture', str(SCRIPTS / 'appimage_arch.sh'), machine], capture_output=True, text=True)
+
+    def test_supported_native_architectures_and_aliases(self):
+        for machine in ['x86_64', 'amd64']:
+            self.assertEqual(self.configure(machine).stdout, 'x86_64|x86_64-linux-gnu|')
+        for machine in ['aarch64', 'arm64']:
+            self.assertEqual(self.configure(machine).stdout, 'aarch64|aarch64-linux-gnu|-aarch64')
+
+    def test_unsupported_architecture_fails_before_build_side_effects(self):
+        with tempfile.TemporaryDirectory() as folder:
+            binary = Path(folder) / 'uname'
+            binary.write_text('#!/bin/sh\necho loongarch64\n')
+            binary.chmod(0o755)
+            result = subprocess.run(['bash', str(SCRIPTS / 'build_appimage.sh')],
+                env={**os.environ, 'PATH': folder + ':' + os.environ['PATH']}, capture_output=True, text=True)
+        self.assertNotEqual(result.returncode, 0)
+        self.assertIn('Unsupported Monitor AppImage architecture: loongarch64', result.stderr)
+        self.assertNotIn('Building ProxMenux', result.stdout)
+
+    def test_gevent_wheel_installer_uses_native_platform_for_both_abis(self):
+        source = (SCRIPTS / 'build_appimage.sh').read_text()
+        function = source[source.index('install_gevent_runtime() {'):source.index('\ninstall_gevent_runtime "3.11"')]
+        for machine in ['x86_64', 'aarch64']:
+            with tempfile.TemporaryDirectory() as folder:
+                command = ('source "$1"; pmx_appimage_arch "$2"; APP_DIR="$3"; '
+                           'python3() { printf "%s\\n" "$*"; }; ' + function +
+                           '\ninstall_gevent_runtime 3.11 cp311\ninstall_gevent_runtime 3.13 cp313')
+                result = subprocess.run(['bash', '-c', command, 'fixture', str(SCRIPTS / 'appimage_arch.sh'), machine, folder],
+                                        capture_output=True, text=True, check=True)
+            for platform in ['manylinux_2_28_', 'manylinux_2_27_', 'manylinux2014_']:
+                self.assertEqual(result.stdout.count('--platform ' + platform + machine), 2)
+            for abi in ['cp311', 'cp313']:
+                self.assertIn('--abi ' + abi, result.stdout)
+
+    def test_apprun_uses_native_library_paths_and_matching_host_python_tree(self):
+        for machine in ['x86_64', 'aarch64']:
+            with tempfile.TemporaryDirectory() as folder:
+                app = Path(folder)
+                (app / 'usr/bin').mkdir(parents=True)
+                (app / 'usr/lib/python3/vendor/cp311').mkdir(parents=True)
+                shutil.copy(SCRIPTS / 'appimage_arch.sh', app / 'usr/bin')
+                shutil.copy(SCRIPTS / 'AppRun', app / 'AppRun')
+                for name, body in {
+                    'uname': 'echo ' + machine,
+                    'readlink': 'printf "%s\\n" "$2"',
+                    'python3': 'if [ "$1" = -c ]; then echo cp311; else printf "LIB=%s\\nPY=%s\\n" "$LD_LIBRARY_PATH" "$PYTHONPATH"; fi',
+                }.items():
+                    file = app / 'usr/bin' / name
+                    file.write_text('#!/bin/sh\n' + body + '\n')
+                    file.chmod(0o755)
+                result = subprocess.run(['bash', str(app / 'AppRun'), '--translate'],
+                    env={**os.environ, 'PATH': str(app / 'usr/bin') + ':' + os.environ['PATH']},
+                    capture_output=True, text=True, check=True)
+                self.assertIn(str(app / ('usr/lib/' + machine + '-linux-gnu')), result.stdout)
+                self.assertIn(str(app / 'usr/lib/python3/vendor/cp311'), result.stdout)
+
+
+if __name__ == '__main__':
+    unittest.main()