diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index 0440c67..4e03b15 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -64,6 +64,12 @@ jobs:
           echo "SHORT_SHA=${SHORT_SHA}" >> $GITHUB_ENV
           mv Argyll_V*_${{ matrix.artifact }}.tgz "Argyll_${TAG}_${SHORT_SHA}_${{ matrix.artifact }}.tgz"
           
+      - name: Upload Raw Binaries
+        uses: actions/upload-artifact@v4
+        with:
+          name: raw-bin-${{ matrix.arch }}
+          path: bin/
+          
       - name: Upload Artifact
         uses: actions/upload-artifact@v4
         with:
@@ -77,3 +83,83 @@ jobs:
           name: Release ${{ github.ref_name }}
           body: "Release ${{ github.ref_name }} built from commit ${{ github.sha }}"
           files: Argyll_*_${{ matrix.artifact }}.tgz
+
+  universal:
+    needs: build
+    runs-on: macos-15
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Download x86_64 binaries
+        uses: actions/download-artifact@v4
+        with:
+          name: raw-bin-x86_64
+          path: raw-bin-x86_64
+
+      - name: Download arm64 binaries
+        uses: actions/download-artifact@v4
+        with:
+          name: raw-bin-arm64
+          path: raw-bin-arm64
+
+      - name: Create Universal Binaries
+        run: |
+          mkdir -p bin
+          for file in raw-bin-arm64/*; do
+            bin_name=$(basename "$file")
+            if [ -f "raw-bin-x86_64/$bin_name" ]; then
+              echo "Creating universal binary with lipo: $bin_name"
+              lipo -create "raw-bin-x86_64/$bin_name" "raw-bin-arm64/$bin_name" -output "bin/$bin_name"
+              chmod +x "bin/$bin_name"
+            else
+              echo "Warning: $bin_name not found in raw-bin-x86_64, copying arm64 version"
+              cp "$file" "bin/$bin_name"
+            fi
+          done
+
+      - name: Verify Architecture & Smoke Tests
+        env:
+          ARGYLL_NOT_INTERACTIVE: "1"
+          ARGYLL_EXCLUDE_SERIAL_SCAN: "1"
+        run: |
+          echo "=== Binary Architecture Verification ==="
+          for file in bin/*; do
+            if [ -f "$file" ]; then
+              file "$file"
+            fi
+          done
+          echo "=== Smoke Tests ==="
+          ./bin/dispcal -? || true
+          ./bin/chartread -? || true
+          ./bin/colprof -? || true
+          ./bin/targen -? || true
+
+      - name: Package Universal Release
+        run: |
+          export OSTYPE=darwin
+          export MACHTYPE=universal-apple-darwin
+          export HOSTTYPE=universal
+          export NO_BUILD=1
+          ./makepackagebin.sh
+          TAG="${{ github.ref_name }}"
+          SHORT_SHA="$(git rev-parse --short HEAD)"
+          echo "SHORT_SHA=${SHORT_SHA}" >> $GITHUB_ENV
+          mv Argyll_V*_macOS_universal_bin.tgz "Argyll_${TAG}_${SHORT_SHA}_macOS_universal_bin.tgz"
+
+      - name: Upload Universal Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: Argyll_${{ github.ref_name }}_${{ env.SHORT_SHA }}_macOS_universal_bin
+          path: Argyll_*_macOS_universal_bin.tgz
+
+      - name: Upload Universal Release Asset
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v2
+        with:
+          name: Release ${{ github.ref_name }}
+          body: "Release ${{ github.ref_name }} built from commit ${{ github.sha }}"
+          files: Argyll_*_macOS_universal_bin.tgz
diff --git a/doc/ChangesSummary.html b/doc/ChangesSummary.html
index b5b5bbc..a4122bb 100755
--- a/doc/ChangesSummary.html
+++ b/doc/ChangesSummary.html
@@ -19,6 +19,7 @@
     <h1>[V3.4.1 -&gt; V3.5.0] 4th February 2026<br>
     </h1>
     <ul>
+      <li>Added macOS Universal Binary release archive (Intel x86_64 + Apple Silicon arm64).</li>
       <li>Fixed non-blocking stdin polling deadlock on MSWindows anonymous pipes when running interactive measurement tools in subprocess mode.</li>
       <li>Added -d switch to printtarg to allow custom chart label strings or omit labelling entirely.</li>
       <li>Added MSWindows ARM release.</li>
diff --git a/makepackagebin.sh b/makepackagebin.sh
index f7beac1..0a75e65 100755
--- a/makepackagebin.sh
+++ b/makepackagebin.sh
@@ -113,6 +113,13 @@ else if [ "${OSTYPE#*darwin*}" != "$OSTYPE" ] ; then
 		echo "We're on MacOS arm64!"
 		PACKAGE=${PRODUCT}_V${VERSION}_macOS_arm64_bin.tgz
 		export MACOSX_DEPLOYMENT_TARGET="11.0"	# Minimum target platform version
+	else if [ X$HOSTTYPE = "Xuniversal" \
+		  -o X$MACHTYPE = "Xuniversal-apple-darwin" \
+		  -o X$COMPILER = "XUNIVERSAL" ] ; then
+		echo "We're on MacOS Universal!"
+		PACKAGE=${PRODUCT}_V${VERSION}_macOS_universal_bin.tgz
+		export MACOSX_DEPLOYMENT_TARGET="10.15"	# Minimum target platform version
+	fi
 	fi
 	fi
 	fi
@@ -145,23 +152,25 @@ fi
 
 echo "Making GNU $PRODUCT binary distribution $PACKAGE for Version $VERSION"
 
-# Clean up so we get a solid build
-# .sp come from profile, .cht from scanin and .ti3 from spectro
-rm -f bin/*.exe bin/*.dll
-rm -f ref/*.sp ref/*.cht ref/*.ti2
+if [ X$NO_BUILD = "X" ] ; then
+	# Clean up so we get a solid build
+	# .sp come from profile, .cht from scanin and .ti3 from spectro
+	rm -f bin/*.exe bin/*.dll
+	rm -f ref/*.sp ref/*.cht ref/*.ti2
 
-if [ X$CROSS_COMPILE = "X" ] ; then		# If not cross compiling
-  echo "Cleaning before build ..."
-  if ! jam -fJambase -sBUILTIN_TIFF=true -sBUILTIN_JPEG=true -sBUILTIN_PNG=true -sBUILTIN_Z=true -sBUILTIN_SSL=true clean ; then
-    	echo "Clean failed!"
-  	exit 1
-  fi 
-fi
+	if [ X$CROSS_COMPILE = "X" ] ; then		# If not cross compiling
+	  echo "Cleaning before build ..."
+	  if ! jam -fJambase -sBUILTIN_TIFF=true -sBUILTIN_JPEG=true -sBUILTIN_PNG=true -sBUILTIN_Z=true -sBUILTIN_SSL=true clean ; then
+	    	echo "Clean failed!"
+	  	exit 1
+	  fi 
+	fi
 
-# Make sure it's built and installed
-if ! jam -q -fJambase -j${NUMBER_OF_PROCESSORS:-1} -sBUILTIN_TIFF=true -sBUILTIN_JPEG=true -sBUILTIN_PNG=true -sBUILTIN_Z=true -sBUILTIN_SSL=true install ; then
-	echo "Build failed!"
-	exit 1
+	# Make sure it's built and installed
+	if ! jam -q -fJambase -j${NUMBER_OF_PROCESSORS:-1} -sBUILTIN_TIFF=true -sBUILTIN_JPEG=true -sBUILTIN_PNG=true -sBUILTIN_Z=true -sBUILTIN_SSL=true install ; then
+		echo "Build failed!"
+		exit 1
+	fi 
 fi 
 
 rm -rf $TOPDIR